The accuracy of local CJC sensor is +/- 0.3 degrees Celsius, and this is the same as remote CJC sensor accuracy. The Allen-Bradley 1756-IRT8I ControlLogix RTD Thermocouple Input Module is equipped with 2 CJC sensors for thermocouple use, but they can be ordered separately. The Allen-Bradley 1756-IRT8I has 8 isolated channels for use in any combination of RTD or Thermocouple modes. This can be either the 1756-TBS6H or the 1756-TBCH. The 1756-IRT8I module is a member of the ControlLogix system, and it requires a 36-pin RTB, or a detachable terminal block housing. Specifically, it is an 8-point isolated combined temperature and millivolts-sensing input module. Manufactured by Allen-Bradley/Rockwell Automation, the 1756-IRT8I is a high-resolution analog I/O module.
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