MODEL: S1G-100-LEL and S2G-100-LEL with PE1100

UNI-TROL GAS CONTROLLER™

Single-Channel Field Mount Controller with LEL Sensor

REVISED: MAY, 1998

WARRANTY POLICY

The products of Net Safety Monitoring Inc, are carefully designed and manufactured from high

quality components and can be expected to provide many years of trouble free service. Each

product is thoroughly tested, inspected and burned-in prior to shipment. Failures can occur which

are beyond the control of the manufacturer. Failures can be minimized by adhering to the

operating and maintenance instructions herein. W here the absolute greatest of reliability is

required, redundancy should be designed into the system.

Net Safety Monitoring Inc, warrants its sensors and detectors against defective parts and

workmanship for a period of 24 months from date of purchase and other electronic assemblies for

36 months from date of purchase.

No other warranties or liability, expressed or implied, will be honoured by Net Safety

Monitoring Inc.

Contact Net Safety Monitoring Inc. or the authorized distributor for details.

Table of Contents

Unit I - GENERAL INFORMATIONDESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

FEATURES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Figure 1 - Controller Dimensions in Inches . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

Figure 2 - Controller Front Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

BASIC OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

FACEPLATE DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

OUTPUTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

RELAY OUTPUTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

RECOMMENDATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

CURRENT OUTPUTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Figure 3 - Jumper Selections For Isolated or Non-Isolated Current Output . . . . . . . . . . . 4

Table 1 - Current Outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

PROGRAMMING OPTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Table 2 - Selectable Output Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

EXTERNAL RESET . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

AUTOMATIC DIAGNOSTICS AND FAULT IDENTIFICATION . . . . . . . . . . . . . . . . . . . . 5

OPERATING MODES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

NORMAL OPERATING MODE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

RESET MODE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

FORCED RESET MODE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

SENSOR REPLACEMENT MODE(SrP) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

SENSOR CALIBRATION MODE(CAL) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

SET-POINT DISPLAY (Spd) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

ADDRESS SET (Adr Set) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

ERROR MESSAGE DISPLAY (ErrChc) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

UNIT II - GENERAL INFORMATION (SENSOR) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

FEATURES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Figure 4 - Sensor and Transmitter Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

LOW ER EXPLOSIVE LIMIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Table 3 - Flammable Gas Volume for 100% LEL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

OPERATIONS OVERVIEW . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Table 4 - K Factor for Various Gases . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

UNIT III - GENERAL INFORMATION (SENSOR)

INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

SENSOR LOCATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

GENERAL W IRING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

CONTROLLER W IRING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Figure 5a - Wiring for S1G with Non-Isolated Current Output . . . . . . . . . . . . . . . . . . . . 14

Figure 5b - Wiring for S1G With Isolated Current Output . . . . . . . . . . . . . . . . . . . . . . . . 15

Figure 6a - Wiring for S2G with Non-Isolated Output . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Figure 6b - Wiring for S2G With Isolated Current Output . . . . . . . . . . . . . . . . . . . . . . . . 17

DIP SW ITCH SETTINGS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Figure 7a - Dip Switch Position . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Figure 7b - Dip Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

ACTIVE CHANNELS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

CALIBRATION GAS CONCENTRATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

POW ER-UP TIME DELAY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

ALARM SETTINGS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

LATCHING/NON-LATCHING SELECTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

Table of Contents (Cont)

ENERGIZED/DE-ENERGIZED SELECTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

RELAY SETTINGS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

Figure 9a - Relay Positions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

Figure 9b - Relay Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

Table 5 - Summary of Dip Switch Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

UNIT IV - SYSTEM OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

MENU AND FUNCTION SELECTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

Table 6a - Menu and Function Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

Table 6b - Main Menu Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

Table 7 - Special Function Menu Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

START-UP PROCEDURE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

MAIN MENU SELECTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

ERROR CHECK MODE(ERR CHC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

SET-POINT DISPLAY MODE (SPd) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

Table 8 - System Status Codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

SENSOR CALIBRATION (CAL) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

GENERAL INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

CALIBRATION PROCEDURE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

SENSOR REPLACEMENT MODE (SrP) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

SPECIAL FUNCTION MENU SELECTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

FORCED CURRENT OUTPUTS (FoP) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

CURRENT CALIBRATION MODE (CuC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

ADDRESS MODE (Adr Set) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

CHANNEL DISPLAY (Chd) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

BYPASS (bPS) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

OPERATING MODES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

RESET MODE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

FORCED RESET MODE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

NORMAL OPERATING MODE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

FORCED DISPLAY (FdP) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

UNIT V - SYSTEM MAINTENANCEROUTINE MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

MANUAL CHECK OF OUTPUT DEVICES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

SYSTEM CHECK IN NORMAL MODE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

SENSOR REPLACEMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

REPLACEMENT PARTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

DEVICE REPAIR AND RETURN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

Table 10 - Troubleshooting Guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

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Unit IGENERAL INFORMATION (CONTROLLER)

DESCRIPTION

TheS1G and S2G Uni-Trol Controller accepts input directly from PE1100 combustible gas™

sensors. The controller is designed to accept the millivolt signal from the SC1100 LEL sensor

without the need for a transmitter to change the signal to a 4-20mA current signal. Controller

response includes actuation of relays for direct control of field response devices, 4-20mA DC

current output and, a full array of faceplate indicators.

FEATURES

< Controller accepts millivolt inputs (PE1100 LEL sensor).

< Two digital displays, one bar graph display, and high intensity LEDs indicate important

system status information.

< AutoCal feature provides easy and accurate calibration.

< Microprocessor-based controller is easily field programmable.

< 4-20mA current output send important system information to other devices.

< Relay alarm and fault outputs.

SPECIFICATIONS

< Operating Voltage:

24 Volts DC. Device can operate between 18 and 32 Volts DC

< Power Consumption (Controller Only):

3.0 W atts nominal, 5.2 W atts maximum (125 mA nominal, 215 mA maximum at

24 Volts DC).

Maximum startup current is 1.0 Amperes for 5 seconds. Power supplies with fold

back current limiting are not recommended

< Maximum Ripple:

Ripple should not exceed 5 Volts peak-to-peak. The sum of DC plus ripple must

be $18 Volts DC and #32 Volts DC.

< Temperature Range:

Operating: -40ºC to +85ºC (-40ºF to +185ºF)

Storage: -55ºC to +150ºC (-65ºF to +302ºF)

< Relay Contacts:

Form C normally open/normally closed contacts rated for 5 Amperes at 30 Volts

DC/ 250 Volts AC

< Current Outputs:

One 4-20mA DC current, with a maximum external loop resistance of 600S at 18-

32 Volts DC.

< Dimensions:

Refer to Figure 1

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< Shipping Weight (Approximate):

6 lbs. (2.7 kilograms)

< Certification:

CSA certified for hazardous locations, Class 1, Division 1, Groups B, C, and D.

Figure 1 - Controller Dimensions in Inches Figure 2 - Controller Front Panel

BASIC OPERATION

FACEPLATE DESCRIPTION

The controller faceplate provides LEDs for identifying status conditions, two digital displays and a

bar graph display for indicating the sensor input, and magnetically activated MENU/SET and

SELECT/RESET reed switches (see the appendix for activation instructions) for programming,

calibrating and resetting the system. Refer to Figure 2 for the location of indicators and switches.

< Digital Displays - Two digital displays are used to display the sensor input in both the

Normal and Calibrate Modes; one display indicates the channel and one display indicates

the corresponding sensor input. In the event of a fault, it identifies the nature of the fault

using an alphanumeric code. In the Normal Operating Mode the gas concentration at the

sensor is shown. In other operating modes, the digital displays show the alarm set-points,

programmed calibration gas concentration, output current, or the communication

addresses for the CAN interface. A negative zero drift condition is indicated by a minus

sign in the left-hand digit. Since at least one display is always lit, they also function as a

power indicator.

< Bar Graph Display - The common 10-segment bar graph display provides readings of

the sensor input in 5% LEL increments, from 0% to 50% LEL; all 10 segments are

illuminated when 50% LEL is exceeded.

< High Alarm LED (HI) - Flashes in response to a sensor signal that exceeds the high

alarm set-point.

< Low Alarm LED (LOW) - Flashes in response to a sensor signal that exceeds the low

alarm set-point.

< Calibrate LED (CAL) - is illuminated while the controller is in the Calibration Mode.

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< Fault LED (Fault) - is illuminated upon detection of an overall system fault or a channel

related fault.

< Channel LEDs - are illuminated when status on the corresponding channel is displayed

on the common indicators (digital displays and bar graph). During power-up, a channel

LED is on if the channel is selected for operation.

< MENU/SET Reed Switch - is used for changing the menu display resetting the controller

calibration and other system programming and calibration functions.

< SELECT/RESET Reed Switch - is used for menu selection, and other system

programming, for resetting the controller.

OUTPUTS

Relay Outputs:

The relay outputs have SPDT contacts rated for 5 Amperes at 30 Volts DC or 250 Volts AC. The

four relays include an Area 1 low alarm (channel 1), an Area 2 low alarm (channel 2) one common

high alarm, and fault alarm.

RECOMMENDATION

The fault relay output should not be used to activate an automatic shutdown procedure.

The fault output indicates a potential problem with the controller, not an alarm condition.

Current Outputs:

Two 4-20mA DC current output for transmitting system information to other devices are also

included. The current outputs can be wired for isolated or non-isolated operation by changing the

jumpers as shown in Figure 3. Refer to Table 1 for a description of the current output signal

levels.

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Figure 3 - Jumper Selections For Isolated or

Non-isolated Current Output

Current Output Situation

0mA Open or shorted signal output, or loss of power

1mA Fault or Power-Up

2mA Power Fault

3mA Calibration

4mA to 20mA 0 to 100% LEL gas concentration

Table 1 - Current Outputs

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PROGRAMMING OPTIONS

A set of dip-switches, located on the circuit board, can be used to “program” various options and

set-points, including:

< channels selected for operation,

< low and high alarm settings,

< calibration gas concentration,

< power-up delay time (either 45 or 90 seconds),

< latching / non-latching relay action

< energized / de-energized relay action

The alarm relays are programmable for either normally energized or normally de-energized

operation (programmable as a group only, not individually). The fault relay is normally energized.

The low alarm relays are programmable for either latching or non-latching operation. The high

alarm relay is always latching and the fault relay is non-latching. Refer to Table 2.

Jumper selections are provided for normally open or normally closed relay outputs and for isolated

or non-isolated current outputs.

OUTPUT

Selectable Normally

Open/Closed

Selectable Normally

Energized/De-Energized

Selectable

Latching/Non-latching

LOW Y Y Y1 2

HIGH Y Y N2 3

FAULT Y N N4 5

Table 2 - Selectable Output Options

1 Low alarms are programed together, not individually

Programmable together, not individually2

High alarm relay is always latching3

Fault relay is normally energized4

Fault relay is non-latching5

EXTERNAL RESET

A normally open, momentary closure switch can be connected between the external reset terminal

and the negative power terminal to provide remote reset capabilities.

AUTOMATIC DIAGNOSTICS AND FAULT IDENTIFICATION

The microprocessor-based controller features self-testing circuitry that continuously checks for

problems that could prevent proper system response. W hen power is applied, the microprocessor

automatically tests memory. In the Normal Operating Mode, it continuously monitors the input

signals from the sensor to ensure proper functioning. In addition, a "watchdog" timer is maintained

to ensure that the program is running correctly. The timer resets the micro-controller if it enters

erroneous processor states within a reasonable period of time.

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If a fault is detected, the Fault LED illuminates, the digital display identifies that a fault has

occurred, the fault relay output becomes de-energized, and the current output drops to less than 1

mA.

The nature of the fault can be identified by a numeric code, which can be viewed in the Fault

Message Display mode.

OPERATING MODES

The controller can operate in any of the modes discussed in this section. Operating modes other

than Normal are selected by activating the appropriate MENU/SET and SELECT/RESET switches

located on the controller front panel. Refer to Figure 2 for a diagram of the controller front panel.

NOTE

This section is intended to acquaint the user with the basic operation of the controller.

Refer to “Unit III” for detailed instructions and description.

Normal Operating Mode:

If no alarms or faults are present, the Module will be in a Level 1 Display Mode; the bar graph and

digital display indicate the sensor inputs. Relay outputs are in their normal state, and the current

output corresponds to the sensor input.

If a low alarm condition occurs, the controller will be in a Level 2 Display Mode; the bar graph and

digital display will display the gas concentration at the sensor. The low alarm LED will flash, the

low alarm relay changes state, and the current output changes to indicate the alarm. If the signal

decreases below the low set-point again, the low alarm relay returns to its normal state if

programmed for non-latching operation and remains unchanged if programmed for latching

operation. The current output returns to normal. The low alarm LED will remain illuminated, but

will no longer flash.

If a high alarm condition occurs, the module will be in a Level 3 Display Mode; the bar graph and

digital display will display the gas concentration at the sensor and the high alarm LED will flash.

Reset Mode:

The system is reset by activating the SELECT/RESET switch located on the front panel of the

controller. (Refer to Figure 2) W hen the SELECT/RESET switch is activated momentarily, all

outputs return to their normal condition if no alarms or faults are present. (basic reset).

Forced Reset Mode:

If the controller receives a signal beyond 100% LEL from the sensor, a reset will not clear the

alarms, even if the channel has returned to levels below the low alarm set point. The error

resulting from this occurrence must be cleared and a forced reset applied. To apply a forced

reset, activate the SELECT/RESET switch for 1 second, the LEDs turn off and the outputs return

to their normal condition. The remote reset performs a forced reset.

NOTE

The remote reset performs a reset function only. It cannot be used for other controller

functions.

Sensor Replacement Mode (SrP):

This mode inhibits all controller outputs to allow replacement of the sensor without removing

power from the controller. Alarm set-points and calibration gas concentration are not affected.

The left display will show ‘SrP’ while in the sensor replace mode. The right display will show the

status of the sensor being replaced (‘NoS’ means no sensor is connected). The fault LED is on

and the fault relay is de-energized. The channel LED will be on for the sensor being replaced.

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All other display features will be inhibited. In order to exit this mode the SELECT/RESET switch

must be activated.

Sensor Calibration Mode (CAL):

The Uni-Trol Controller uses a fully automatic calibration procedure that requires no adjustments™

by the operator. The controller displays ‘Air’ on the left display and channel status on the right

display while automatically performing the zero adjustments. Next the controller will signal the

user to apply calibration gas by alternating ‘gAS’ and ‘in’ on the left display. W hen the controller

detects that the gas has been applied to the sensor, the left display will read ‘gAS’. Once the

controller has finished the gain adjustments it will alternate ‘Cut’ and ‘gAS’ on the left display,

telling the user that it is time to remove the calibration gas. Upon completion of calibration the

controller will automatically return to normal operating mode, after the gas level has dropped

below 50% of the low alarm setting.

If the operator fails to complete the calibration procedure, if an error in the calibration procedure

occurs, or if a successful calibration cannot be completed, the microprocessor will automatically

return to the Normal Operating Mode and continue to use the previous calibration data. A fault

indication will be displayed until a reset occurs. If the microprocessor determines that the sensor

is approaching the end of its useful life, a fault code will indicate this.

W hile in the calibration mode, all controller outputs are inhibited and the ‘Cal’ LED is illuminated.

Set-Point Display (Spd):

In this mode, the digital display sequentially shows the

programmed low and high alarm set-points, calibration gas concentration, and communication

addresses. Each value is displayed for approximately 2 seconds.

Address Set (Adr Set): DO NOT USE THIS FUNCTION

The communication addresses for the CAN bus are set in this mode, which is found in the special

function menu. The MENU/SET and SELECT/RESET switches are used to raise and lower the

address. This mode can only be exited by allowing ten seconds to go by without activating either

switch.

Error Message Display (ErrChc):

The microprocessor-based controller features self-testing circuitry that continuously checks for

problems that could prevent proper system response. As a diagnostic and troubleshooting tool,

identifiable faults are displayed on the digital display, using error codes, during the Error Message

Display Mode. The controller will also display an error message after the last channel in the

cycling routine.

NOTE

If no errors exist, this function is hidden and can not be accessed.

-8-

Unit II GENERAL INFORMATION (SENSOR)

DESCRIPTION

The Net Safety Monitoring Inc. SC1100 combustible gas sensor head consists of an explosion-

proof enclosure, which contains sensor electronic circuitry. The sensors used are catalytic

oxidation sensors, or pellistors, designed to provide continuous monitoring of combustible gasses

such as methane and butane, etc. in the percent lower explosive limits (LEL). Each sensor is a

matched pair of detector and reference elements which are operated in a W heatstone Bridge

circuit.

FEATURES

High degree of poison resistance means sensors will maintain their sensitivity over extended

periods of operation.

< Designed and manufactured for low drift over temperature extremes.

SPECIFICATIONS

< Range:

0 to 100% LEL

< Operating Humidity Range:

0 to 100% relative humidity

< Response Time:

Less than 30 seconds to reach 90% of full scale reading with methane (in still air).

< Zero Drift:

Typically less than 2% LEL per month

< Sensor Life:

Operation: 2 to 5 years expected.

Storage: Indefinite

< Calibration Cycle:

60 to 90 Days Groups

< Certification:

CSA certified for hazardous locations,

Class 1, Division 1, Groups B, C, and D.

-9-

Figure 4 - Sensor and Transmitter Dimensions

LOWER EXPLOSIVE LIMIT

A combustible gas is one that will burn when mixed with air (or oxygen) and ignited. The lower

explosive limit (LEL), or lower flammable limit (LFL), of a combustible gas is defined as the

smallest amount of the gas that will support a self-propagating flame when mixed with air and

ignited. In gas detection systems, the amount of gas present is specified in terms of % LEL; 0%

LEL being a combustible gas-free atmosphere and 100% LEL being an atmosphere in which the

gas mix is at its lower explosive limit. The relationship between % LEL and % by volume differs

from gas to gas. Refer to Table 3.

GAS, 100% LEL CONCENTRATION

2 Hydrogen (H ) 4.0%

4 Methane (CH ) 5.0%

2 6 Ethane (C H ) 3.0%

2 4 Ethylene (C H ) 2.7%

5 12 Pentane (C H ) 1.5%

3 8 Propane (C H ) 2.2%

Table 3 -Flammable Gas Volume for 100% LEL

For data on other gases, refer to NFPA 5th Edition 325M.

-10-

The LEL of gas is affected by temperature and pressure. As the temperature increases, the LEL

decreases and hence the explosion hazard increases.

The relationship between LEL and pressure is fairly complex, but at approximately one

atmosphere, a pressure increase usually lowers the LEL. The LEL of a gas is not significantly

affected by the humidity fluctuations normally encountered in the operation of a gas detection

system.

OPERATION OVERVIEW

The sensors used are catalytic oxidation sensors, or pellistors, designed to measure

concentrations of combustible gases in air up to their lower explosive limit. Each sensor is a

matched pair of detector and reference elements which are operated in a W heatstone Bridge

circuit. The active element, which comprises a coil of platinum wire embedded within a catalytic

bead is capable of oxidizing combustible gases while the inert reference element compensates for

changes in ambient temperature and humidity. The heat generated during oxidation increases the

temperature and resistance of the detector element, producing an out-of-balance signal in the

W heatstone Bridge circuit proportional to the concentration of combustible gas.

Table 4 lists the theoretical factors by which the signal with a calibration gas should be multiplied

to give the signal for other gases. The following formula may be used:

NOTE

These figures are theoretical, and may differ from sensor to sensor. For best results, the

sensors should be calibrated with the gas they are intended to detect.

Example: For an instrument calibrated with Methane and used to detect Propane.

M E TH A N EK = 112.0

P R O P AN EK = 61.8

Signal shown for 50%LEL Propane is calculated as follows:

Signal = 50% x 61.8 / 112 = 27.6%

-11-

GAS K GAS K GAS K

Acetaldehyde 67.3 n-Decane 36.7 Dimethyl Ether 70

Acetic Acid 60.8 Diethylamine 54.6 Methylethylether 49.3

Acetic Anhydride 51.5 Dimethylamine 64.7 Methylethylketone 46.2

Acetone 57.8 2,3-Dimethylpentane 44.6 Methyl Formate 75

Acetylene 63.6 2,2-Dimethylpropane 44.4 Methylmercaptan 67.9

Alkyl Alcohol 57.1 Dimethylsulphide 48.6 Methylpropionate 57.2

Ammonia 142 1,4-Dioxane 50 Methyl n-propylketone 45.4

n-Amyl Alcohol 36.6 Ethane 75.8 Naphthalene 38.1

Aniline 44.1 Ethyl Acetate 57.4 Nitromethane 64.8

Benzene 45.6 Ethyl Alcohol 81.5 n-Nonane 35.2

Biphenyl 28 Ethylamine 58.9 n-Octane 41.9

1,3-Butadiene 62.5 Ethyl Benzene 39.9 n-Pentane 51.3

n-Butane 65.5 Ethylcyclopentane 44.4 iso-Pentane 51.9

iso-Butane 57.8 Ethylene 79.1 Propane 61.8

Butene-1 50.8 Ethyleneoxide 57.9 n-Propyl Alcohol 52.7

cis-Butene-2 54.2 Diethyl Ether 51.8 n-Propylamine 54.1

trans-Butene-2 56.7 Ethyl Formate 49.5 Propylene 57.7

n-Butyl Alcohol 38.4 Ethylmercaptan 62.8 Propyleneoxide 51.2

iso-Butyl Alcohol 59.2 n-Heptane 43.2 iso-Propylether 48.8

tert-Butyl Alcohol 83.1 n-Hexane 41.2 Propyne 46.5

n-Butyl Benzene 35.2 Hydrazine 50.4 Toluene 45.2

iso-Butyl Benzene 35.8 Hydrogencyanide 53.4 Triethylamine 44.6

n-Butyric Acid 42.5 Hydrogen 85.8 Trimethylamine 54.3

Carbon Disulphide 19.8 Hydrogen Sulphide 45.6 Vinylethylether 46.9

Carbon Monoxide 84.4 Methane 112 o-Xylene 40.1

Carbon Oxysulphide 105 Methyl Acetate 55.6 m-Xylene 43.8

Cyanogen 99.9 Methyl Alcohol 96.2 p-Xylene 43.8

Cyclohexane 46 Methylamine 86.5

Cyclopropane 69.7 Methylcyclohexane 49.4

Table 4 - K Factor for Various Gases

-12-

Unit IIISYSTEM INSTALLATION

INSTALLATION

SENSOR LOCATIONS

Proper location of the sensors is essential for providing maximum protection. The method for

deciding the most effective number and placement of sensors varies depending on the conditions

at the job site. The individual performing the installation must rely on experience, common sense,

and knowledge of plant operations to determine the number of sensors needed and the best

controller locations to protect the area adequately.

The following factors are important and should be considered for every installation:

< Sensors should be located where they are safe from potential sources of contamination.

< Refer to sensor application manuals and follow guidelines for sensor installation.

< Sensors must be accessible for testing and calibration.

< Exposure to excessive heat or vibration can cause premature failure of electronic devices,

and should be avoided if possible.

GENERAL WIRING REQUIREMENTS

NOTE

The wiring procedures in this manual are intended to ensure proper functioning of the

device under normal conditions. However, because of the many variations in wiring codes

and regulations, total compliance to these ordinances cannot be guaranteed. Be certain

that all wiring complies with applicable regulations that relate to the installation of

electrical equipment in a hazardous area. If in doubt, consult a qualified official before

wiring the system.

The use of shielded cable is highly recommended for any signal wires to protect against

interference caused by extraneous electrical 'noise'. This includes power and current outputs;

relay outputs do not require shielded cable. In applications where the wiring cable is installed in

conduit, the conduit must not be used for wiring to other electrical equipment.

NOTE

The S1G and S2G controllers have been certified, as ‘No Seal Required’ since it will not

ignite an explosive atmosphere, under normal operating conditions. Net Safety

Monitoring Inc. does, however, recommend conduit seals to prevent moisture damage.

Since moisture can be detrimental to electronic devices, it is important that moisture not be

allowed to contact the electrical connections of the system. Moisture in the air can become

trapped within sections of conduit. Therefore, the use of conduit seals is recommended to

prevent damage to electrical connections caused by condensation within the conduit.

These seals must be watertight and explosion-proof and should be installed even if they are not

required by local wiring codes. A seal should be located as close to the device as possible. Never

should this seal be located more than 18 inches (46 cm) from the device. W hen an explosion-

proof installation is required, an additional seal may be needed at any point where the conduit

enters a non-hazardous area. Always observe the requirements of local codes.

-13-

W hen pouring a seal, the use of a fibre dam is required to assure proper formation of the seal.

The seals should never be poured in temperatures that are below freezing, since the water in the

sealing compound will freeze and the compound will not dry properly. Contamination problems

can then result when temperatures rise above the freezing point and the compound thaws.

The shielding of the cable should be stripped back to permit the seal to form around the individual

leads, rather than around the outside of the shield. This will prevent any siphoning action that can

occur through the inside of the shield.

It is recommended that conduit breathers also be used. In some applications, alternate changes in

temperature and barometric pressure can cause 'breathing', which allows the entry and circulation

of moist air throughout the conduit. Joints in the conduit system and its components are seldom

tight enough to prevent this 'breathing'. Moisture in the air can condense at the base of vertical

conduit runs and equipment enclosures, and can build up over a time. This can be detrimental to

electronic devices. To eliminate this condition, explosion-proof drains and breathers should be

installed to bleed off accumulated water automatically.

The maximum distance between the sensor and controller is limited by the resistance of the

connecting wiring, which is a function of the gauge of the wire being used. Three wire, 18 AW G,

shielded cable is recommended. If the recommended wire is used, the sensors may be located

up to 500 feet from the controller.

CAUTION

All terminations between the controller and sensors must be good tight electrical

connections. If proper connections are not made, the voltage monitoring circuit in the

controller will not function properly and the sensors may be damaged or operate

incorrectly.

CONTROLLER WIRING

NOTE

The controller contains semiconductor devices that are susceptible to damage by

electrostatic discharge. An electrostatic charge can build up on the skin and discharge

when an object is touched. Therefore, use caution when handling, taking care not to touch

the terminals or electronic components. For more information on proper handling, refer to

the Appendix.

The sensor direct, Unitrol controllers (S1G and S2G) can be configured for an isolated or non-

isolated current output by changing a jumper on one of the controllers circuit boards (see 6a

Figure 3). Figure 5 and 6 show the terminal configuration for the controllers. Figures 5a and 6a

show the proper wiring of the controller for a non-isolated current output. Figure 5b and 6b show

the proper wiring of the controller for an isolated current output.

NOTE

If local wiring codes permit, and if a ground fault monitoring system is not being used, the

minus side of the DC power source can be connected to chassis (earth) ground.

Alternatively, a 0.47 microfarad, 100 Volt capacitor can be installed between the minus

side of the DC power supply and chassis ground for best immunity against

electromagnetic interference.

-14-

-15-

-16-

-17-

-18-

Figure 7b - Dip Switch

DIP SWITCH SETTINGS

It is essential that the controller be properly programmed before applying power to the system.

There are three banks of dip switches located on the controller. Each switch bank has eight

individual switches that can be set to an ‘ON’ or ‘OFF’ position.

NOTE

The dip switches are located on the bottom side of the display circuit board. The switch

banks are numbered from right to left as numbers SW3, SW4, and SW5. Refer to

Figure 8a. Individual switches are referenced as “X.Y”, where “X” refers to the bank

number and “Y” refers to the switch number on “X” bank. For example, switch 3.4 (SW3.4)

is switch number four on bank number three. ‘Switches are set as either “ON” or “OFF”.

Refer to Figure 8b.

NOTE

IT IS VERY IMPORTANT THAT POWER TO THE CONTROLLER IS RECYCLED

AFTER ANY DIP SWITCH CHANGES, TO MAKE THE CHANGES TAKE EFFECT!

Figure 7a - Dip Switch Position

ACTIVE CHANNELS

Switches for setting the active channels (the channels that are to have sensors/transmitters

attached) can be found on Switch Bank 3, switch 1 (SW 3.1). Set the designated switch to “OFF” if

the channel is to be connected (sensor attached), and “ON” if the channel is not to be used.

SW 3.1 will be set to the ‘OFF’ position for you.

SW 3.1: OFF: channel 1 connected

ON: channel 1 not connected

NOTE

SW3.2 to SW3.4 are not used and should be turned ‘ON’.

CALIBRATION GAS CONCENTRATION:

Calibration gas concentration is set using the dip switches on the circuit board. To select the

calibration gas concentration of 50% LEL, set SW 3.5 to ‘OFF.’ If a selectable value (from 20% to

99%) is required, set SW 3.5 to ‘ON’; SW 4.1 through SW 4.7 must then be used to select the

calibration gas concentration. SW 3.5 is factory set to the ‘OFF’ position.

-19-

SW 3.5: OFF: calibration gas set to 50%

(ignore SW 4.1 - SW 4.7)

ON: calibration gas selectable

(set SW 4.1 - SW 4.7)

NOTE

If SW3.5 is set to ‘ON’, it is very important to accurately set SW4.1 to SW4.7. If SW3.5 is

set to ‘OFF’ position, the settings of SW4.1 to SW4.7 are inconsequential.

If the selectable option is chosen (above), the calibration gas concentration must be set. This is

done on Switch Bank 4, switches 1 through 7 (SW 4.1 to SW 4.7). The required calibration gas

concentration must be set with these switches using the binary counting system. “ON” selects the

value listed below; “OFF” selects a zero.

SW 4.1: ON: 1%

SW 4.2: ON: 2%

SW 4.3: ON: 4% calibration

SW 4.4: ON: 8% gas

SW 4.5: ON: 16% concentration

SW 4.6: ON: 32%

SW 4.7: ON: 64%

The switches can be used in combination to select concentrations from 20% to 99% LEL.

Example:

SW 4.1 OFF

SW 4.2 OFF

SW 4.3 ON calibration gas

SW 4.4 ON concentration

SW 4.5 ON = 60% LEL

SW 4.6 ON

SW 4.7 OFF

NOTE

If a calibration gas concentration greater than 99% or less than 20% is programmed, the

controller will give a configuration error (E90) when power is applied.

POWER-UP TIME DELAY

SW 3.6 is used to select the power-up time delay:

SW 3.6: OFF: 45 seconds

ON: 90 seconds

NOTE

SW3.7 and SW3.8 are not used.

ALARM SETTINGS

Switch bank 4, switch 8 (SW 4.8) is used to set the Low and High alarm to a default or selectable

value. If SW 4.8 is ‘OFF’ the Low Alarm will be set to 20% LEL and the High Alarm to 40% LEL.

If SW 4.8 is ‘ON’, the low and high alarm are selectable, using SW 5.3 to SW 5.8. Switch 4.8 is set

to the ‘OFF’ position at the factory.

SW 4.8: OFF: low alarm @ 20%

high alarm @ 40%

(ignore SW 5.3 - SW 5.8)

-20-

ON: selectable alarm

(set SW 5.3 - SW 5.8)

NOTE

If SW4.8 is set to ON, it is very important to accurately set SW5.3 to SW5.8. If SW4.8 is

set to the ‘OFF’ position, the settings of SW5.3 to SW5.8 are inconsequential.

If the selectable option is chosen (SW 4.8 is ‘ON’), the alarms must be set with SW 5.3 to SW 5.8.

The low alarm can be set from 5% to 40% LEL and the high alarm is automatically set at twice the

low alarm value. The low alarm value is set using the binary counting system. ‘ON’ selects the

value listed below; ‘OFF’ selects a zero.

SW 5.3: ON: 1%

SW 5.4: ON: 2%

SW 5.5: ON: 4%

SW 5.6: ON: 8%

SW 5.7: ON: 16%

SW 5.8: ON: 32%

The switches can be used in combination to select low alarm settings from 5% to 40% LEL. If a

low alarm level less than 5% or greater than 40% is programmed, the controller will give a

configuration error(E90) upon power up.

Example:

SW 5.3 OFF

SW 5.4 OFF

SW 5.5 ON low alarm 12% LEL

SW 5.6 ON high alarm 24% LEL

SW 5.7 OFF

SW 5.8 OFF

NOTE

IT IS VERY IMPORTANT THAT POWER TO THE CONTROLLER IS RECYCLED

AFTER ANY DIP SWITCH CHANGES, TO MAKE THE CHANGES TAKE EFFECT!

LATCHING/NON-LATCHING SELECTION

Switch Bank 5, switch 1 is used to set the low alarm relays for latching or non-latching operation;

the high alarm is always latching and the fault is always non-latching.

SW 5.1: OFF: low alarm relay latching operation

ON: low alarm relay non-latching operation

NOTE

IT IS VERY IMPORTANT THAT POWER TO THE CONTROLLER IS RECYCLED

AFTER ANY DIP SWITCH CHANGES, TO MAKE THE CHANGES TAKE EFFECT!

Refer to Table 3, at the end of this unit, for a summary of the dip switch settings.

ENERGIZED/DE-ENERGIZED SELECTION

Switch Bank 5, switch 2 (SW 5.2) is used to set the high and low alarm relays for normally

energized or normally de-energized operation; the fault relay is always normally energized. SW 5.2

is factory set to the ‘ON’ position.

SW 5.2: OFF: alarm relays normally energized

ON: alarm relays normally de-energized

-21-

RELAY SETTINGS

There are three relays on the controller circuit board that can be set up for normally open or

normally closed operation by moving the jumpers which are located below the relays. See Figure

9a for the location of the relays on the circuit board and Figure 9b for the correct settings.

Figure 9a - Relay Positions Figure 9b - Relay Settings

INSTALLATION CHECKLIST

The following checklist is provided as a means of double checking the system to be sure that all

phases of system installation are complete and have been performed correct.

T Controller is securely mounted and sensor is oriented correctly

T All cable shields are properly grounded at one end only

T Explosion-proof conduit seals have been installed at all conduit entries (if conduit

is being used)

T Sensor to controller wiring is correct

T Power wiring to the controller is installed and power source is operational

T External loads are properly connected to the controller

T Controller is programmed as needed. Record this information for future

reference. A table is provided in the appendix for this purpose

T Controller is properly installed in the housing

-22-

T Proper ventilation is provided to prevent overheating of the controller

SWITCH OPEN (OFF) CLOSED (ON)

SW 3.7 & SW 3.8 NOT USED

SW 3.1 Channel 1 connected Channel 1 not connected

SW 3.2 Channel 2 connected Channel 2 not connected

SW 3.3 Channel 3 connected Channel 3 not connected

SW 3.4 Channel 4 connected Channel 4 not connected

SW 3.5 Calibration gas concentration is

set to 50% of full scale (ignore

SW 4.1 to SW 4.7)

Calibration gas concentration is selectable

using SW 4.1 to SW 4.7

SW 3.6 Power-up time delay is 45 seconds Power-up time delay is 90 seconds

SW 4.1 - SW 4.7 Set calibration gas concentration from 20% to

99% of full scale

SW 4.8 LOW alarm @ 20% of full

scale/HIGH alarm @ 40% of full

scale (ignore SW 5.3 to SW 5.8)

Selectable alarm settings using SW 5.3 to

SW 5.8 (LOW = 5% to 40% of full scale; HIGH

= 2 x LOW )

SW 5.1 LOW alarm relay is latching LOW alarm relay is non-latching

SW 5.2 LOW and HIGH alarm relays

normally energized

LOW and HIGH alarm relays normally de-

energized

SW 5.3 - SW 5.8 Set LOW alarm settings from 5% to 40% of

full scale (HIGH alarm is twice the LOW alarm

setting)

Table 5 - Summary of Dip Switch Settings

Unit IVSYSTEM OPERATION

MENU AND FUNCTION SELECTION

The controller has various functions and menus that can be entered by activating the MENU/SET

(and SELECT/RESET) switches for a specified amount of time. Table 6, below, indicates how to

enter the various menus and functions.

SWITCH TIME FUNCTION OR MENU

SELECT/RESET < 0.5 sec Basic Reset

SELECT/RESET 1 sec Forced Reset

MENU/SET 2 sec Forced Display [FdP]

MENU/SET 5 sec Main Menu

MENU/SET & SELECT/RESET

Simultaneously

20 sec Special Function Menu

Table 6a - Menu and Function Selection

-23-

Further explanation on how to enter the functions will be given in the following discussion. The

Main Menu has five functions within it (See Table 7) and the Special Function Menu has five

functions (See Table 8).

To enter the Main Menu, activate the MENU/SET switch for approximately 5 seconds, until ‘Err

Chc’ or ‘Spd’ is displayed, then release it. Once in the Main Menu, the next selection can be

brought up by activating the MENU/SET switch. The SELECT/RESET switch is used to accept a

currently displayed selection.

Failure to activate any switches for a period of 10 seconds will result in the controller returning to

the Normal Operating Mode. Selecting the Return function will also return the controller to the

Normal Operating Mode. W hen “rtn” is on the lower digital display, momentarily activate the

SELECT/RESET switch.

Summary of Main Menu:

Enter Main Menu: MENU/SET for 5 sec.

Find Desired Function: MENU/SET

Select Function: SELECT/RESET

Next Function: MENU/SET

Exit Main Menu: no buttons for 10 sec. or Select RETURN function

LEFT DIGITAL

DISPLAY

RIGHT DIGITAL

DISPLAY FUNCTION

Err Chc Error Check (hidden if no errors)

blank SPd Set Point Display

blank CAL Calibration

blank SrP Sensor Replacement

blank rtn Return

Table 6b - Main Menu Selection

LEFT DIGITAL

DISPLAY

RIGHT DIGITAL

DISPLAY FUNCTION

blank FOP Forced current output

blank CUC Current output calibration

Adr SEt Set network address

blank Chd Channel display

blank bPS Bypass

blank rtn Return

Table 7 - Special Function Menu Selection

START-UP PROCEDURE

2 Output loads that are normally actuated by the system should be secured.

Remove power from all of the output devices to prevent undesired activation

3 Check all external wiring for proper connections. Be sure that the sensor has

been wired properly

-24-

4 Before installing the controller, inspect it to verify that it has not been physically

damaged in shipment. Check the dip switches on the controller for proper

programming

5 Apply power to the system.

NOTE

The controller has a 45 or 90 second delay (as programmed), before beginning normal

operation, after power is applied to the system. During this time the outputs are inhibited,

the Fault LED is illuminated, the left digital display cycles through the active channels, and

the right digital display counts down from 45 or 90. This delay allows time for the sensors

to stabilize before beginning normal operation.

6 Put the controller in the Set-point Display Mode to check the present alarm set-

points and calibration gas concentration. If changes are required, refer to the ‘Dip

Switch Setting’ section of the manual

7 Calibrate the sensor(s); refer to the Sensor Calibration Procedure

8 Remove mechanical blocking devices (if used) and restore power to the output

loads

MAIN MENU SELECTIONS

ERROR CHECK MODE (Err Chc)

The microprocessor-based controller features self-testing circuitry that continuously checks for

problems that could prevent proper system response. As a diagnostic and troubleshooting tool,

identifiable faults are displayed on the digital display during the Error Message Display Mode.

Two types of faults are identified: system faults and channel faults. Table 7 lists the codes and

the corresponding conditions.

If a fault should occur:

< the normally energized fault output is de-energized,

< the Fault LED is illuminated, and

< if no alarm is occurring and the controller is sequentially displaying each sensor input, the

message ‘Err’ ‘Fnd’ (left and right displays) will be displayed after each sequence.

To view the fault code, enter the Main Menu, then momentarily activate the SELECT/RESET reed

switch when ‘Err’ is displayed on The right digital display. Next, activate the MENU/SET reed

switch repeatedly; the left digital display will sequentially show:

‘SYS’ - system faults

‘CH1' - channel 1 faults

‘CH2' - channel 2 faults

‘CH3' - channel 3 faults

‘CH4' - channel 4 faults

‘Clr’ - clear faults

NOTE

If no errors exist, this function is hidden and can not be accessed.

To select the fault to be displayed, momentarily activate the SELECT/RESET reed switch when

the required fault is being displayed on the left digital display. The left digital display will show the

channel (or system) and the right digital display will show the fault code, for 5 seconds then move

to the next channel.

-25-

NOTE

Faults that affect the actual function of the controller (50, 60, 70, 9X) can impair the ability

of the controller to maintain an alarm output.

All faults automatically reset except the 9X, 20, and 10 faults. After the fault condition has been

corrected, the fault output automatically switches to the normal (energized) state, the DC current

output returns to normal, and the Fault LED turns off. Clearing 9X faults requires removing

operating power from the controller for approximately one second. Clearing 20 and 10 requires a

reset.

CAUTION

The fault detection circuitry does not monitor the operation of external response

equipment or the external wiring to these devices. It is important that these devices be

checked periodically to ensure that they are operational.

SET-POINT DISPLAY MODE (SPd)

1 In this mode, the digital displays sequentially display the low and high alarm and

calibration gas concentration automatically. This function is used to check the

present alarm and calibration gas set-point values.

2 To enter the Set-point Display Mode, enter the Main Menu, activate the

MENU/SET reed switch repeatedly until ‘Spd’ is displayed on the right digital

display, then momentarily activate the SELECT/RESET reed switch

3 The Low LED goes on, ‘LoA’ is shown on the left digital display, and the low

alarm set-point is shown on the right digital display for 2 seconds

4 The Low LED goes out, the High LED goes on, ‘HiA’ is shown on the left digital

display, and the high alarm set-point is shown on the right display for 2 seconds

5 The High LED goes out, the Cal LED goes on, ‘CAL’ is shown on the left display,

and the calibration gas concentration (in percent LEL) is shown on the right

display for 2 seconds

6 The Cal LED goes out, ‘Adr’ is shown on the left display and the right digital

display shows the communication address for the CAN interface for 2 seconds.

Address setting is not used

7 Finally, the controller returns to the normal operating mode (it is no longer in the

main menu)

8 If adjustments to the set-points are required, the settings on the programming dip

switches must be changed; Refer to ‘DIP SW ITCH SETTINGS’ in the ‘SYSTEM

INSTALLATIONS’ section of this manual for instructions. W hen the set-point

levels are acceptable, record this information for future reference and proceed to

‘CALIBRATION.’

NOTE

IT IS VERY IMPORTANT THAT POWER TO THE CONTROLLER IS RECYCLED

AFTER ANY DIP SWITCH CHANGES, TO MAKE THE CHANGES TAKE EFFECT!

STATUS CONDITION WHAT TO DO

E90 Dip Switch Configuration error Check dip switch settings and recycle

power

-26-

E91 RAM or processor failure Consult the Factory

E94 Set-point and calibration data lost Consult the Factory

E95 Internal 5 volt supply failure during

start-up

Consult the Factory

E96 External 24 volt supply failure during

start-up

Consult the Factory

E97 EEPROM failure Consult the Factory

E98 Duplicate CAN address. Check CAN address and change to a

vacant address

E99 Lost communication. Check communication wiring, disconnect

controller, and re-connect it. If this does

not help, contact the factory

CHx E80 Sensor output is more than 26 mA Check wiring and signal output from

sensor

CHx E70 External reset switch has been

activated for 15 seconds or longer.

Self clearing when switch is released.

Check external reset switch for a short,

or faulty operation

CHx E40 Sensor (or transmitter) input failure;

input is below 1 mA.

Check wiring and signal output from

sensor.

CHx E30 Negative zero drift; sensor (or

transmitter) is -9% full scale or lower.

Calibrate transmitter.

CHx E20 Time ran out while waiting for the user

to apply gas to the sensor.

Restart calibration procedure.

CHx E21 Sensor (or transmitter) output is too

low; enough offset to get an accurate

calibration is not being generated.

Calibrate transmitter or replace sensor.

CHx E22 Sensor can not be calibrated. Calibrate transmitter or replace sensor.

CHx E23 Sensor is too sensitive for the detector

to read 100% full scale.

Calibrate transmitter or replace sensor.

CHx E24 Zero point is more than 6% below

standard value

Calibrate transmitter

CHx E25 Zero point is more than 6% above

standard value

Calibrate transmitter

CHx E10 Calibration was successful, but sensor

reaching end of life or time to change

jumper position on transmitter

Be prepared to calibrate transmitter or

replace sensor at next calibration time

CHx goP Over-range error (reading greater than

100% of full range)

Insure area has been de-contaminated

then perform a forced reset

Table 8 - System Status Codes (Chx = Channel number)

SENSOR CALIBRATION (CAL)

General Information

-27-

Various factors affect the interval between periodic calibrations. Exposure to certain

contaminants in the air, accumulation of contaminants on the filter, or an extended period of

normal operation can cause changes in sensitivity. Since each application is different, the length

of time between regularly scheduled calibrations can vary from one installation to the next. In

general, the more a system is checked, the greater the reliability. A calibration must be

performed:

< when a new system is initially put into service,

< when the sensor is replaced, or

< when a controller is replaced.

IMPORTANT

To ensure adequate protection, the detection system must be calibrated on a regularly

scheduled basis.

The Controller uses a fully automatic calibration procedure that requires no adjustments by the

operator. The controller performs the zero adjustments, then signals the operator when to apply

and when to remove the calibration gas.

W hile in the Sensor Calibrate Mode, all controller outputs are inhibited, the current output is 3mA,

and the Cal LED is illuminated.

NOTE

If the sensor is being replaced, refer to the 'Sensor Replacement' section (under

'Maintenance') in this manual for information regarding replacement and calibration of the

sensor.

Calibration Procedure

1 The sensor should be allowed to stabilize for a minimum of 4 hours, although it is

best to allow 24 hours for the sensor to stabilize.

2 Be certain that the controller is properly programmed for the gas concentration

being used for calibration. (Refer to ‘SET-POINT DISPLAY MODE’ to check

programmed value.) Reprogram the controller if required. (Refer to ‘DIP

SW ITCH SETTINGS.’) Failure to do so will greatly impair system response.

NOTE

IT IS VERY IMPORTANT THAT POWER TO THE CONTROLLER IS RECYCLED

AFTER ANY DIP SWITCH CHANGES, TO MAKE THE CHANGES TAKE EFFECT!

3 Be sure that only clean air is present at the sensor. The microprocessor begins

taking zero readings immediately upon entering the Calibrate Mode. If the

possibility of background gases exists, purge the sensor with clean air to assure

an accurate calibration.

4 Enter the Main Menu, activate the MENU/SET reed switch repeatedly until ‘CAL’

is shown on the right digital display, then momentarily activate the

SELECT/RESET reed switch.

5 Once in the sensor calibrate mode, the right digital display will continue to show

‘CAL’ and the left digital display will show ‘Chn’. Activate the MENU/SET reed

switch repeatedly until the desired channel is shown on the left digital display,

then momentarily activate the RESET/SELECT reed switch.

-28-

6 Once the required channel has been selected, the controller will automatically

start taking zero readings. The left digital display will show ‘Air’ and the right

display will flash a value close to zero. W hen the zero calculations are complete

(30 seconds minimum), the right digital display stops flashing and reads '00'; the

left display will now alternately display ‘gAS’ and ‘in’.

7 Apply the calibration gas to the sensor. The right digital display starts to flash,

and the value indicated on the display rises. The bar graph display also indicates

the level of gas at the sensor, but does not flash. The left display will show ‘gAS’.

8 W hen the microprocessor has completed the gain adjustments (30 seconds

minimum), the right digital display stops flashing and the left display will

alternately display ‘Cut’ and ‘gAS’.

9 Remove the calibration gas. W hen the gas level falls to half the low alarm

set-point, the controller automatically returns to the normal operating mode.

10 If another sensor must also be calibrated, return to step 1.

If the operator fails to complete the calibration procedure or if the sensitivity of the sensor has

deteriorated to the extent that calibrations cannot be successfully completed, a calibration fault

(‘E2X’ status) will be generated. The system will automatically revert to the former calibration

settings (after 10 minutes or when the gas level drops below the lowest set-point). If a successful

calibration cannot be accomplished, replace the sensor and calibrate (refer to the

transmitter/sensor manual, as some transmitters will have gain jumpers which need to be

changed and the sensor may still be useful).

If the microprocessor determines that the sensor is approaching the end of its useful life or the

gain jumper on the transmitter needs to be changed, ‘E10' will be indicated on the digital display.

This does not indicate a system malfunction, but is intended to notify the operator of this condition.

A successful calibration can still be performed, but the operator should be prepared to change the

sensor at the time of the next calibration. Activate SELECT/RESET after completing calibration to

clear the display.

SENSOR REPLACEMENT MODE (SrP)

This mode inhibits all controller outputs to allow replacement of the sensor(s) without removing

power from the controller. Alarm set-points and calibration gas concentration are not affected.

The left display will show ‘SrP’ while in the sensor replace mode. The right display will show the

status of the sensor being replaced (‘NoS’ means no sensor is connected). The fault LED is on

and the fault relay is de-energized. The channel LED will be on for the sensor being replaced.

All other sensors remain active during sensor replace mode. If an alarm condition occurs on one

of the active channels while in this mode, the appropriate channel LED will flash and relays will act

accordingly. All other display features will be inhibited. In order to exit this mode the

SELECT/RESET reed switch must be activated. The controller will perform a power-up count

down (45 or 90 seconds) for the replaced sensor, and the affected current output will drop to 1mA.

SPECIAL FUNCTION MENU SELECTIONS

FORCED CURRENT OUTPUTS (FoP)

-29-

The forced current output mode is used to check the current output calibration and the operation

of any devices connected to the current outputs.

To enter the forced current output mode, enter the special function menu. W hen ‘FoP’ is shown

on the right display, activate the SELECT/RESET reed switch. Upon successful entry into this

mode the left display will flash ‘gPn’. Activate the MENU/SET reed switch until the desired area

output is reached (‘GPA’ = Area 1 and ‘GPb’ = Area 2), then activate the SELECT/RESET reed

switch.

W hen an area has been chosen for forced current output, the left display will alternate between

‘GPX’ and ‘FoP’ and the right display will show what type of current output (in gas concentration)

is being placed on the current output line.

The push-button switches are used to change the current output. To exit this function, hold the

SELECT/RESET reed switch down until ‘rtn’ is shown on the right display. Release the reed

switch, and the controller will return to the normal operating mode in 10 seconds if no reed

switches are pushed.

CURRENT CALIBRATION MODE (CuC)

The next selection in the special function menu is the current calibration mode. This mode is

selected to calibrate the current outputs. The Area output to calibrate is chosen as in the Forced

Current Output Mode. Once an area has been selected, the left display will alternate between

‘CuC’ and the area that is being calibrated (‘GPX’). The right display will show a constant which

will rise and fall as the current is adjusted (does not show the current on the outputs). Place a

milliamp metre between the Area current output and system common. Use the magnetic reed

switches to raise and right the current. Once the current measured is as close to 4mA as

possible, do not activate any reed switches for 10 seconds and the constant shown on the right

display will change to a much higher number. This tells the operator that it is time to calibrate the

higher end of the current output range. Use the magnetic reed switches to bring the current level

as close as possible to 20mA. Do not activate any reed switches for 10 seconds and the constant

shown on the display will change to a lower number. Now it is time to calibrate the current output

to 3mA for when the controller is in the calibration mode. Once this current level is set, do not

activate any reed switches for 10 seconds and the controller will return to the normal operating

mode.

ADDRESS SET MODE (Adr Set) (Do not use)

Do not use the next selection in the special function menu. It is the address set mode, used

to set the controllers address for the CAN system. W hen the left display shows ‘Adr’ and the right

display shows ‘SEt’ activate the SELECT/RESET reed switch. The left display will alternate

between ‘Adr’ and ‘SEt’ and the right display will show the current address. Use the magnetic

reed switches to raise and lower the address. Once the address is correct, do not activate any

reed switches for 10 seconds and the controller will return to the normal operating mode.

CHANNEL DISPLAY(Chd)

In this mode, the displays can be forced to monitor only one channel, as long as no alarms are

occurring. If any alarm occurs, the controller will return back to the Normal Operating Mode for

the situation when an alarm is occurring.

Enter the Special Function Menu, activate the MENU/SET reed switch repeatedly until ‘Chd’ is

displayed on the right digital display, then momentarily activate the SELECT/RESET reed switch.

The left digital display will show ‘Chn’. Activate the MENU/SET reed switch repeatedly to toggle

through the channels (CH1, CH2, CH3, or CH4). To select a channel, momentarily activate the

-30-

SELECT/RESET reed switch when the required channel is displayed, on the left digital display.

The displays will now only display the information for the chosen channel.

To return to the normal operating mode, enter the manual display mode again and instead of

selecting a single channel, select ‘ALL’.

BYPASS (bPS)

The bypass mode is entered through the special functions menu. Enter the special functions

menu and activate the MENU/SET reed switch repeatedly until ‘bPS’ is shown on the right digital

display, then momentarily activate the SELECT/RESET reed switch. The right digital display will

still show ‘bPS’ and the left display will show ‘gPn’. Select the group to put in bypass mode by

activating the MENU/SET reed switch repeatedly until the desired group is shown, then activate

the SELECT/RESET reed switch momentarily.

W hile in bypass mode, the alarm outputs for the selected group(s) are inhibited. The HIGH alarm

relay is common to both groups, and is inhibited even if the unselected group has an alarm

condition. CAUTION SHOULD BE USED WHILE IN BYPASS MODE.

To exit the bypass mode, activate the SELECT/RESET reed switch momentarily.

OPERATING MODES

RESET MODE

The Reset Function is entered by activating the SELECT/RESET reed switch located on the front

panel of the controller. (Refer to Figure 2.) W hen the SELECT/RESET reed switch is activated

momentarily, all LEDs turn off and all outputs return to their normal condition if no alarms or

faults are occurring.

FORCED RESET MODE

If any of the channels gets a reading beyond 100% of full scale, a reset will not clear the alarms,

even if the channel has returned to levels below the low alarm set point. The error resulting from

this occurrence must be cleared in the error check mode and then a forced reset must be applied.

To apply a forced reset, activate the SELECT/RESET reed switch for 1 second, the LEDs turn off

and the outputs return to their normal condition. Remote reset performs a forced reset.

NOTE

The remote reset performs a reset function only. It cannot be used for other controller

functions.

NORMAL OPERATING MODE

The following discussion covers the situation where no fault condition is occurring. Refer to

‘FAULT IDENTIFICATION’ for a discussion on faults.

In the Normal Operating Mode with no alarm:

< The digital and bar graph displays are on and indicate the sensor(s) input(s). If only one

channel is active, then the displays will stay on that channel; if two or more channels are

active, the displays will sequentially display the channels, for 5 seconds each. The left

digital display will indicate the channel (CH1, CH2, CH3, or CH4) and the right digital

display will indicate the sensor reading.

< The Channel LEDs will indicate which channel the digital display is referring to.

-31-

< All other LEDs are off.

< Alarm relays are in their normal state, energized or de-energized as programmed.

< Fault relay is energized.

In the Normal Operating Mode with a low alarm(s) condition occurring:

< Digital and bar graph displays indicate the sensor input(s) as outlined above.

< If one channel is in alarm, the system will stay at that channel.

< If more than one channel is in alarm, the channel with the ‘highest’ alarm condition will be

displayed. The channel LED of other channels will flash to notify that an alarm condition

exists. To force the display of a channel with a ‘lower’ alarm, go into the Forced Display

Mode, as outlined in the next section.

< Low LED flashes.

< Low alarm relay changes state.

< Fault relay is energized and fault LED is off.

W hen the signal decreases below the low set-point:

< The digital display and bar graph display continue to track the sensor input.

< W ith latching operation programmed, low alarm relays will not change.

< W ith non-latching operation programmed, low alarm relays will return to their normal

state.

< Low Alarm LEDs are on steady, while the affected channel is displayed, until reset.

If a high alarm condition occurs, the module will be in a Level 3 Display Mode; the bar graph and

digital display will cycle through all channels with a high alarm condition. W hile one channel is

displayed, the channel LED for any other channel in a high or low alarm state will flash.

NOTE

When 1 or more channels are in a high alarm condition and 1 or more channels are in a

low alarm condition, only the channels in the high alarm condition will be cycled on the

display. The channel LED for any channel in the low alarm condition will flash.

If one or more channels reach an ‘over-range’ (>100% of full scale) condition, the error

must be cleared in the error check mode and then a forced reset must be performed once

the channel has returned to normal. A basic reset will not clear an over-range error.

FORCED DISPLAY (FdP)

In the normal operating mode with no alarms occurring, the digital and bar graph displays will

sequentially display each of the channel sensor readings. If an alarm condition occurs, the

displays will remain on the channel with the alarm (or ‘highest’ alarm if more than one channel is

in an alarm condition). In this situation, the forced display mode can be used to temporarily view

the sensor readings of the other channels.

To enter the Forced Display Mode, activate the MENU/SET reed switch for 2 seconds, until the

right digital display shows ‘FdP’. Momentarily activate the SELECT/RESET reed switch to select

this function. The digital displays will then sequentially display each of the active channels once

before returning to the Normal Operating Mode automatically.

Unit VSYSTEM MAINTENANCE

-32-

ROUTINE MAINTENANCE

To ensure reliable protection, it is important to check and calibrate the detection system on a

regularly scheduled basis. The frequency of these checks is determined by the requirements of

the particular installation.

MANUAL CHECK OF OUTPUT DEVICES

Fault detection circuitry continuously monitors for problems that could prevent proper system

response. It does not monitor external response equipment or the wiring to these devices. It is

important that these devices be checked initially when the system is installed, and periodically

during the ongoing maintenance program.

SYSTEM CHECK IN NORMAL MODE

The system must be checked periodically in the Normal Operating Mode to ensure that those

items not checked by the controller diagnostic circuitry (such as output relays) are functioning

properly.

**CAUTION**

Be sure to secure all output devices actuated by the system to prevent unwanted acti-

vation of this equipment, and remember to place these same output devices back into

service when the checkout is complete.

SENSOR REPLACEMENT

The area must be declassified or power to the sensor must be removed prior to replacing the

sensor in a hazardous area.

11 Enter the Main Menu; momentarily activate the SELECT/RESET reed switch

once the message ‘SrP’ appears on the right digital display

12 Once in the sensor replace mode, the right digital display will continue to show

‘SrP’ and the left digital display will show a channel selection: CH1, CH2, CH3, or

CH4

If the channel that is first displayed corresponds to the senor to be replaced,

momentarily activate the SELECT/RESET reed switch to select that channel. If

the first channel displayed is not the required channel, activate the MENU reed

switch; the left digital display will sequentially display the operational channels

each time the MENU/SET reed switch is activated. Activate the SELECT/RESET

reed switch, once the required channel is displayed.

13 Once the required channel has been selected, the display reads '00' and the

Channel LED and Fault LED are illuminated. The controller is in the Sensor

Replacement Mode.

Once in the Sensor Replacement Mode follow the instructions in the sensor manual for

replacement.

NOTE

If power was removed from the controller during the sensor replacement procedure, the

controller will automatically return to the Normal Mode when power is restored (after a 45

or 90 second time delay). To prevent the possibility of alarms, allow the system to warm

up in the Sensor Replacement Mode.

-33-

An adequate supply of spare sensors should be kept on hand for field replacement. For maximum

protection against contamination and deterioration, they should not be removed from the original

protective packaging until the time of installation.

TROUBLESHOOTING

Table 10 is intended to serve as an aid in locating the cause of a system malfunction. If this table

is not helpful, contact an authorized repair person.

REPLACEMENT PARTS

The Uni-Trol Controller is not designed to be repaired by the customer in the field. If a problem™

should develop, first carefully check for proper wiring, programming and calibration. If it is

determined that the problem is caused by an electronic defect, the device must be returned to the

factory for repair.

NOTE

When replacing a controller, remove power before removing the device from the

enclosure or installing the replacement unit.

The sensor is not intended to be repaired. W hen calibration can no longer be properly performed,

the sensor must be replaced. The frequency of replacement will be determined by the amount and

type of contamination present at the particular installation. An adequate supply of spare sensors

should be kept on hand for field replacement. Always calibrate the sensor after it has been

replaced.

DEVICE REPAIR AND RETURN

The electronics are under full warranty for THREE years (from date of purchase) and the sensors

are under warranty for 2 years. Net Safety Monitoring Inc. supplies all distributors with advance

replacement units. These units are available to the user during the warranty period. This allows

Net Safety Monitoring Inc. to take the time to repair the unit completely while customers keep their

operations running smoothly with the advance replacement unit.

Prior to returning devices or components, contact the nearest local distribution office so that an

RMI (Return Material Identification) number can be assigned. A written statement describing the

malfunction must accompany the returned device or component to expedite finding the cause of

the failure, thereby reducing the time and cost of the repair to the customer. Pack the unit or

component properly. Use sufficient packing material in addition to an anti-static bag or aluminum-

backed cardboard as protection from electrostatic discharge.

-34-

PROBLEM POSSIBLE CAUSE

No Faceplate

indicators illuminated.

< W iring to external power source.

< Input power failure.

FAULT LED on, digital

display blank.

< Power-up time delay (45 seconds).

< If condition continues after 45 seconds, repeat power-up. If a

problem continues, check dip switches or replace detector.

E90 to E97 Status < Initialization failure. Repeat power-up. If successful, re-

program and re-calibrate. If not, replace detector.

E96 Status < Input power problem. Check operation of power source and

power wiring.

E70 Status < External reset activated for over 15 seconds. Check external

switch and wiring.

E40 Status < Sensor input problem. Check sensor and/or transmitter wiring

and calibration.

< Faulty sensor. Replace and calibrate.

< Faulty transmitter. Replace and calibrate.

E30 Status < Negative zero drift. Calibrate sensor.

< Faulty sensor. Replace and calibrate.

< Faulty transmitter. Replace and calibrate.

E20, E21 Status < Calibrate error. Re-calibrate.

E22, E23 Status < Sensor sensitivity out of tolerance. Calibrate transmitter. If

problem continues, replace sensor and calibrate.

E10 Status < Sensor reaching end of life - no problem at present time. Be

prepared to replace sensor at next calibration (calibration

attempt might fail).

Table 10 - Troubleshooting Guide

Appendix A

-35-

Net Safety Monitoring Inc.Electrostatic Sensitive Device Handling Procedure

W ith the trend toward increasingly widespread use of microprocessors and a wide variety of other

electrostatic sensitive semiconductor devices, the need for careful handling of equipment

containing these devices deserves more attention than it has received in the past.

Electrostatic damage can occur in several ways. The most familiar is by physical contact.

Touching an object causes a discharge of electrostatic energy that has built up on the skin. If the

charge is of sufficient magnitude, a spark will also be visible. This voltage is often more than

enough to damage some electronic components. Some devices can be damaged without any

physical contact. Exposure to an electric field can cause damage if the electric field exceeds the

dielectric breakdown voltage of the capacitive elements within the device.

In some cases, permanent damage is instantaneous and an immediate malfunction is realized.

Often, however, the symptoms are not immediately observed. Performance may be marginal or

even seemingly normal for an indefinite period of time, followed by a sudden and mysterious

failure.

Damage caused by electrostatic discharge can be virtually eliminated if the equipment is handled

only in a static safeguarded work area and if it is transported in a package or container that will

render the necessary protection against static electricity. Net Safety Monitoring Inc. modules that

might be damaged by static electricity are carefully wrapped in a static protective material before

being packaged. Foam packaging blocks are also treated with an anti-static agent. If it should

ever become necessary to return the module, it is highly recommended that it be carefully

packaged in the original carton and static protective wrapping.

Since a static safeguarded work area is usually impractical in most field installations, caution

should be exercised to handle the module by its metal shields, taking care not to touch electronic

components or terminals.

In general, always exercise all of the accepted and proven precautions that are normally observed

when handling electrostatic sensitive devices.

A warning label is placed on the packaging, identifying those units that use electrostatic sensitive

semiconductor devices.

*Published in Accordance with E1A

standard 471

-36-

Appendix B

Record Of Dip Switch Settings

DIP SWITCH ON OFF

SW 3.1

SW 3.2

SW 3.3

SW 3.4

SW 3.5

SW 3.6

SW 3.7

SW 3.8

SW 4.1

SW 4.2

SW 4.3

SW 4.4

SW 4.5

SW 4.6

SW 4.7

SW 4.8

SW 5.1

SW 5.2

SW 5.3

SW 5.4

SW 5.5

SW 5.6

SW 5.7

SW 5.8

-37-

Appendix C

Wire Resistance In Ohms

Distance

(Feet)AWG #20 AWG #18 AWG #16 AWG #14 AWG #12 AWG #10 AWG #8

100 1.02 0.64 0.40 0.25 0.16 0.10 0.06

200 2.03 1.28 0.08 0.51 0.32 0.20 0.13

300 3.05 1.92 1.20 0.76 0.48 0.30 0.19

400 4.06 2.55 1.61 1.01 0.64 0.40 0.25

500 5.08 3.20 2.01 1.26 0.79 0.50 0.31

600 6.09 3.83 2.41 1.52 0.95 0.60 0.38

700 7.11 4.47 2.81 1.77 1.11 0.70 0.44

800 8.12 5.11 3.21 2.02 1.27 0.80 0.50

900 9.14 5.75 3.61 2.27 1.43 0.90 0.57

1000 10.20 6.39 4.02 2.53 1.59 1.09 0.63

1250 12.70 7.99 5.03 3.16 1.99 1.25 0.79

1500 15.20 9.58 6.02 3.79 2.38 1.50 0.94

1750 17.80 11.20 7.03 4.42 2.78 1.75 1.10

2000 20.30 12.80 8.03 5.05 3.18 2.00 1.26

2250 22.80 14.40 9.03 5.68 3.57 2.25 1.41

2500 25.40 16.00 10.00 6.31 3.97 2.50 1.57

3000 30.50 19.20 12.00 7.58 4.76 3.00 1.88

3500 35.50 22.40 14.10 8.84 5.56 3.50 2.21

4000 40.60 25.50 16.10 10.00 6.35 4.00 2.51

4500 45.70 28.70 18.10 11.40 7.15 4.50 2.82

5000 50.10 32.00 20.10 12.60 7.94 5.00 3.14

5500 55.80 35.10 22.10 13.91 8.73 5.50 3.46

6000 61.00 38.30 24.10 15.20 9.53 6.00 3.77

6500 66.00 41.50 26.10 16.40 10.30 6.50 4.08

7000 71.10 44.70 28.10 17.70 11.10 7.00 4.40

7500 76.10 47.90 30.10 19.00 12.00 7.49 4.71

8000 81.20 51.10 23.10 20.20 12.70 7.99 5.03

9000 91.40 57.50 36.10 22.70 14.30 8.99 5.65

10 000 102.00 63.90 40.20 25.30 15.90 9.99 6.28

NOTE: RESISTANCE SHOWN IS ONE WAY. THIS FIGURE SHOULD BE DOUBLED WHEN

DETERMINING CLOSED LOOP RESISTANCE.

DISTRIBUTED BY:

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Calgary, Alberta, Canada, T1Y 7J7