Preparations - Omron E5CN User Manual

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

Preparations

9
Input power supply
10
10
Input power supply
11
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, or B or an infrared temperature sensor
is used, the cold junction compensator and the compensating conductor
can be substituted with the cold junction compensator and the compen-
sating conductor for thermocouple 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
E5CN
0 C/32 F
E5CN-U
E5AN
E5EN
Compensating conductor
E5CN
4
+
5
Compensating conductor
E5CN-U
2
+ 1
Compensating conductor
E5AN/EN
17
+ 18
Compensating conductor
Short-circuit
E5CN
E5CN-U
E5AN
E5EN
Compensating conductor
Section 6-3
STV
Cold junction
compensator
0 C/32 F
STV
Cold junction
compensator
0 C/32 F
STV
Cold junction
compensator
0 C/32 F
Cold junction compensator
0 C/32 F Open
187