That is a design circuit for a stand alone temperature transducer/sensor circuit. This device uses The AD596/AD597, employing its internal junction compensation temperature sensor inside. Here’s the figure of the circuit;
This device can be used as temperature sensor by omitting the thermocouple and connecting the inputs (Pins 1 and 2) to common. The output will reflect the compensation voltage and the AD596/AD597 temperature will be indicated by the output. the AD596/AD597 will be operated over the full extended –55°C to +125°C temperature range. This device has output scaling of 10.1 mV per°C with the AD597 and 9.6 mV per °C with the AD596. When AD596 is used in temperature sensing mode, it will read slightly high, because there is 42mV offset.
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