Cold_junction_compensation_for_type_K_thermocouple

Published:2009/7/19 22:16:00 Author:Jessie | From:SeekIC

This circuit shows an AD590 that is connected to compensate a type-K thermocouple. The reference junctions should be in close thermal contact with the AD590 case. V+ must be at least 4 V and ICL8069 current should be set at 1 to 2 mA. Calibration does not require shorting or removal of the thermocouple. Set R1 for V2= 10.98 mV. If very precise measurements are needed, adjust R2 to the exact Seebeck coefficient for the thermocouple used (measured or from table), then note V1 and set R1 to buck out this voltage (that is, set V2 to equal V1). For other thermocouple types, adjust values to the appropriate Seebeck coefficient.



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