Omron E5GN - Page 109

Correct process values cannot be obtained if you touch the contact ends of the compensating
conductor during calibration of a thermocouple. Accordingly, shortĆcircuit (enable) or open
(disable) the tip of the thermocouple inside the cold junction compensator as shown in the figĆ
ure below to create a contact or nonĆcontact state for the cold junction compensator.
Connecting the
Cold Junction
Compensator
Cold junction compensator
E5GN
Compensating conductor
Short
0_C/32_F
Open
Cold junction compensator
E5GN
Compensating conductor
0_C/32_F
CHAPTER 6 CALIBRATION
E5GN
6–4
6.3 Calibrating Thermocouples
Ă• Calibrate according to the type of thermocouple, thermocouple 1 group
(input types 0, 2, 5, 6, 8) and thermocouple 2 group (input types 1, 3, 4,
7, 9, 10, 11, 12, 13, 14, 15).
Ă• When calibrating, do not cover the bottom of the E5GN. Also, do not
touch the input terminals (Nos. 8 and 9) or compensating conductor on
the E5GN.
F Preparations
Input power supply
Compensating conductor
Cold junction
compensator
0_C/32_F
89
E5GN
STV
12
-+
Ă• Set the cold junction compensator designed for compensation of interĆ
nal thermocouples to 0_C. However, make sure that internal thermocouĆ
ples are disabled (tips are open).
Ă• In the above figure, STV refers to a standard DC current/voltage source.
Ă• Use the compensating conductor designed for the selected thermocouĆ
ple. However, note that when thermocouples R, S, E, B or a nonĆcontact
temperature sensor is used, the cold junction compensator and the comĆ
pensating conductor can be substituted with the cold junction compenĆ
sator and the compensating conductor for thermocouple K.