Omron E5GN User Manual page 109

CHAPTER 6 CALIBRATION
6.3 Calibrating Thermocouples
F Preparations
Connecting the
Cold Junction
Compensator
6–4
• 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).
• 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.
1 2
Input power supply
Compensating conductor
Cold junction
compensator
0_C/32_F
• Set the cold junction compensator designed for compensation of inter
nal thermocouples to 0_C. However, make sure that internal thermocou
ples are disabled (tips are open).
• In the above figure, STV refers to a standard DC current/voltage source.
• Use the compensating conductor designed for the selected thermocou
ple. However, note that when thermocouples R, S, E, B or a non contact
temperature sensor is used, the cold junction compensator and the com
pensating conductor can be substituted with the cold junction compen
sator and the compensating conductor for thermocouple K.
Correct process values cannot be obtained if you touch the contact ends of the compensating
conductor during calibration of a thermocouple. Accordingly, short circuit (enable) or open
(disable) the tip of the thermocouple inside the cold junction compensator as shown in the fig
ure below to create a contact or non contact state for the cold junction compensator.
Cold junction compensator
E5GN 0_C/32_F
Compensating conductor
E5GN
8 9
- +
STV
Cold junction compensator
Short
E5GN
0_C/32_F
Compensating conductor
Open