Cold Junction Temperature Compensation Setting Function - Mitsubishi Electric NZ2GF2S-60MD4 User Manual

7.5
Cold Junction Temperature Compensation Setting
Function
By selecting the setting with or without cold junction compensation using the built-in temperature sensor in the multiple input
module, two types of cold junction compensation including a temperature sensor and external (ice bath) can be conducted.
Operation
The operations when cold junction compensation is performed using the built-in temperature sensor in the multiple input
module and when cold junction compensation is performed outside the module are described below.
■When cold junction compensation is performed using the built-in temperature sensor in the
multiple input module
By setting Cold junction temperature compensation setting (address: 0118H) to With cold junction compensation (0H), cold
junction compensation using the built-in temperature sensor in the multiple input module is automatically performed.
(1)Compensation lead wire
(2)Thermocouple
(3)Temperature-measured object
■When cold junction compensation is performed outside of the module
Set Cold junction temperature compensation setting (address: 0118H) to Without cold junction compensation (other than 0H)
and install a high-accuracy ice bath outside the module. Because the thermoelectromotive force occurring at the tip of the
thermocouple can be led to the thermocouple input module without making any changes, the accuracy of cold junction
compensation can be improved. This option is selected when highly accurate temperature measurement is required as the
accuracy of cold junction compensation using the built-in temperature sensor in the multiple input module cannot be tolerated
as an error.
(1)Ice bath
(2)Thermocouple +
(3)Thermocouple -
(4)Temperature-measured object
7 FUNCTIONS
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7.5 Cold Junction Temperature Compensation Setting Function

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