eurotherm 818

818

SERIES

Temperature controller

Productdata

FULL

Y CO

MPL

IANT

EUROTHERMONTROLS

The 818 controller is a truly flexible, advanced technology controller which combines

simplicity of operation with powerful control performance. All the high level functions

of the controller may be configured either from the front panel or via the

communications interface whilst the addition of hardware options is achieved by plug-in

modules.

The 818 has a clear vacuum fluorescent display in which the total instrument status is

indicated. Coupled with powerful control software this gives the operator and engineer

alike the ability to optimise process performance.

Since its launch over 100,000 units have been successfully installed worldwide.

Accuracy - The 818 has a low level I/P Analogue to Digital Converter which is

continuously corrected for drift. Operating at a speed of 8 updates per second this gives

very high stability and rapid response to process changes. All linearisations for the

numerous sensors, which are included as standard in the controller, are digitally

calculated to add high accuracy to the other attributes of this unit.

Communications - Two types of communications are available with the 818

controller:

1) Digital communications via an RS232 or RS422/485 interface link using the industrial

standard ANSI-X3.28 protocol bi-synch. This allows all the parameters of the controller

to be monitored or changed by a computer or PLC. Using the RS422/485 standard up to

100 controllers may be networked on a single link. The Baud rate may be set from 300

to 9600.

2) Analogue communications provides retransmission of various selected parameters

such as Process variable and Setpoint.

Also Analogue communication provides the facility to remotely vary selected parameters

such as Setpoint and Maximum power, by means of a dc signal.

Tuning - All versions of the 818 controller offer two separate PID loop tuning

algorithms (Auto Tuning and Adaptive Tuning ) which automate the tedious part of the

commissioning routine. The two algorithms may be used either separately or together

depending upon process needs.

When the tuning algorithms are used together with the Valve Positioner output the 818

makes use of an internal mathematical model of the motor being used in order to tune

correctly even where there is backlash or valve asymmetry.

Self Tune - The self-tuning algorithm is a ‘one-shot’ tuner which may be manually

initiated at any time, in order to retune for a new set of process conditions. When tuning

to a new setpoint, the self-tuner analyses the start up response to give an estimate of

the process with an on-off sequence, which determines the natural response of the

process so that new control parameters can be calculated and the Proportional, Integral

and Deriviative terms set automatically.

Adaptive Tune - The adaptive-tuning algorithm is designed to run continuously, in

the background, while normal PID control is taking place. The algorithm, is activated

when load disturbances cause deviations from setpoint, in excess of a predefined trigger

point. The algorithm then proceeds to analyse the closed loop response, while the

process value recovers from the initial disturbance and applies expert rules to retune the

loop. If this loop is already well tuned, no action is taken.

818 Temperature controller

TECHNICAL SPECIFICATION Quoted at 25°C unless otherwise statedInputsGeneral Input range -8.0mV to +60mV

Min span 5.0mV

Max span 68mV

Max zero offset 20% of span (in mV)

Common mode rejection <50µV display change for 264V rms at 50/60Hz

Series mode rejection <50µV display change for 50mV rms at 50/60Hz

Input impedance >1M ohm resistance (includes 0.6mA open circuit sensor current)

Resolution 12 bit for all ranges (14 bit max)

Sample period 125 milliseconds

Linearity error Better than ±0.1% of input span

Thermocouple Standards British BS4937 (1973) German DIN 43710 US ASTM E230 (1972)

Linearisation Better than +/-0.2°C for standard thermocouple. Effect of thermocouple lead resistance 0.5µV/ohm

CJC Internal or 0°C, 45°C, 50°C external

Internal CJC Error Typically 0.05°C/°C ambient change (20:1)

RTD Standards British BS1904 German DIN 43760 PT100

Linearisation Better than +/-0.2°C for standard resistance thermometers

Bulb Current 0.2mA

Connection 3 wire automatic lead resistance compensation

Lead compensation error With up to 22 ohms in all three leads no change in display indication

Volts Ranges Minimum span 5.00mV. For spans above 60.0mV an extenal attenuator mounted in an extension

block on the rear terminals is used

Input impedance >100k ohms

Current 0-20mA or 0-10mA. With all current ranges, burden resistors are mounted onto the rear terminals

2.5 ohms for 20mA input and 5 ohms for 10mA input. Offsets provided as software option

e.g. 4-20mA

Outputs Relay Maximum of 264V 2A ac into resistive load, with contact suppression. On/off or time proportional

Minimum voltage 30V rms or dc.

Leakage current through contact suppression components = 2mA @264V ac 50Hz

Triac Maximum of 264V 1A ac into resistive load. On/off or time proportional

Minimum voltage 85V rms

Leakage current through snubber = 2mA at 264V ac 50Hz

Isolated logic 20mA at 15V min. On/off or time proportional

Cycle time 0.3 to 100 seconds at 50% power (relay 10 to 100 seconds)

Power feedback Normally fitted to any of the above when using output 1 (heat)

Analogue Isolated dc 0-10V at 20mA max or 0-20mA at 12 volts. Offsets provided as software option

i.e. 4-20mA. Output impedance on voltage ranges is <1.1 ohms (including connectors)

Retransmission Channel 2 (cool output) or channel 3 (alarm output) can be designated retransmission output of

setpoint, measured variable, error or output power

Retransmission output 10 volts span (max) range lying between 0 to +10 volts at 20mA max. 0-20mA (max) at 12 volts

(min). Offsets provided as software options i.e. 4-20mA

Output impedance on voltage ranges is <0.1 ohms (including connectors)

Retransmission resolution 12 bit effective

Retransmission linearity accuracy Better than 0.5% under all load conditions which are within specifications

Isolation Both output 1 and 2 are isolated from each other and the remainder of the instrument

Outputs (cont’d)Reverse/direct Time proportioning and analogue in output 1 (heat) can be configured either reverse or direct

Output 2 (cool), if time proportioning or analogue, is configured as acting the opposite to output 1

Non-linear Output 2 (cool), when not on/off, can be configured as either linear or non-linear characteristic. The

non linear characteristic is ideal for controlling water which may flash off to steam

Alarms Relays Maximum 264V 2A ac into resistive load, with contact suppression. Minimum switched

voltage 30 volts rms or dc

Leakage current through contact suppression components = 2mA @ 264V ac 50Hz

Hysteresis 0.1 - 10.0% variable, in 0.1% resolution

Type Full scale high and low; deviation high and low; deviation band

Range Alarms may be set over complete instrument range

ParametersControl Auto/Manual Bumpless transfer auto to manual and manual to auto. Manual output variable from

0 to 100% for heat outputs and -100% to +100% for heat/cool instruments

Local/remote Selection of full scale local or remote S/P or add external trim to F.S local or F.S external to local trim

setpoint

Dual P.I.D. Separate values of Pb, ti, td, Cr and RES are installed when Setpoint 2 (SP2) is selected

Commissioning * Proportional Band (PB) 0.1 to 999.9% based on the range ‘display max’ - ‘display min’ or 1 to span in Engineering Units

Integral Time (ti) Off, 1 to 9999 seconds or 1 to 150 minutes

**Travel Tme (tt) 10-1000 secs

Deadband (db) 0.1 - Pb (in %)

1 -Pb (in units)

Pot Min Limit (PI) 0-100%

Pot Max Limit (Ph) 0-100%

Manual reset (RES) -100 or 100% (automatically selected if integral time is ‘off’)

Derivative time(td) Off, 0.1 to 999.9 secs or 1-15 mins

Cut back (CBL/CBH) Off, 0.1 to display range for both low and high

Heat output limit (HL) 0 to 100%

Cool output limit (CL) 0 to -100%

Heat cycle time (HC) 0.3 to 100 seconds (10 to 100 secs for relay)

Cool cycle time (Cc) 0.3 to 100 seconds (10 to 100 secs for relay)

* Relay cool gain (Cr) 0.1 to 20.0 of proportional band (PB)

Heat-cool deadband (DB) -5 to +5% input range

Setpoint rate limit (Pr) 1 to 19999 units per min or hour with decimal position as display eg. XX.XXX display 0.001 to 19.999

Emissivity (PE) 0.01 to 1.00

Sensor break power (SbP) 0 to 100% (heat only) or - 100% to 100% (heat/cool) activated by 10% over or under range

* For on/off outputs proportional band and/or relative cool gain are replaced by deadband and relative

deadband

** Parameter for VP output only

CommunicationAnalogue input Voltage Max 10 volt range lying between -5.0 to 10.0 volts

Input impedance >75K ohms

Current 0-10mA, 0-20mA, offsets provided as software options e.g. 4-20mA

Input impedance 500 ohms mounted on rear terminals

Potentiometer supply 10 volt, 1mA max. potentiometer supply available

Configuration Isolated remote setpoint, remote trim, output power limit

Resolution 12 bit effective

Accuracy Better than 0.5%

Sample period 750 milliseconds

Analogue output Voltage Max. 10 volts, range lying between -5 volts to +10 volts internal impedance <0.1 ohms (including

connectors)

Impedance Load must be >500 ohms

Current 0-20mA (max) at 12 volts min offsets provided as software options e.g. 4-20mA

Configuration Setpoint, measured value, error, or output power (excludes use of channel 2 or 3 as retransmission)

Resolution 12 bit

Linearity accuracy Better than 0.5% under all load conditions which are within specification

Digital Protocol Variable speed link. ASCII format RS232 or RS422/485 protocol ANSI X 3.28 (1976)

2.5 A4 variable baud rates of 300, 600, 1200, 2400, 3600, 4800 and 9600 alternatively Modbus® RTD

or J-Bus® RTD at variable baud rates of 600, 1200, 2400, 3600, 4800 and 9600

Isolation Between communication link and all other inputs and outputs meets IEC348, UL1092 and VDE 411 and

BS4743 standard

Format Start bit - seven data bits - even parity bit - one stop bit (ANSI protocol)

Start bit - eight data bits - one stop bit (ModBus® or J-Bus® protocol)

Unit Address Two digits (00 - 99)

Logic inputs Drive Pulled up to +5 volts in reset state: must be pulled down to 0 volts with an impedance of <100 ohms to

activate

Isolation Logic inputs not isolated from one another or measured value input but isolated from all other inputs and

outputs. As defined under General Electrical Safety.

Voltage Level Limits For logic input active the input level must be less than 0.70 volts for logic in-active the input level must be

greater than 4.00 volts

Input Current 0.5mA maximum

Configuration Auto/manual: Remote/local; Dual P.I.D. Adaptive/self tune; keylock; Ramp enable

(one only per logic input) Remote up/down key; Parameter modification security

Auto Tune Self-tune (ST) A single shot approach which freezes three term parameter after defined period

Adaptive tune (AT) A continuous appraisal and re-defining of three term parameters

General The 818S is compliant with the ‘Low Voltage Equipment Directive’ and the ‘EMC Directive’ when installation instructions are followedDisplay Upper Display 5 x 7 segment 12mm high fluorescent indicator. Display range +19999 to -9999

Lower Display 5 x 7 segment 5mm high fluorescent indicator

Resolution ± 1 least significant digit

Calibration Error Better than ±0.25% span

Environmental Supply Voltage 85 to 264V ac, 17 to 40V ac or 20 to 40V dc

Supply Frequency 48 to 62Hz

Power Consumption 8.5 watts

Operating Temperature 0 - 55°C

Supply Fuse 500mA (anti surge)

EMC Emissions: EN 50081-2 (94)Immunity: Follows the general requirements of EN 50082-2 (95)

Radiated fields may cause PV or remote input to deviate by 1% of spanSee Technical Construction File for details

Creepage Clearences conform to IEC 348, UL 1092 and VDE 411 and BS4743 standards

Relative humidity 0 to 90% non-condensing

Storage temperature -10 to 70°C

Panel Sealing The instrument fascia meets IP54 when mounted into a cutout as defined below and fitted

with the optional gasket

Electrical safety EN 61010 (93), Installation category II, polution degree 2Installation category II Voltage transients on any mains power connected to the instrument must not exceed 2.5kVPollution degree 2 Conductive pollution must be excluded from the cabinet in which the instrument is mounted

Ambient temperature coefficient Typically ±50 ppm/°C of instrument input span. Excluding CJC on the thermocouple instruments

Warm up drift <±0.5% of display range (from 1 to 30 mins)

Supply voltage coefficient <±0.1% of display range over full supply voltage range

Mechanical Customer Connections Screw terminals with terminal cover (fastons optional)

Dimensions 96mm(H) x 96mm(W) x 219mm(D)( including terminal cover)

Mounting Plug in with panel mounting sleeve - Panel cutout 92 x 92mm + 0.8 - 0.0mm to DIN 43710

Weight 1.2Kg (2.6lbs) including sleeve and clamp

Vibration BS2011 EA, EB, FC

ORDERING CODE

Input Code

Thermocouple TC

Resistance thermometer RTD

0-20mA 0mA20

4-20mA 4mA20

0-5V 0V5

1-5V 1V5

2-10V 2V10

-8mV +8mV 8mV8

Pyrometer PYR

Output 1 & 2 Code

Output 1 Output 2

Prefix Prefix

Reverse acting control R

Direct acting control D

Control on output 2

(opposite action to output 1) C

Retransmission of:

Process variable M

Setpoint S

Error E

Power W

Note 1: For normal temperature control select

Reverse Acting Control

Output 2 action opposite of output 1.

Note 2: The Retransmission option is not available

with Analogue Comms, or when retransmission

specified in alarm 1

Output 1 Output 2

Relay linear RLY RLY

Relay non linear - RLYN

Relay ON/OFF *RLYF RLYF

Logic linear LGC LGC

Logic non linear _ LGCN

Logic ON/OFF *LGCF LGCF

Triac Linear TRI TRI

Triac non linear _ TRIN

Triac ON/OFF *TRIF TRIF

No output NONE NONE

Isolated 0-5V 0V5 0V5




Isolated 0-10mA 0mA10 0mA10



Communications

Digital

Type Code Function Code

None NONE None NONE

Digital RS232 232 Baud rate 9600 96

Digital RS485 485 Baud rate 4800 48

J-Bus®RS232 J32 Baud rate 3600 36

J-Bus®RS485 J85 Baud rate 2400 24

M-Bus®RS232 M32 Baud rate 1200 12

M-Bus®RS485 M85 Baud rate 600 06

Baud rate 300 03

Analogue

Input type Retrans function

Prefix 1st digit Prefix 1st digit

Remote setpoint X Process variable M

Remote trim T Setpoint S

Remote S/P with:

Local trim L Error E

O/P max power W Power W

Code Code

2nd digit 2nd digit

Input type onwards Retrans func. onwards

None NONE None NONE

0-20mA 0mA20 0-20mA 0mA20

4-20mA 4mA20 4-20mA 4mA20

0-5V 0V5 0-5V 0V5

0-10V 0V10 0-10V 0V10

1-5V 1V5

2-10V 2V10

-5 to +5V 5V5

Option Code

Faston terminal FN

Screw terminal SN

Faston 24V ac/dc FN24

Screw 24V ac/dc SN24

Motor Valve Controller

Output 1 Output 2

Relay output VPR

Triac output VPT

with feedback pot FB

without feedback pot NONE

Note: With MVC no output 2 prefix is required.

With output 2 prefix M, S, E, W only dc ouputs

apply

* ON/OFF on O/P1 restricts O/P2 to ON/OFF

unless prefix M, S, E, W

Alarms 1 & 2 1st & 2nd digit Code

None NONE

Deviation band DB

Deviation high DH

Deviation low DL

Full scale high FH

Full scale low FL

Relay State in Alarm 3rd digit Code

Energised E

De-energised D

Note: On valve positioner version using a

Feedback pot. (FB in output 2) Alarm 2 must be

‘NONE’

Type Code

0-20mA 0mA20

4-20mA 4mA20

0-5V 0V5

1-5V 1V5

2-10V 2V10

Alarm 1 Retransmission Prefix to code

Process variable M

Setpoint S

Error E

Power W

Alarm 2 Remote input Prefix to code

Remote setpoint X

Remote trim T

Remote S/P with local trim L

Maximum output power W

Alarm channels can be used for analogue inputs/

outputs if not required for alarms

Note: Only one retransmission output and one

remote input is allowed within the controller

818S

Basic Comms Comms Display Display Dig Dig SoftwareProduct Input Output 1 Output 2 Alarm 1 Alarm 2 Type Funct. Option Curve Min Max Units Input 1 Input 2 Options

Display Min/Display Max

These should be selected from the recommended

minimum and maximum ranges shown in Curve.

Include decimal point position - This is especially

important on linear range

Input Coding

Curve - Select from the range shown

Linear type Min and max. ranges Recommended ranges Code

Iron constantan J -210C to 1200C 0C to 600C 01

Fe/Konst (DIN) L -200C to 900C 0C to 600C 02

Ni Cr/Ni Al K -270C to 1372C -250C to 1200C 03

Ci/Con T -270C to 400C -250C to 400C 04

Pt13%Rh/Pt R -50C to 1767C 0C to 1600C 05

Pt10%Rh/Pt S -50C to 1767C 0C to 1600C 06

Pt30%Rh/Pt6%Rh B 40C to 1820C 400C to 1820C 08

W/w26%Re -70C to 2000C 0C to 2000C 09

W5%Re/W26% 10C to 2320C 10C to 2300C 11

Ni Cr/Con E -270C to 1200C 0C to 780C 12

Pt10%Rh/Pt40%Rh 200C to 1800C 200C to 1800C 23

W5%Re/W26%Re C 0C to 2500C 0C to 2300C 24

Pt20%Rh/Pt40%Rh 0C to 2000C 0C to 1600C 25

Platinel 11 -100C to 1370C 0C to 1200C 28

W/W26%Re 0C to 2010C 0C to 2010C 29

Ni/Ni18%Molybednum 0C to 1100C 0C to 1100C 33

W3%Re/W25%Re D -30C to 2410C 0C to 2400C 35

W/Res5%W/Re26% 0C to 2000C 0C to 2000C 38

Nicrosil/Nisil N -270C to 1300C 0C to 1300C 45

Pt100 ohm at 0°C -200C to 850C -200C to 800C 70

Pyrometer (Q004 Land) 700C to 1550C 800C to 1550C 48

Pyrometer (Q003 Land) 600C to 1500C 700C to 1400C 51

Pyrometer RO 26 0C to 500C 100C to 500C 54

Pyrometer IVDI 1000C to 2500C 1000C to 2500C 61

Pyrometer DTI 750C to 2500C 1200C to 2500C 62

Pyrometer RO 23 700C to 1700C 800C to 1700C 64

Pyrometer FP/GP 10 450C to 900C 500C to 900C 82





Linear -9999 to 19999 -9999 to 19999 00*

Square root -9999 to 19999 -9999 to 19999 92*

Units

NONE

°C

°F

K

MV

V

MA

%

(or specify up to 5 characters)

* For linear inputs sensitivity must not be less than

5µVs/digit

Digital Inputs

Dig I/P 1 Dig I/P 2

None NO NO

Auto manual AM AM

Local remote LR LR

Adaptive tune AT -

Keylock KL -

DIG I/P 1 up key* UK -

DIG I/P 2 down key* - DK

Parameter security PS -

Self tune - ST

SP 2/SP 1** S2 S2

PID 2/PID1 - P2

Ramp - RP

* These options must be selected together. If

selected no other input is possible

** Not available with remote trim

Software Options

Function Code

Manul key enabled E

Manual key disabled D

Cold junction Code

Non T/C input N

Internal compensation IN

External 0°C ref 0

External 45°C ref 45

External 50°C ref 50

Function Code

Integral and deriavative in secs S

Integral and derivative in mins M

Integral and derivative in secs with

dual PID SS

Integral and derivative in mins with

dual PID MM

Function Code

Power feedback P*

No power feedback N

* Not available on dc or VP outputs therefore

enter N

Part No. HA021479 Iss 7 Printed in England 0697

© Copyright Eurotherm Controls Limited 1990All rights strictly reserved. No part of this document may be stored in a retrieval system, or any form or by any means without prior written permission from Eurotherm Controls Limited. Every effort hasbeen taken to ensure the accuracy of this specification. However in order to maintain our technological lead we are continuously improving our products which could, without notice, result inamendments or omissions to this specification. We cannot accept responsibility for damage, injury loss or expenses resulting therefrom.

DIMENSIONAL DETAILS

9 mm max. thickness

Panel cut-out 92 x 92 +0.8 -0 mm

96 mm

96 m

m

12 mm * 201 mm Excluding Terminal Cover

* 219 mm Including Terminal Cover

Dimensions apply to both screw and faston versions of sleeve without the gasket fitted

* These dimensions will decrease by 1.5 mm when the gasket is fitted

EUROTHERM CONTROLS LIMITEDUK SALES OFFICEEurotherm Controls LimitedFaraday Close, DurringtonWorthingWest Sussex BN13 3PLTelephone Sales: (01903) 695888

Technical: (01903) 695777Service: (01903) 695444

Fax (01903) 695666

Sales and support in over 30 countries worldwideFor countries not listed enquiries/orders to:Eurotherm Controls LimitedExport Dept., Faraday Close, Durrington, Worthing West Sussex, BN13 3PL Telephone (01903) 268500Fax (01903) 265982Telex 87114 EUROWG G

eurotherm 818

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