Chapter 12 Thermocouple Input Option Module (XBO-TC02A)
12.4 Characteristic of Thermocouple Temperature Conversion
Thermocouple input module connect 2 kinds of thermocouple directly, input characteristic are as
described below.
(1) Thermocouple K (JIS C1602-1995): -200
(-5891
) ~ 1300
(52410
)
(2) Thermocouple J (JIS C1602-1995): -200
(-7890
) ~ 1200
(69553
)
Thermocouple characteristics: thermocouple sensor measures temperature by using fine voltage
(electromotive force), which occurs when applying temperature gradient to a junction between two
different metals.
The temperature-electromotive force relation specification of normal thermocouple sensor provides
the electromotive force, which is measured when a sensor’s measuring point is at O℃. On that
account, when measuring temperature by using thermocouple sensor, cold junction compensation
(reference junction compensation, RJC) is used. (built-in function of temperature measuring module).
Remark
12 - 5
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