Thermocouple Calibration - Omron E5AC-T User Manual

7 User Calibration
7-3

Thermocouple Calibration

• Calibrate according to the type of thermocouple: thermocouple group 1 (input types 5, 7, 11, 12, 15,
19, and 20) and thermocouple group 2 (input types 6, 8, 9, 10, 13, 14, 16, 17, 18, 21, 22, 23, and 24).
• When calibrating, do not cover the bottom of the Controller. Also, do not come into contact with the
input terminals (E5CC-T: terminals 5 and 6, E5EC-T/AC-T: terminals 23 and 24).
Preparations
Input power supply
• Set the cold junction compensator designed for compensation of internal thermocouples to 0°C.
Make sure that internal thermocouples are disabled (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 thermocouple. When thermocouples R,
S, E, B, W, or PLII 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
compensating conductor for thermocouple K.
Additional Information
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. Accordingly, 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 contact or non-contact state for the cold junction compensator.
E5@C-T
Compensating conductor
7 - 4
E5CC-T
11
−
5
Cold junction
12
compensator
+
6
Compensating conductors
Cold junction compensator
Short-circuit
0°C/32°F
STV
1
Input power supply
2
0°C/32°F
Cold junction compensator
0°C/32°F
E5@C-T
Compensating conductor
E5@C-T Digital Temperature Controllers User's Manual (H185)
STV
E5EC-T/AC-T
−
23
Cold junction
compensator
+
24
0°C/32°F
Compensating conductors
Open