User Manual

ADC-20/ADC-24 Terminal Board User Guide Pico Technology
10 DO117-5
2.5.4 Thermocouple
This device has to be used in conjunction with the AD595 IC. The circuitry involved in
connecting to the ADC is the most complex of the three types and great care should
be taken if choosing this method.
The AD595 IC is an integrated thermocouple instrumentation amplifier with built-in
cold junction compensation. The diagram below shows how to connect the AD595 IC
and the thermocouple to the terminal board. The output voltage is not linear with
temperature, so you will need to consult the table in Appendix 2 to convert the
voltages to temperatures.
Temperature sensor circuit with thermocouple and AD595