Preparations - Omron E5CN-HT User Manual

Thermocouple Calibration (Thermocouple/Resistance Thermometer Input)
6-3-1

Preparations

300
9
Input power supply
10
1
Input power supply
2
• Set the cold junction compensator designed for compensation of internal
thermocouples to 0 C. Make sure that internal thermocouples are dis-
abled (i.e., that tips are open).
• In the above figure, STV indicates a standard DC current/voltage source.
• Use the compensating conductor designed for the selected thermocou-
ple. When thermocouples R, S, E, B, W, or PLII is used, the cold junction
compensator and the compensating conductor can be substituted with
the cold junction compensator and the compensating conductor for ther-
mocouple K.
■ Connecting the Cold Junction Compensator
Correct process values cannot be obtained if you touch the contact ends of
the compensating conductor during calibration of a thermocouple. Accord-
ingly, short-circuit (enable) or open (disable) the tip of the thermocouple inside
the cold junction compensator as shown in the figure below to create a con-
tact or non-contact state for the cold junction compensator.
Cold junction compensator
0 C/32 F
E5@N-HT
Compensating conductor
E5CN-HT
4
+
5
Compensating conductor
E5AN/EN-HT
19
+ 20
Compensating conductor
Short-circuit
E5@N-HT
Section 6-3
STV
Cold junction
compensator
0 C/32 F
STV
Cold junction
compensator
0 C/32 F
Cold junction compensator
0 C/32 F Open
Compensating conductor