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The TCR6 was an external thermocouple reference junction for the 21X  or CR7 dataloggers. Up to six thermocouples could be connected to the TCR6. The reference temperature was measured by a Class A platinum resistance thermometer (PRT) conforming to the DIN 43760, 1980 standard. A benefit of using an external thermocouple reference junction was to reduce the cost of thermocouple wire for long lead lengths.

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