Operating Instruction
10 Commissioning
10.1 Connections
Hazardous area
English
Safe area
Input circuitry:
Thermocouple
External cold junction compensation
Resistance thermometer /
Potentiometer
2-wire 3-wire 4-wire
Single
Channel
Dual
Channel
*) the connection of two sensors in 4-wire scheme requires an additional external clamp.
Line fault detection:
The devices offer a line fault detection mode for the sensor circuit, which can be activated or deactivated. The limits for the detection acc. to sensor type:
Resistance thermometers (RTD)
Short circuit Resistance falls below the linearization characteristics (for measurement mode „temperature“)
Open circuit for sensors < 1 k Ω
Open circuit for sensors > 1 k Ω
Thermocouple
Resistance exceeds approx. 1,3 k
Resistance exceeds approx. 11 k
Ω
Ω
24
English Operating Instruction
Open circuit Resistance exceeds approx. 1,3 k Ω
Resistance transmitter / Potentiometer
Short circuit Resistance falls below measurement range
Open circuit for sensors < 1 k
Open circuit
Ω for sensors > 1 k Ω
Output circuitry:
Resistance exceeds approx. 1,3 k Ω
Resistance exceeds approx. 11 k Ω
9182/ /.0-51-6* /10-51-6* channel
# 2 channel
# 1
A
B
A, B: Relay A, Relay B configuration see chapter 7.6
Ex i signal duplication of input circuitry:
The two multiplexed Ex I inputs of a dual channel ISpac 9182 may be connected in parallel to one sensor in order to achieve a duplication of the 4…20 mA output signal. The parallel connection is permitted – from the functional as well as intrinsic safety perspective. The function can be applied for regular automation applications as well as for safety applications.
Thermocouple
External cold junction compensation
Resistance thermometer / potentiometer
2-wire 3-wire 4-wire
Channel 2
14
13
Channel 1 12
10
25
