XTR112 114 thermocouple measuring circuit diagram of a loop

As shown, the OPA277 constitute inverting amplifier, inverting amplifier use high input impedance characteristics can be reduced and the loop thermocouple offset drift. 50 pote

ntiometer for calibration, adjustable-inverting input of the amplifier bias so that J-type thermocouple in the operating temperature range corresponding to the output current 4 ~ 20mA.

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