2208
MODEL
• Heating and cooling
with two modular
outputs
• Customised operation
• Heater current display
• Load diagnostics
• Up to three alarm
relays
• Self-tuning with
overshoot inhibition
2208
OP1
OP2
SP2
REM
Temperature Controller
The 2208 is a precision PID
temperature controller, with selftuning, in an 1/8 DIN size
(48x96x103mm). It has a modular
hardware build with the option of
two control outputs, two alarm
relays, and a communications
port. Two digital inputs are
included as standard. The control
outputs can be configured for
heating, cooling or alarms. The
2208 is fully configurable on-site.
Precise control
An advanced PID control
algorithm gives stable ‘Straightline’ control of the process.
A one-shot tuner is provided to
• Setpoint rate limit
set up the PID values and to
• EIA 485 communications calculate the overshoot inhibition
parameters. On electrically
• Plug-in from front
heated loads, power feedback is
used to stabilise the output
• IP65, NEMA 4X panel
power and hence the controlled
sealing
temperature against supply
voltage fluctuations. Dedicated
• Compliant with
cooling algorithms ensure
European EMC
optimum control on fan, water
and low voltage
and oil cooled systems.
• Optimised fan, water
and oil cooling
safety directives
EUROTHERM
ON TROL S
Universal input
A universal input circuit with an
advanced analogue to digital
convertor samples the input at
9Hz and continuously corrects it
for drift. This gives high stability
and rapid response to process
changes. High noise immunity is
achieved by rejection of 50/60Hz
pick-up and other sources of
noise. The input covers all
standard thermocouples, the
Pt100 resistance thermometer
and linear millivolts, milliamps or
DC volts.
Input filtering from 1.0 to 999.9
seconds is included.
Customised operation
Custom LEDs provide a bright,
clear display of the process value
and setpoint. Tactile push
buttons ensure positive
operation. Access to other
parameters is simple and easy to
understand and can be
customised to present only those
parameters that need to be
viewed or adjusted. All other
parameters are locked away
under password protection.
Temperature
Controller
PDSIO Load diagnostics
Alarms
Digital communications
PDSIO (Pulse Density Signalling I/O) is a
major innovation in the 2208. When used
in combination with a Eurotherm TE10
solid state relay (SSR), it allows the logic
output of a 2208 to transmit the power
demand signal and simultaneously read
back load fault alarms. These alarms will
be flashed as messages on the controller
front panel. Two alarm conditions will be
detected, either SSR failure indicating an
open or short circuit condition in the SSR
and heater circuit failure indicating either
fuse failure, heater open circuit or line
supply absent.
Up to four process alarms can be
combined onto a single output. They can
be full scale high or low, deviation from
setpoint or load failure alarms. Alarms
messages are flashed on the main display.
Alarms can be configured as latching or
non-latching and also as ‘blocking’ type
alarms which means that they will
become active only after they have first
entered a safe state.
EIA 485 serial communications is
available with industry-standard
protocols including: Modbus®,
Eurotherm Bisynch, and SPI.
Load diagnostic using Pulse Density Signalling Input/Output (PDSIO)
Supply
2408
OP1
OP2
PDSIO 2-wire
Connection
SP2
TE10 solid
state relay
REM
Heater
Sensor inputs and display ranges (Temperature scales conform to the ITS90 standard)
Celsius
Standard Sensor Inputs
J thermocouple
K thermocouple
T thermocouple
L thermocouple
N thermocouple
C thermocouple - W5%Re/W26%Re (Hoskins)
R thermocouple
S thermocouple
B thermocouple
Platinel II thermocouple
RTD/PT100DIN 43760
Custom Sensor Inputs (replaces type C thermocouple)
E thermocouple
Ni/Ni18%Mo thermocouple
Pt10%Rh/P140%Rh thermocouple
Pt20%Rh/Pt40%Rh thermocouple
W/W26%Re (Englehard) thermocouple
W/W26%Re (Hoskins) thermocouple
W5%Re/W26%Re (Englehard) thermocouple
W5%Re/W26%Re (Bucose) thermocouple
D thermocouple - W3%Re/W25%Re
Linear Inputs
Fahrenheit
Min
-210
-200
-200
-200
-200
0
-50
-50
0
0
-200
Max
1200
1372
400
900
1300
2319
1768
1768
1820
1369
850
Min
-350
-325
-325
-325
-325
32
-60
-60
32
32
-325
Max
2192
2500
750
1650
2370
4200
3200
3200
3310
2500
1560
-200
0
200
0
0
0
10
0
0
-999
1000
1100
1800
2000
2000
2010
2300
2000
2400
9999
-325
32
392
32
32
32
50
32
32
1830
2012
3272
3632
3632
3650
4172
3632
4352
2208 CONTROLLER TECHNICAL SPECIFICATION
Inputs
General
Thermocouple
RTD/PT100
Process
Digital
Range
Sample rate
Calibration accuracy
Resolution
Linearisaton accuracy
Input filter
Zero offset
Types
Cold junction compensation
Type
Bulb current
Lead compensation
Linear
Type
Application
± 100mV and 0 to 10Vdc (auto ranging)
9Hz (110mS)
0.25% of reading or ±1°C or ± 1 LSD whichever is the greater
<1µV for ± 100mV range, <0.2mV for 10Vdc range
<0.1% of reading
1.0 to 999.9secs
User adjustable over the fully display range
See sensor inputs table
Automatic compensation typically >30 to 1 rejection of ambient temperature change
External references 0, 45 and 50°C
3-wire, Pt100 DIN43760.
0.2mA
No error for 22 ohms in all 3 leads
±100mV, 0 to 20mA or 0 to 10Vdc (configurable between limits)
Contact closure
Manual select, 2nd setpoint
Outputs
Relay
Logic
Triac
Analogue
Rating: 2-pin relay
Rating: change-over, alarm relays
Application
Rating
Application
Rating
Application
Range
Application
Min: 12V, 100mA dc. Max: 2A, 264Vac resistive
Min: 6V, 1mA dc. Max: 2A, 264Vac resistive
Heating, cooling or alarms
18Vdc at 24mA (non-isolated)
Heating, cooling or alarms
PDSIO mode 1: Logic heating with load failure alarm
PDSIO mode 2: Logic heating with load/SSR failure alarm and load current display
1A, 30 to 264Vac resistive
Heating or cooling
Non-isolated, 0 to 20mA (configurable between limits). 600Ω max load resistance
Heating or cooling
Transmission standard
Protocols
Setpoint input
EIA 485 at 1200, 2400, 4800, 9600 and 19,200 baud
Modbus® or Eurotherm Bisynch or SPI
Setpoint input from master PDSIO controller. Holdback to master controller
Modes
Application
Auto/manual
Setpoint rate limit
Cooling algorithms
One-shot tune
Automatic droop compensation
Types
Modes
PID or PI with overshoot inhibition, PD, P only or On/Off
Heating and cooling
Bumpless transfer
0.01 to 99.99 degrees or display units per second
Linear; Water (non-linear); Fan (minimum on time), Oil
Automatic calculation of PID and overshoot inhibition parameters
Automatic calculation of manual reset value when using PD control
Full scale high or low. Deviation high, low, or band. Rate of change
Latching or non-latching. Normal or blocking action
Up to four process alarms can be combined onto a single output
Display
Dimensions and weight
Supply
Temperature and RH
Panel sealing
Electromagnetic
compatibility
Safety standards
Atmospheres
Dual, 4 digit x 7 segment high intensity LED
48mm wide x 96mm high x 103mm deep. 400g
85 to 264Vac -15%, +10%. 48 to 62Hz. 10watts max
Operating: 0 to 55°C, RH: 5 to 90% non-condensing. Storage: -10 to 70°C
IP65
Meets generic emissions standard EN50081-2 for industrial environments
Meets general immunity requirements of EN50082-2 for industrial environments
EN61010, installation category 2. (voltage transients must not exceed 2.5kV)
Electrically conductive pollution must be excluded from the cabinet in which this controller is
mounted. This product is not suitable for use above 2000m or in corrosive or explosive
atmospheres without further protection.
Communications
Digital
PDSIO
Control functions
Control
Tuning
Alarms
General
2208 Rear Terminal Connections and Outline Dimensions (mm)
103
48
2408
OP1 OP2
Panel cut-out
-0.0
-0.0
92+0.8 x 45+0.6
96
REM
SP2
AUTO
MAN
+
+
DC or Logic or
-
O
U
T
U
P
U
T
1A
or
Output 1
-
1B
1C
+
Logic or
or
1D
1
2A
2C
O
U
T
P
U
T
2D
2
Output 2
-
2B
Alarm 2
relay
Line
85-264Vac
Neutral
L
N
Earth
C
O
M
M
S
HD
LA
HE
LB
HF
LC
Input 1
Input 2
AA
Alarm 1
relay
AB
3A
AC
3B
VI
3C
V+
3D
V-
Thermocouple
+
RTD/ PV
PT100 -
Ordering Code
Basic Product
2208
CC
Function
Controller
XX
L1
R1
T1
D1
Output 1
None
Logic
Relay
Triac
DC: isolated
R1
Output 2
None
Logic
Relay
T1
Triac
XX
L1
XX
RF
Alarm 1
None
Relay
XX
RF
Alarm 2
None
Relay
Manual
Comms
XXX No Manual
None
RS PDSIO SP input ENG English
French
YM 485 Modbus FRA
GER German
ITA
Italian
XX
The above ordering code specifies only the hardware build. The input type and output control functions must
then be configured on-site to suit a particular application. If you require pre-configuration by us ask for details of
the full ordering code.
ONE
RAN
GE
ALL S
O
LUTIO
NS
EUROTHERM CONTROLS LIMITED
UK SALES OFFICE
Eurotherm Controls Limited
Faraday Close, Durrington
Worthing
West Sussex BN13 3PL
Telephone Sales: (01903) 695888
Technical: (01903) 695777
Service: (01903) 695444
Fax (01903) 695666
Sales and support in over
30 countries worldwide
For countries not listed
enquiries/orders to:
Eurotherm Controls Limited
Export Dept.,
Faraday Close, Durrington, Worthing
West Sussex, BN13 3PL
Telephone (01903) 268500
Fax (01903) 265982
Telex 87114 EUROWG G
ED-07
© Copyright Eurotherm Controls Limited 1995
All 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 has been 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 in amendments or omissions to this specification. We cannot
accept responsibility for damage, injury, loss or expenses resulting therefrom.
Part No. HA025552 Issue 2