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Index

III

Table of ContentsTABLE OF CONTENTS.................................................................................III

INDEX OF FIGURES .................................................................................... IV

INDEX OF TABLES ...................................................................................... IV

INTRODUCTION ........................................................................................... V

INSTALLATION ...........................................................................................1.1

GENERAL.......................................................................................................................................1.1MOUNTING ....................................................................................................................................1.1NETWORK WIRING .......................................................................................................................1.2BUS TOPOLOGY AND NETWORK CONFIGURATION ................................................................1.4

OPERATION................................................................................................2.1

FUNCTIONAL DESCRIPTION – HARDWARE...............................................................................2.1TEMPERATURE SENSOR.............................................................................................................2.3

CONFIGURATION.......................................................................................3.1

TRANDUCER BLOCK ....................................................................................................................3.1HOW CONFIGURE A TRANSDUCER BLOCK ..............................................................................3.1SENSOR TRANSDUCER NUMBER ..............................................................................................3.1SENSOR WIRING ..........................................................................................................................3.2JUMPER ONFIGURATION.............................................................................................................3.2SENSOR CONFIGURATION .........................................................................................................3.3HOW TO CONNECT TWO SENSORS TO TT302 .........................................................................3.5COMPENSATION OF LEAD RESISTANCE FOR RTD or Ohm.....................................................3.6COMPENSATION OF LEAD RESISTANCE FOR RTD or Ohm Double Sensors ..........................3.6CALIBRATION IN TT302 BY THE USER .......................................................................................3.6CHANGING UNITS IN TEMPERATURE SENSORS......................................................................3.6TRANSDUCER DISPLAY – CONFIGURATION.............................................................................3.7DISPLAY TRANSDUCER BLOCK..................................................................................................3.7DEFINITION OF PARAMETERS AND VALUES ............................................................................3.8PROGRAMMING USING LOCAL ADJUSTMENT........................................................................3.11LOCAL PROGRAMMING TREE...................................................................................................3.11

MAINTENCE PROCEDURES......................................................................4.1

TOUBLESANTING..........................................................................................................................4.1DISASSEMBLY PROCEDURE.......................................................................................................4.2REASSEMBLY PROCEDURE........................................................................................................4.2INTERCHANGEABILITY ................................................................................................................4.3RETURNING MATERIALS .............................................................................................................4.3

TECHNICAL CHARACTERISTICS..............................................................5.1

FUNCIONAL SPECIFICATIONS ....................................................................................................5.1PERFORMANCE SPECIFICATIONS .............................................................................................5.2PHYSICAL SPECIFICATIONS .......................................................................................................5.2

TT302 – Fieldbus Temperature Transmitter

IV

Index of FiguresFIGURE 1.1 – COVER LOCKING ........................................................................................................1.2FIGURE 1.2 – GROUND TERMINALS.................................................................................................1.2FIGURE 1.3 – DIMENSIONAL DRAWING AND MOUNTING POSITIONS..........................................1.3FIGURE 1.4 – BUS TOPOLOGY..........................................................................................................1.4FIGURE 1.5 – TREE TOPOLOGY .......................................................................................................1.5

FIGURE 2.1 – TT302 BLOCK DIAGRAM.............................................................................................2.1FIGURE 2.2 – LCD INDICATOR ..........................................................................................................2.2FIGURE 2.3 – TWO-WIRE CONNECTION ..........................................................................................2.4FIGURE 2.4 – TREE – WIRE CONNECTION ......................................................................................2.4FIGURE 2.5 – FOUR WIRE CONNECTION ........................................................................................2.5FIGURE 2.6 – DIFFERENTIAL OR DUAL CONNECTION...................................................................2.5

FIGURE 3.1 – SENSOR WIRING ........................................................................................................3.2FIGURE 3.2 – TEMPERATURE CALIBRATION – TT302....................................................................3.3FIGURE 3.3 – TEMPERATURE CALIBRATION – TT302....................................................................3.3FIGURE 3.4 – TEMPERATURE CALIBRATION – TT302....................................................................3.4FIGURE 3.5 – TEMPERATURE CALIBRATION – TT302....................................................................3.5FIGURE 3.6 – CREATING TRANSDUCER AND FUNCTION BLOCKS ..............................................3.7FIGURE 3.7 – PARAMETERS FOR LOCAL ADJUSTMENT CONFIGURATION ................................3.9FIGURE 3.8 – PARAMETERS FOR LOCAL ADJUSTMENT CONFIGURATION ................................3.9FIGURE 3.9 – PARAMETERS FOR LOCAL ADJUSTMENT CONFIGURATION ..............................3.10FIGURE 3.10 – PARAMETERS FOR LOCAL ADJUSTMENT CONFIGURATION ............................3.10FIGURE 3.11 – PARAMETERS FOR LOCAL ADJUSTMENT CONFIGURATION ............................3.11FIGURE 3.12 – STEP 1 – TT302 .......................................................................................................3.11FIGURE 3.13 – STEP 2 – TT302 .......................................................................................................3.12FIGURE 3.14 – STEP 3 – TT302 .......................................................................................................3.12FIGURE 3.15 – STEP 4 – TT302 .......................................................................................................3.12FIGURE 3.16 – STEP 5 – TT302 .......................................................................................................3.13FIGURE 3.17 – STEP 6 – TT302 .......................................................................................................3.13FIGURE 3.18 – STEP 7 – TT302 .......................................................................................................3.13

FIGURE 4.1 – FOUR POSSIBLE POSITION OF THE DISPLAY.........................................................4.2FIGURE 4.1 – EXPLODED VIEW ........................................................................................................4.3

Index of TablesTABLE 3.1 – SENSOR TYPE TABLE ..................................................................................................3.4TABLE 3.2 – TYPE OF CONNECTION TABLE ...................................................................................3.5TABLE 3.3 – UNIT TABLE ...................................................................................................................3.6

TABLE 4.1 – MESSAGES OF ERRORS AND POTENTIAL CAUSE ...................................................4.1

Introduction

V

IntroductionThe TT302 is from the first generation of FIELDBUS devices. It is a transmitter mainlyintended for measurement of temperature using RTDs or thermocouples, but can alsoaccept other sensors with resistance or mV output such as: pyrometers, load cells,resistance position indicators, etc. The digital technology used in the TT302 enables asingle model to accept several types of sensors, an easy interface between the field andthe control room and several others features that considerably reduces the installation,operation and maintenance costs.

FIELDBUS is not only a replacement for 4-20 mA or intelligent/smart transmitterprotocols. It contains much more. FIELDBUS is a complete system enabling distributionof the control function to equipment in the field.

Some advantages of bi-directional digital communications are known from existing smarttransmitter protocols: higher accuracy, multivariable access, remote configuration anddiagnostics and multi-dropping of several devices on a single pair of wires. Theseprotocols were not intended to transfer control data, but maintain information. Thereforethey were slow and not efficient enough to be used.

The main requirements for Fieldbus were to overcome these problems. Closed loopcontrol with performance like a 4-20 mA system requires higher speed. Since higherspeed means higher power consumption, this clashes with the need for intrinsic safety.Therefore a moderately high communication speed was selected, and the system wasdesigned to have minimum communication overhead. Using scheduling, the systemcontrols the variable sampling, the algorithm execution and the communication tooptimize the usage of the network, thus achieving high closed loop performance.

Using Fieldbus technology, with its capability to interconnect several devices, very largecontrol schemes can be constructed. In order to be user friendly, the function blockconcept was introduced (users of SMAR CD600 should be familiar with this, since it wasimplemented several years ago). The user may now easily build and overview complexcontrol strategies. Another advantage is adding flexibility, the control strategy may beedited without having to rewire or change any hardware.

Now, thanks to Fieldbus, the transmitter accepts two channels, i.e., two measurements.This reduces the cost per channel. Other function blocks are also available. They allowflexibility in control strategy implementation.

The need for Fieldbus implementation in small as well as large systems was consideredwhen developing the entire 302 line of Fieldbus devices. They have the common featuresof being able to act as a master on the network.

Get the best result of the TT302 by carefully reading these instructions.


VI

WARNING

This Manual is compatible with version 3.XX, where 3 denotesoftware version and XX software release. The indication 3.XXmeans that this manual is compatible with any release ofsoftware version 3.

Section 1

1-1

Installation

General

The overall accuracy of temperature and other measurements depends on severalvariables. Although the transmitter has an outstanding performance, proper installation isessential in order to maximize its performance.

Among all factors which may affect transmitter accuracy, environmental conditions arethe most difficult to control. There are, however, ways of reducing the effects oftemperature, humidity and vibration.

Locating the transmitter in areas protected from extreme environmental changes canminimize temperature fluctuation effects.

In warm environments, the transmitter should be installed in such a way as to avoid, asmuch as possible, direct exposure to the sun. Installation close to lines and vesselssubjected to high temperatures should also be avoided. For temperature measurements,sensors with cooling-neck can be used or the sensor can be mounted separately from thetransmitter housing.

Use of sunshades or heat shields to protect the transmitter from external heat sourcesshould be considered.

Humidity is fatal for electronic circuits. In areas subjected to high relative humidity, the O-rings for the electronic housing covers must be correctly placed and the covers must becompletely closed by tightening them by hand until you feel the O-rings beingcompressed. Do not use tools to close the covers. Removal of the electronics cover in thefield should be reduced to the minimum necessary, since each time it is removed, thecircuits are exposed to humidity. The electronic circuit is protected by a humidity proofcoating, but frequent exposure to humidity may affect the protection provided. It is alsoimportant to keep the covers tightened in place. Every time they are removed, the threadsare exposed to corrosion, as painting cannot protect these parts. Code-approved sealingmethods should be employed on conduit entering the transmitter.

Connecting the sensor as close to the transmitter as possible and using proper wires(See Section 2 - Operation), can decrease measurement error.

Mounting

The transmitter may be mounted in two basic ways:

Separated from the sensor, using optional mounting brackets. Mounted on the sensor assembly.

It can be mounted in several different positions using the bracket, as shown in Figure 1.3- Dimensional Drawing and Mounting Positions. As shown in Figure 1.3 - DimensionalDrawing and Mounting Positions one of the conduit inlets for electrical connection is usedto mount the sensor integral to the temperature transmitter.

For better visibility, the digital display may be rotated in steps of 90°. (See Figure 4.1 -Four Possible Positions of the Display).


1-2

Network Wiring

Access the terminal block by removing the Electrical Connection Cover. This cover canbe locked closed by the cover locking screw (See Figure 1.1 - Cover Locking).To releasethe cover, rotate the locking screw clockwise.

Figure 1.1 - Cover Locking

Cable access to wiring connections are obtained by one of the two conduit outlets.Conduit threads should be sealed by means of code-approved sealing methods. Theunused outlet connection should be plugged accordingly.

The wiring block has screws on which fork or ring type terminals can be fastened. (SeeFigure 1.2 - Ground Terminals).

Figure 1.2 - Ground Terminals

For convenience, there are three ground terminals: one inside the cover and twoexternally, located close to the conduit entries.

WARNING

Do not connect the Fieldbus network wires to the sensorterminals. (Terminals 1, 2, 3 and 4).

TT2EM102.CDR

TT2EM101.CDR

Installation

1-3

Figure 1.3 - Dimensional Drawing and Mounting Positions

The TT302 uses the 31.25-kbit/s, voltage mode option for the physical signaling. All otherdevices on the same bus must use the same signaling. All devices are connected inparallel along the same pair of wires.

Various types of Fieldbus devices may be connected on the same bus. The TT302 ispowered via the bus. The limit for such devices is 16 for one bus for non-intrinsically saferequirement.

In hazardous areas, the number of devices may be limited to 6 devices by intrinsicallysafe restrictions.

The TT302 is protected against reverse polarity, and can withstand ±35 VDC withoutdamage.

Use of twisted pair cables is recommended. It is also recommended to ground shield ofshielded cables at one end only. The non-grounded end must be carefully isolated.

NOTE

Please refer to the General Installation, Operation and MaintenanceManual for more details.

TT2EM103.CDR


1-4

Bus Topology and Network Configuration

WARNING

HAZARDOUS AREASIn hazardous zones with explosion proof requirements thecovers must be tightened with at least 7 turns. In order to avoidmoisture or corrosive gases, hand tighten the covers until the O-rings are compressed. Lock the covers closed with the lockingscrew.

In hazardous zones with intrinsically safe or non incendiverequirements, the circuit entity parameters and applicableinstallation procedures must be observed.

Cable access to wiring connections is obtained by the twoconduit outlets. Conduit threads should be sealed by means ofcode-approved sealing methods. The unused outlet connectionshould be plugged and sealed accordingly.

Should other certifications be necessary, refer to the certificationor specific standard for installation limitations.

The connection of couplers should be kept at less than 15 per 250 m.

Figure 1.4 - Bus Topology

TT2EM104.CDR

Installation

1-5

Figure 1.5 - Tree Topology

TT2EM105.CDR


1-6

Section 2

2-1

OperationThe TT302 accepts signals from mV generators such as thermocouples or resistivesensors such as RTDs. The criterion is that the signal is within the range of the input. FormV, the range is -50 to 500 mV and for resistance, 0-2000 Ohm.

Functional Description - Hardware

The function of each block is described below.

Figure 2.1 - TT302 Block Diagram

MUX MultiplexerThe MUX multiplexes the sensor terminals to the signal conditioning section ensuring thatthe voltages are measured between the correct terminals.

Signal ConditionerIts function is to apply the correct gain to the input signals to make them suit the A/D -converter.

A/D ConverterThe A/D converts the input signal to a digital format for the CPU.

Signal IsolationIts function is to isolate the control and data signal between the input and the CPU.

TT2EM201.CDR


2-2

(CPU) Central Processing Unit, RAM, PROM and EEPROMThe CPU is the intelligent portion of the transmitter, being responsible for themanagement and operation of measurement, block execution, self-diagnostics andcommunication. The program is stored in a PROM. For temporary storage of data there isa RAM. The data in the RAM is lost if the power is switched off. However there is anonvolatile EEPROM where data that must be retained is stored. Examples, of such dataare trim, calibration, block configuration and identification data.

Communication ControllerIt monitors line activity, modulates and demodulates communication signals and insertsand deletes start and end delimiters.

Power SupplyTakes power of the loop-line to power the transmitter circuitry.

Power IsolationJust like the signals to and from the input section, the power to the input section must beisolated. Isolation is achieved by converting the DC supply into a high frequency ACsupply and galvanically separating it using a transformer.

Display ControllerReceives data from the CPU informing which segments of the Liquid Crystal Display,should be turned on.

Local AdjustmentThere are two switches that are magnetically activated. They can be activated by themagnetic tool without mechanical or electrical contact.

Figure 2.2 - LCD Indicator

TT2EM202.CDR

Operation

2-3

Temperature Sensors

The TT302, as previously explained, accepts several types of sensors. The TT302 isspecially designed for temperature measurement using thermocouples or ResistiveTemperature Detectors (RTDs).

Some basic concepts about these sensors are presented below.

ThermocouplesThermocouples are constructed with two wires made from different metals or alloysjoined at one end, called measuring junction or "hot junction". The measuring junctionshould be placed at the point of measurement. The other end of the thermocouple isopen and connected to the temperature transmitter. This point is called reference junctionor cold junction.

For most applications, the Seebeck effect is sufficient to explain thermocouple behavioras following:

How the Thermocouple Works (Seebeck Effect)When there is a temperature difference along a metal wire, a small electric potential,unique to every alloy, will occur. This phenomenon is called Seebeck effect. When twowires of dissimilar metals are joined at one end, and left open at the other, a temperaturedifference between the two ends will result in a voltage since the potentials generated bythe dissimilar materials are different and do not cancel each other out. Now, twoimportant things must be noted. First: the voltage generated by the thermocouple isproportional to the difference between the measuring-junction and the cold junctiontemperatures. Therefore the temperature at the reference junction must be added to thetemperature derived from the thermocouple output, in order to find the temperaturemeasured. This is called cold junction compensation, and is done automatically by theTT302, which has a temperature sensor at the sensor terminals for this purpose.Secondly, if the thermocouple wires are not used, all the way to the terminals of thetransmitter (e.g., copper wire is used from sensor-head or marshaling box) will form newjunctions with additional Seebeck effects. It will be created and ruin the measurement inmost cases, since the cold-junction compensation will be done at the wrong point.

NOTE

Use thermocouple wires or appropriate extension wires all the wayfrom sensor to transmitter.

The relation between the measuring junction temperature and the generated mili-voltageis tabulated in thermocouple calibration tables for standardized thermocouple types, thereference temperature being 0°C.

Standardized thermocouples that are commercially used, whose tables are stored in thememory of the TT302, are the following:

NBS (B, E, J, K, N, R, S & T) DIN (L & U)

Resistive Temperature Detectors (RTDs)Resistance Temperature Detectors, most commonly known as RTD’s, are based on theprinciple that the resistance of metal increases as its temperature increases.Standardized RTDs, whose tables are stored in the memory of the TT302, are thefollowing:

JIS [1604-81] (Pt50 & Pt100) IEC, DIN, JIS [1604-89] (Pt50, Pt100 & Pt500) GE (Cu10) DIN (Ni120)


2-4

For correct measurement of RTD temperature, it is necessary to eliminate the effect ofthe resistance of the wires connecting the sensor to the measuring circuit. In someindustrial applications, these wires may be hundreds of meters long. This is particularlyimportant at locations where the ambient temperature changes constantly.

The TT302 permits a 2-wire connection that may cause measuring errors, depending onthe length of connection wires and on the temperature to which they are exposed. (SeeFigure 2.3 - Two-Wire Connection).

In a 2-wire connection, the voltage V2 is proportional to the RTD resistance plus theresistance of the wires.

V2 = [RTD + 2 x R] x I

Figure 2.3 - Two-Wire Connection

In order to avoid the resistance effect of the connection wires, it is recommended to use a3-wire connection (See Figure 2.4 - Three – Wire Connection) or a 4-wire connection(See Figure 2.5 - Four - Wire Connection).

In a 3-wire connection, terminal 3 is a high impedance input. Thus, no current flowsthrough that wire and no voltage drop is caused. The voltage V2-V1 is independent of thewire resistances since they will be cancelled, and is directly proportional to the RTDresistance alone.

V2-V1 = [RTD + R] x I - R x I = RTD x I

Figure 2.4 - Three – Wire Connection

TT2EM204.CDR

TT2EM203.CDR

Operation

2-5

In a 4-wire connection, terminals 2 and 3 are high impedance inputs. Thus, no currentflows through those wires and no voltage drop is caused. The resistance of the other twowires is not of interest, since there is no measurement registered on them. Hence thevoltage V2 is directly proportional to the RTD resistance.(V2 = RTD x I)

Figure 2.5 - Four - Wire Connection

A differential or dual channel connection is similar to the two-wire connection and givesthe same problem (See Figure 2.6 - Differential or Dual Connection). The resistance ofthe wires will be measured and do not cancel each other out in a temperaturemeasurement, since linearization will affect them differently.

Figure 2.6 - Differential or Dual Connection

TT2EM206.CDR

TT2EM205.CDR


2-6

Section 3

3-1

ConfigurationOne of the many advantages of Fieldbus is that device configuration is independent ofthe configurator. The TT302 may be configured by a third party terminal or operatorconsole. Any particular configurator is therefore not addressed here.

The TT302 contains two input transducer blocks, one resource block, one displaytransducer block and other function blocks.

For explanation and details of function blocks, see the “Function Blocks Manual”.

Transducer Block

Transducer block insulates function blocks from the specific I/O hardware, such assensors, actuators. Transducer block controls access to I/O through manufacturerspecific implementation. This permits the transducer block to execute as frequently asnecessary to obtain good data from sensors without burdening the function blocks thatuses the data. It also insulates the function block from the manufacturer specificcharacteristics of certain hardware.

By accessing the hardware, the transducer block can get data from I/O or passing controldata to it. The connection between Transducer block and Function block is calledchannel. These blocks can exchange data from its interface.

Normally, transducer blocks perform functions, such as linearization, characterization,temperature compensation, control and exchange data to hardware.

How to Configure a Transducer Block

The transducer block has an algorithm, a set of contained parameters, it means, you arenot able to link these parameters to other blocks and publish the link via communication,and a channel connecting it to a function block.

The algorithm describes the behavior of the transducer as a data transfer functionbetween the I/O hardware and other function block. The set of contained parametersdefines the user interface to the transducer block. They can be divided into Standard andManufacturer Specific.

The standard parameters will be present for such class of device, as pressure,temperature, actuator, etc., whatever is the manufacturer. Oppositely, the manufacturersspecific ones are defined only for its manufacturer. As common manufacturer specificparameters, we have calibration settings, material information, linearization curve, etc.

When you perform a standard routine such as calibration, you are conducted step by stepby a method. The method is generally defined as guideline to help the user to makecommon tasks. The SYSCON identifies each method associated to the parameters andenables the interface to it.

Sensor Transducer Number

The Sensor Transducer Number associates the sensor to the transducer. It can be set toone up to two, in case of dual sensor.


3-2

Sensor Wiring

The TT302 accepts up to two sensors and may operate in one of three modes:

Single channel single sensor measurement Dual channel dual sensor measurement Single channel dual sensor differential measurement. Single channel dual sensor backup measurement.

NOTE

Avoid routing sensor wiring close to power cables or switchingequipment.

In accordance with connection and sensor types, the terminal blocks shall be wired asshown on the figure below (See Figure 3.1 - Sensor Wiring).

Figure 3.1 - Sensor Wiring

Jumper Configuration

In order to work properly, the jumpers J1 and J3 located in the TT302 main board mustbe correctly configured.

J1 is responsible to enable the AI block simulate mode.

W1 is responsable to enable the local adjustment.

TT2EM301.CDR

Configuration

3-3

Sensor Configuration

It is necessary to configure the transducer number allocated to its task. The parameterSENSOR_TRANSDUCER_NUMBER should be configured to 1.

Figure 3.2 - Temperature Calibration - TT302

It is possible to configure connection and sensor type by means of parametersSENSOR_TYPE and SENSOR_CONNECTION. The connection and sensor typesavailable are listed in the tables Table 3.1 - Sensor Type Table and Table 3.2 - Type ofConnection Table, as well as the corresponding value.


NOTE

There are no 3 or 4 wire connections for mile-voltage sensors.

This parameter couldbe 1 or 2, for indicatingrespectively first orsecond transducers.

This parametersets the transducernumber, accordingto the type oftemperaturemeasurement.

TT2EM302.CDR

This list contains:

Thermocouples,RTDs, Ohm andMilivoltage.

This parameterselects the type ofsensor attached tothe TT302 in orderto measuretemperature.

TT2EM303.CDR


3-4


SENSOR_TYPE

Pt 100 IEC

Pt 100 JIS

Pt 500 IEC

Ni 120 DIN

Cu 10 CE

Pt 50 IEC

Pt 50 JIS

Ohm 100

Ohm 400

Ohm 2,000

TC B NBS

TC E NBS

TC J NBS

TC K NBS

TC N NBS

TC R NBS

TC S NBS

TC T NBS

TC L DIN

TC U DIN

mV 22

mV 100

mV 500

Table 3.1 - Sensor Type Table

This list containsthe number ofwires available foreach type ofsensor.

This parameterselects the type ofsensor connection.The options herewill depend onSensor Typechosen asdescribed above.

TT2EM304.CDR

Configuration

3-5

CONNECTION

DOUBLE TWO WIRE

TWO WIRE

THREE WIRE

FOUR WIRE

Table 3.2 - Type of Connection Table

How to Connect Two Sensors

Transmitter series TT302 are capable of operating simultaneously with two sensors,using two transducer blocks, if necessary. Configuration types in two sensors operationare as follows:

Differential – In this case there is only one transducer. Transducer output is thedifference between the readout of sensor 1 (between terminals 3 and 4) and the readoutof sensor 2 (between terminals 2 and 4).

Backup – In this case there is only one transducer.Should the first sensor (between terminals 3 and 4) open, the second sensor (betweenterminals 2 and 4) will supply the signal to the transducer.

Double - In this case there are two transducers. Each sensor provides a signal to itsrespective transducer.

In order to be able to operate with sensors in the backup or differential modes, the usershall actuate parameter PRIMARY_VALUE_TYPE. In order to operate with doublesensors, the user shall actuate parameter SENSOR_CONNECTION.


This list contains theSimple, Backup andDifferential type oftemperaturecalculation.

This parameter setsthe type ofcalculation sh ouldbe done for eachtransducer.

TT2EM305.CDR


3-6

Compensation of Lead Resistance for RTD or Ohm

When 2 - wire resistive sensors are used, the readout is not a very accurate because ofthe resistance of leads connecting sensor to transmitter. In order to reduce this error, it ispossible to configure the transmitter to compensate for a constant lead resistance bymeans of parameter LEAD_RESISTANCE_VALUE.

Compensation of lead resistance for RTD or Ohm Double Sensors

As explained above, 2 – wire resistive sensors are not accurate due to lead resistance.For this reason, 3 or 4 wire sensors are usually preferred.With TT302 is possible to connect two sensors to the terminal block. Due to spacelimitations in the terminal block, it is only possible to connect two 2-wire sensors. In orderto optimize lead resistance compensation for these sensors and to minimize error, thereis the parameter LEAD_RESISTANCE_VALUE that automatically calculates the leadresistance. All the user is required to do is to short-circuit the sensor in the field and toactuate this parameter.

Calibration in TT302 by the User

The electronics of TT302 is very stable in time, not requiring further calibrations aftermanufacturer’s calibration. However, should the client decide to use his reference tocalibrate the TT302 (which is not recommendable), this may be done by means ofparameters CAL_POINT_LO and CAL_POINT_HI. When trim is performed, always usetwo points as reference; never consider only one point as a reference.

NOTE

Every time the sensor is altered, TRIM values are reset.

In the case of TC it is necessary to disable the cold junction compensation before startingcalibration procedures.

Trim is not available for TT using two sensors.

Changing Units in Temperature Sensors

The following units are available for temperature sensors: Celsius, Rankine, Kelvin andFahrenheit. The units values are shown in Table 3.3 - Unit Table.

The unit can be changed in the AI block by the parameter XD_SCALE.

UNIT VALUE

KELVIN 1000

CELSIUS 1001

FAHRENHEIT 1002

RANKINE 1003

Table 3.3 - Unit Table

Configuration

3-7

Transducer Display – Configuration

Using the SYSCON is possible to configure the Display Transducer block. As the namedescribed it is a transducer due the interfacing of its block with the LCD hardware.The Transducer Display is treated as a normal block by SYSCON. It means, this blockhas some parameters can be configured according to customer's needs. (See the Figure3.6 – Creating Transducers and Function Blocks).

The user can choose the parameters to be shown at LCD display, they can beparameters just for monitoring purpose or for acting locally in the field devices by using amagnetic tool.

Figure 3.6 – Creating Transducers and Function Blocks

Display Transducer Block

The local adjustment is completely configured by SYSCON. It means, the user can selectthe best options to fit his application. From factory, it is configured with the options to setthe Upper and Lower trim, for monitoring the input transducer output and check the Tag.Normally, the transmitter is much better configured by SYSCON, but the localfunctionality of the LCD permits an easy and fast action on certain parameters, since itdoes not rely on communication and network wiring connections. Among the possibilitiesby Local Adjustment, the following options can be emphasized: Mode block, Outputsmonitoring, Tag visualization and Tuning Parameters setting.

TT2EM306.CDR


3-8

The interface between the user is described very detailed on the "General Installation,Operation and Maintenance Procedures Manual". Please take a detailed look in thatmanual in the chapter related to "Programming Using Local Adjustment". The resourceson the transducer display, as well as for all the Series 302 field devices from SMAR, hasthe same methodology to handle with it. So, since the user has learned once, he iscapable to handle all kind of field devices from SMAR.

All function block and transducers defined according Foundation Fieldbus have adescription of their features written on binary files, by the Device Description Language.

This feature permits that third parties configurator enabled by Device Description Servicetechnology can interpret these features and make them accessible to configure. TheFunction Blocks and Transducers of Series 302 have been defined rigorously accordingthe Foundation Fieldbus specifications in order to be interoperable to other parties.

In order to able the local adjustment using the magnetic tool, it is necessary to previouslyprepare the parameters related with this operation via SYSCON (System Configuration).The Figure 3.7 - Parameters for Local Adjustment Configuration and the Figure 3.8 -Parameters for Local Adjustment Configuration show all parameters and their respectivevalues, which shall be configured in accordance with then necessity of being locallyadjusted by means of the magnetic tool. All values shown on the display are defaultvalues.

There are seven groups of parameters, which may be pre-configured by the user in orderto able, a possible configuration by means of the local adjustment. As an example, let’ssuppose that you don’t want to show some parameters; in this case, simply write aninvalid Tag in the parameter, Block_Tag_Param_X. Doing this, the device will not takethe parameters related (indexed) to its Tag as a valid parameters.

Definition of Parameters and Values

Block_Tag_ParamThis is tag of the block to which the parameter belongs. Use up to a maximum of 32characters.

Index_RelativeThis is the index related to the parameter to be actuated or viewed (0, 1, 2…). Refer tothe "Function Blocks Manual" to know the desired indexes, or visualize them on theSYSCON by opening the desired block.

Sub_IndexIn case you wish to visualize a certain tag, opt for the index relative equal to zero, and forthe sub-index equal to one (refer to paragraph Structure Block in the Function BlocksManual).

MnemonicThis is the mnemonic for the parameter identification (it accepts a maximum of 16characters in the alphanumeric field of the display). Choose the mnemonic, preferablywith no more than 5 characters because, this way, it will not be necessary to rotate it onthe display.

Inc_DecIt is the increment and decrement in decimal units when the parameter is Float or FloatStatus time, or integer, when the parameter is in whole units.

Decimal_Point_Numb.This is the number of digits after the decimal point (0 to 3 decimal digits).

AccessThe access allows the user to read, in the case of the “Monitoring” option, and to writewhen "action" option is selected, then the display will show the increment and decrementarrows.

Configuration

3-9

Alpha_NumThese parameters include two options: value and mnemonic. In option value, it ispossible to display data both in the alphanumeric and in the numeric fields; this way, inthe case of a data higher than 10000, it will be shown in the alphanumeric field.In option mnemonic, the display may show the data in the numeric field and themnemonic in the alphanumeric field.

In case you wish to visualize a certain tag, opt for the index relative equal to zero, and forthe sub-index equal to one (refer to paragraph Structure Block in the Function BlocksManual).

Figure 3.7 - Parameters for Local Adjustment Configuration


TT2EM307.CDR

TT2EM308.CDR


3-10



TT2EM309.CDR

TT2EM310.CDR

Configuration

3-11


Programming Using Local Adjustment

The transmitter has two holes for magnetic switches activated by the magnetic toollocated under the identification plate.

This magnetic tool enables adjustment of the most important parameters of the blocks.

The jumper W1 on top of the main circuit board must be in place for this function to beenabled and the transmitter must be fitted with the digital display for access to the localadjustment. Without the display the local adjustment is not possible.

Local Programming Tree

Figure 3.12 - Step 1 - TT302

The option "update"should be selected inorder to execute theupgrade of localadjustment programmingtree.

After its step all theparameters selected willbe show on the LCDdisplay.

This parameterupdates the localadjustmentprogramming treeconfigured on eachdevice.

TT2EM311.CDR

TT2EM312.CDR

Place the magnetictool in orifice S andwait during 5seconds.

In order to start thelocal adjustment,place the magnetictool in orifice Z andwait until letters MDare displayed.


3-12




TT2EM313.CDR

Insert themagnetic tool inorifice S oncemore and LOCADJ should bedisplayed.

Remove themagnetic toolfrom orifice S.

TT2EM314.CDR

In this option thefirst variable(P_VAL) isshowed with itsrespecteve value(if you to want thatit keep static, putthe tool in S orificeand stay there.

Place the magnetic toolin orifice Z. In case thisis the first configuration,the option shown on thedisplay is the TAG withits correspondingmnemonic configuredby the SYSCON.Otherwise, the optionshown on the displaywill be the oneconfigured in the prioroperation. By keepingthe tool inserted in thisorifice, the localadjustment menu willrotate.

TT2EM315.CDR

In order to decrementthe lower value, placethe magnetic tool inorifice Z to shift thearrow to the downwardposition and then, byinserting and keepingthe tool in orifice S, it ispossible to decrementthe lower value.

In order to range thelower value(lower),simply insert themagnetic tool inorifice S as soon asLOWER is shown onthe display. An arrowpointing upward ( )increments the valveand an arrow pointingdownward ( )decrements thevalue. In order toincrement the value,keep the tool insert inS up to set the valuedesired.

Configuration

3-13




TT2EM316.CDR

In order todecrement theupper value, placethe magnetic tool inorifice Z to shift thearrow to thedownward positionan then, byinsetting andkeeping the tool inorifice S, it ispossible todecrement theupper value.

In order to range theupper value(upper),simply insert themagnetic tool in orificeS as soon as upper isshown on the display.An arrow pointingupward (↑↑↑↑) incrementthe value and an arrowpointing downward (↓↓↓↓)decrements the value.In order to incrementthe value, keep the toolinsert in S up to set thevalue desired.

TT2EM317.CDR

In order todecrement theupper value, placethe magnetic tool inorifice Z to shift thearrow to thedownward positionan then, by insettingand keeping the toolin orifice S, it ispossible todecrement theupper value.

In order to configure theconnection(CONN),simply insert the magnettool in orifice S as soonas CONN is shown onthe display. An arrowpointing upward ( )increment the value andan arrow pointingdownward ( ) decrementthe value. The numberover CONN mnemonic isthe value correspondingof the table xx. See it todo the correct choice ofthe connection value.

TT2EM318.CDR

In order to decrementthe upper value,place the magnetictool in orifice Z toshift the arrow to thedownward positionan then, by insettingand keeping the toolin orifice S, it ispossible todecrement the uppervalue.

In order to configurethe connection(TYPE),simply insert themagnet tool in orifice Sas soon as TYPE isshown on the display.An arrow pointingupward ( ) incrementthe value and an arrowpointing downward ( )decrement the value.The number overTYPE is the valuecorresponding of thetable YY. See it to dothe correct choice ofthe connection value.


3-14

Section 4

4-1

Maintenance Procedures

Troubleshouting

SMAR TT302 transmitters are extensively tested and inspected before delivery to the enduser. Nevertheless, during their design and development, consideration was given to thepossibility of repairs being made by the end user, if necessary.

In general, it is recommended that end users do not try to repair printed circuit boards.Spare circuit boards may be ordered from SMAR whenever necessary.

SYMPTOM PROBABLE SOURCE OF PROBLEM

Transmitter ConnectionsCheck wiring polarity and continuity.Check for shorts or ground loops.Check if the power supply connector is connected to main board.Check if the shield is not used as a conductor.It should be grounded at one end only. Power Supply

Check power supply output. The voltage must be between 9 - 32 VDC at the TT302 terminals. Noiseand ripple should be within the following limits:

a) 16 mV peak to peak from 7.8 to 39 KHz.b) 2 V peak to peak from 47 to 63 Hz for non-intrinsic safety applications and 0.2 V for intrinsic safetyapplications.c) 1.6 V peak to peak from 3.9 MHz to 125 MHz. Network Connection

Check that the topology is correct and all devices are connected in parallel.Check that two Terminators are OK and correctly positioned.Check that the Terminators are according to the specifications.Check length of trunk and spurs.Check spacing between couplers. Network Configuration

Make sure the device tag is configured if system configuration is desidered.Make sure that device address, connection and index for all variables are configured correctly if pre-configuration is used.

NO COMMUNICATION

Electronic Circuit FailureCheck the main board for defect by replacing it with a spare one. Transmitter Connections

Check for intermittent short circuits, open circuits and grounding problems.Check if the sensor is correctly connected to the TT302 terminal block.Check if the sensor signal is reaching the TT302 terminal block by measuring it with a multimeter at thetransmitter- end. For mV and thermocouples test can be done with connected and disconnected to thetransmitter. Noise, Oscillation

Adjust dampingCheck grounding of the transmitters housing, extra important for mV and thermocouple input.Check the terminal block for moisture.Check that the shielding of the wires between sensor/transmitter and transmitter / panel is groundedonly in one end.

INCORRECT READING

SensorCheck the sensor operation; it shall be within its characteristics.Check sensor type; it shall be the type and standard that the TT302 has been configured to.Check if process is within the range of the sensor and the TT302. Electronic Circuit Failure

Check the integrity of circuit replacing it with a spare one.INCORRECT READING

Transmitter ConfigurationCheck if the sensor and wires configuration are correct.

Table 4.1 - Messages of Errors and Potential Cause


4-2

Disassembly Procedure

Refer to Figure 4.2 - Exploded View. Make sure to disconnect the power supply beforedisassembling the transmitter.

SensorIf the sensor is mounted on the transmitter, first disconnect the wires in order to preventthe wires from breaking. To access the terminal block, first loosen the cover lockingscrew on the side marked “Field Terminals”, then unscrew the cover.

Electronic CircuitsThe main board (5) and input board (7) are matched pairs and must be changed togetherand not mixed with others. To remove the circuit boards (5 and 7) and display (4), firstloosen the cover locking (8) on the side not marked “Field Terminals” then unscrew thecover (1).

Loosen the two screws (3) that anchors the display and the main circuit board. Gently pullout the display, and then the main board (5). To remove the input board (7), first unscrewthe two screws (6) that anchors it to the housing (9), gently pull out the board.

WARNING

The boards have CMOS components, which may be damagedby electrostatic discharges. Observe correct procedures forhandling CMOS components. It is also recommended to storethe circuit boards in electrostatic-proof cases.

Reassembly Procedure

• Put input board (7) into housing (9).• Anchor input board with its screws (6).• Put main board (5) into the housing, ensuring all inter connecting pins are connected.• Put display (4) into the housing, observing the four mounting positions (See Figure

4.1 - Four Possible Positions of the Display) “_” should point in the direction desiredas UP.

• Anchors main board and display with their screws (3).• Fit the cover (1) and lock it using the locking screw (8).

Figure 4.1 - Four Possible Positions of the Display

TT2EM401.CDR


4-3

Interchangeability

The Main and Input boards must be kept together because of the calibration data that isstored in the main board EEPROM. In the case of one board being faulty, both must bereplaced.

Returning Materials

Should it become necessary to return the transmitter to SMAR, simply contact your localagent or SMAR office, informing the defective instrument’s serial number, and return it toour factory.

In order to expedite analysis and solution of the problem, the defective item should bereturned with a description of the failure observed, with as many details as possible.Other information concerning the instruments operation, such as service and processconditions, are also helpful.

Figure 4.2 - Exploded View

ACCESSORIES

ORDERING CODE DESCRIPTION

SD1 Magnetic Tool for Local Adjustment

BC1 Fieldbus/RS232 Interface

SYSCON System Configurator

PS302 Power Supply

BT302 Terminator

PCI Process Control Interface

Table 4.2 - Accessories of SYSTEM 302

TT2EM402.CDR


4-4

SPARE PARTS LIST

DESCRIPTION OF PARTS POSITION CODE

HOUSING, Aluminum (NOTE 2)

. ½ - 14 NPT 9 314-0130

. M20 x 1.5 9 314-0131

. PG 13.5 DIN 9 314-0132

HOUSING, 316 SS (NOTE 2)

. ½ - 14 NPT 9 314-0133

. M20 x 1.5 9 314-0134

. PG 13.5 DIN 9 314-0135

COVER (INCLUDES O'RING)

. Aluminum 1 and 15 204-0102

. 316 SS 1 and 15 204-0105

COVER WITH WINDOW FOR INDICATION (INCLUDES O’RING)

. Aluminum 1 204-0103

. 316 SS 1 204-0106

COVER LOCKING SCREW 8 204-0120

EXTERNAL GROUND SCREW 13 204-0124

IDENTIFICATION PLATE FIXING SCREW 11 204-0116

DIGITAL INDICATOR 4 214-0108

TERMINAL INSULATOR 12 304-0123

MAIN INPUT CIRCUIT BOARD ASSEMBLY 5 and 7 304-0155

O’RINGS (NOTE 3)

. Cover, Buna-N 2 204-0122

TERMINAL HOLDING SCREW.

. Housing in Aluminum 14 304-0119

. Housing in 316 Stainless Steel 14 204-0119

MAIN BOARD SCREW HOUSING IN ALUMINUM

. Units with indicator 3 304-0118

. Units without indicator 3 304-0117

MAIN BOARD SCREW HOUSING IN 316 STAINLESS STEEL

. Units with indicator 3 204-0118

. Units without indicator 3 204-0117

INPUT BOARD SCREW

. Housing in Aluminum 6 304-0125

. Housing in 316 Stainless Steel 6 204-0125

MOUNTING BRACKET FOR 2” PIPE MOUNTING (NOTE 4)

. Carbon Steel - 304-0801

. Stainless Steel 316 - 204-0802

. Carbon Steel bolts, nuts, washers and U-clamp in Stainless Steel - 204-0803

LOCAL ADJUSTMENT PROTECTION CAP 10 204-0114

Table 4.3 - Spare Part List


4-5

NOTE

1. For category A, it is recommended keep, in stock, 25 partsinstalled for each set, anf for category B, 50.

2. It includes Terminal holder insulator, bolts (cover lock,grounding and terminal holder insulator) and identificationplate without certification.

3. 0-Rings are packaged in packs of 12 units.4. Including U-clamp, nuts, bolts and washers.


4-6

Section 5

5-1

Technical Characteristics

Functional Specifications

Inputs SignalOptions see following table.

Output SignalDigital only. Foundation Fieldbus 31.25 kbit/s voltage mode with bus power.

Power SupplyBus power: 9 to 32 V DC.Current consumption: quiescent 12 mA.Output impedance: non-intrinsic safety from 7.8 kHz to 39 kHz should be greater or equalto 3 kOhm.Intrinsic safety output impedance (assuming an IS barrier in the power supply) from 7.8kHz to 39 kHz should be greater or equal to 400 Ohm.

IndicationOptional 4½ digit numeric and 5-character alphanumeric LCD indicator.

Hazardous Location CertificationExplosion proof, weather proof and intrinsically safe CENELEC and FM standards.

Temperature LimitsOperation: -40 to 85º C (-40 to 185º F)Storage: -40 to 120º C (-40 to 250º F)Display: -10 to 60º C (-14 to 140º F) operation

-40 to 85º C (-40 to 185º F) without damage

Humidity Limits10 to 100% RH

Turn-on TimeApproximately 10 seconds.

Update TimeApproximately 0.5 second.

ConfigurationBasic configuration may be done using local adjustment magnetic tool if device is fittedwith display. Complete configuration is possible using remote configurator (Ex.:SYSCON).


5-2

Performance Specifications

AccuracySee the following tables.

Ambient Temperature EffectFor a 10 ºC variation:

mV (-6...22 mV), TC (NBS: B, R, S, T): ±0.03% of reading or 0.002 mV whichever isgreater.

mV (-10...100 mV), TC (NBS: E, J, K, N; DIN: L, U): ±0.03% of reading or 0.01 mVwhichever is greater.

mV (-50...500 mV): ±0.03% of reading or 0.05 mV whichever is greater.

Ohms (0...100), RTD (GE: Cu10) : ±0.03% of reading or 0.01 whichever is greater.

Ohms (0...400), RTD (DIN: Ni120; IEC: Pt50, Pt100; JIS: Pt50, Pt100): ±0.03% of readingor 0.04 whichever is greater.

Ohms (0...2000), RTD (IEC: Pt500): ±0.03% of reading or 0.2 whichever is greater.

TC:Cold-junction compensation rejection 60:1 Reference: 25,0 ± 0,3C.

Vibration EffectMeets SAMA PMC 31.1.

Electro-Magnetic Interference EffectDesigned to comply with IEC 801.

Physical Specifications

Electrical Connection1/2-14 NPT, Pg 13.5 or M20 x 1.5 metric.

Material of ConstructionInjected low copper aluminum with polyester painting or 316 Stainless Steel housing, withBuna N 0-rings on covers (NEMA 4X, IP67).

MountingCan be attached directly to the sensor. With an optional bracket can be installed on a 2"pipe or fixed on a wall or panel.

WeightWithout display and mounting bracket: 0.80 kg.Add for digital display: 0.13 kg.Add for mounting bracket: 0.60 kg.


5-3

2, 3 or 4 WIRES DIFFERENTIAL

SENSOR TYPE RANGE (°°°°C) RANGE (F) MINIMUMSPAN (°°°°C)

ACCURACY(°°°°C)

RANGE (°°°°C) RANGE (F) MINIMUMSPAN (°°°°C)

ACCURACY(°°°°C)

Cu10 GE -20 to 250 -4 to 482 50 ±1.0 -270 to 270 -454 to 518 50 ±2.0

Ni 120 DIN -50 to 270 -58 to 518 5 ±0.1 -320 to 320 -544 to 608 5 ±0.5

Pt50 IEC -200 to 850 -328 to 1562 10 ±0.25 -1050 to 1050 -1858 to 1922 10 ±1.0

Pt100 IEC -200 to 850 -328 to 1562 10 ±0.2 -1050 to 1050 -1858 to 1922 10 ±1.0

Pt500 IEC -200 to 450 -328 to 842 10 ±0.25 NA NA NA NA

Pt50 JIS -200 to 600 -328 to 1112 10 ±0.25 -850 to 850 -1498 to 1562 10 ±1.0

RTD

Pt100 JIS -200 to 600 -328 to 1112 10 ±0.25 -800 to 800 -1408 to 1472 10 ±1.5

B NBS +100 to 1800 +212 to 3272 50 ±0.5* -1600 to 1600 -2848 to 2912 60 ±1.0*

E NBS -100 to 1000 -148 to 1832 20 ±0.2 -1100 to 1100 -1948 to 2012 20 ±1.0

J NBS -150 to 750 -238 to 1382 30 ±0.3 -900 to 900 -1588 to 1652 30 ±0.6

K NBS -200 to 1350 -328 to 2462 60 ±0.6 -1550 to 1550 -2758 to 2822 60 ±1.2

N NBS -100 to 1300 -148 to 2372 50 ±0.5 -1400 to 1400 -2488 to 2552 50 ±1.0

R NBS 0 to 1750 32 to 3182 40 ±0.4 -1750 to 1750 -3118 to 3182 40 ±2.0

S NBS 0 to 1750 32 to 3182 40 ±0.4 -1750 to 1750 -3118 to 3182 40 ±2.0

T NBS -200 to 400 -328 to 752 15 ±0.15 -600 to 600 -1048 to 1112 15 ±0.8

L DIN -200 to 900 -328 to 1652 35 ±0.35 -1100 to 1100 -1948 to 2012 35 ±0.7

THERMO-COUPLE

U DIN -200 to 600 -328 to 1112 50 ±0.5 -800 to 800 -1408 to 1472 50 ±2.5

* Not applicable Bellow 440 CNA Not applicable.

Table 5.1 - Sensor Type Chsracteristic

SENSOR RANGE mV MINIMUM SPAN mV DIGITAL * ACCURACY %

-6 to 22 0.40 ±0.02% or ±2 V

-10 to 100 2.00 ±0.02% or ±10 VmV

-50 to 500 10.00 ±0.02% or ±50 V

-28 to 28 0.40 ±0.1% or ±10 VmV DIF.

-110 to 110 2.0 ±0.1% or ±50 V

0 to 100 1 ±0.02% or ±0.01 Ohm

0 to 400 4 ±0.02% or ±0.04 OhmOHM

0 to 2000 20 ±0.02% or ±0.20 Ohm

-100 to 100 1 ±0.08% or ±0.04 OhmOHM DIF.

-400 to 400 4 ±0.1% or ±0.2 Ohm

Table 5.2 - Ohm and mV Characteristic


5-4

MODELTT302 TEMPERATURE TRANSMITTER

CODE Local Indicator

0

1

Without Indicator

With Digital Indicator

CODE Mounting Bracket for 2" Pipe Mounting

0

1

2

Without Bracket

Carbon Steel Bracket

316 SST Bracket

CODE Electrical Connections

0

A

B

1/2-14 NPT

M20 x 1.5

Pg 13.5 DIN

CODE Options

H1

A1

ZZ

316 SST Housing

316 SST Bolts

Special Options - Specify

TT302 1 1 - 0 H1/A1


5-5

TT2EM402.CDR


5-6

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