Thermocouple Input Calibration; Preparations - Omron E5AR-T User Manual

9.3 Thermocouple Input Calibration

• Thermocouples are calibrated in two groups according to thermocouple type: Group 1 (input types 2, 4,
7, 8, 10, 14) and Group 2 (input types 3, 5, 6, 9, 11, 12, 13).
• Do not obstruct the bottom of the Controller during calibration. Also, do not touch the input terminals or
compensating leads.

■ Preparations

Connecting the cold
junction compensator
A
E5AR-T/ER-T
1
Input power supply
2
• Use a cold junction compensator for calibration of internal thermo-
couples and set it to 0°C. The internal thermocouple should be
disabled (end open).
• "STV" in the diagram is a DC reference current/voltage generator.
• Prepare compensating leads appropriate for the selected thermo-
couple. A cold junction compensator and compensating leads for a
K thermocouple can be used for thermocouples R, S, E, B and W.
A correct input value cannot be obtained if the compensation wire connector is
touched during thermocouple calibration. Therefore, to connect or disconnect
the cold junction compensator, short-circuit (enable) or open-circuit (disable)
the tip of the thermocouple inside the cold junction compensator, while keeping
the compensation wire connected as shown in the diagram.
Cold junction compensator
0 C/32 F
E5AR/ER-T
Compensating wire

9.3 Thermocouple Input Calibration

STV
Cold junction
_
5
compensator
+ 6
0 C/32 F
Compensating leads
Cold junction compensator
Short circuit
0 C/32 F
E5AR/ER-T
Compensating wire
Open
9-5