Calibration Of Reference Junction Compensation - Toho Electronics TRM-10C Instruction Manual

(3) Calibration of Reference Junction Compensation

Conduct this calibration in case of thermocouple input.
Wiring
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Digital Voltmeter
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Precision
Voltage(Current)
Generator
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Copper Wires
Calibration
Example) Connect the input to Channel 1 and setting the calibration when the thermocouple
input value (RMC measurement) is -0.5 (input 0℃), the measured RJC temperature
is 24.5℃.
1) Check the Process variable when impressing 0.000mV±2μV to Channel 1 by the voltage
generator beforehand. (In this example, it is -0.5℃.)
2) Check the terminal temperature of Channel 1 at the data calibration in the engineering
mode (Reference junction compensation). (In this example, it is 24.5℃.)
3) Setup the value which added a part for the difference with true value (0.5℃) as the right
RJC temperature.
[24.5-(-0.5)=25.0℃]
Conduct calibration according to the instructions in 7.2.12 Data Calibration (Calibration of reference
junction compensation). (See Page 94)
［Note］
① This calibration is conducted when compensation by the recorder's built-in temperature
sensing element (INT: internal compensation) is selected as the reference junction
compensation method.
② Wire to Channels 1 and 2 to conduct calibration.
③ After wiring, attach the terminal covers and wait for 5 minutes or more. Then, conduct
calibration.
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Freezing Point
Cold Junction
Compensator
(Iced Water)
―111―
Thermocouple Wires or Compensation Lead Wires
Be sure to attach a terminal cover.
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TRM-10C Recorder
Input Terminals
HXPRM10mnCT002E