Thermocouple amplifier (ISO122P/124, INA101) circuit diagram

Published:2011/5/10 21:45:00 Author:Ecco | Keyword: Thermocouple , amplifier | From:SeekIC

The thermocouple amplifier circuit composed of ISO122P/I24 and INA101 instrumentation amplifier, REF102 voltage reference is shown as the chart, it has the features of loop elimination, cold junction compensation and the high scale turning off end. Thermocouple can test temperature in the field, the temperature signal is converted to voltage signal and amplified by instrumentation amplifier INA101 and sent to ISO122P/124, and it is isolated amplified output by the ISO122P/124. The resistor RG is used to set the INA101 gain. The circuit is characterized by a thermocouple connecting to the ground of ISO122P/124 secondary side, that is the formation of the same potential, thereby it eliminates the interference caused by ground loops. Diode 1N4148 is the cold junction compensation of the thermocouple, 1MΩ resistor constitutes the high-end off circuit. The type and parameters of ISA are listed in the table below.



Reprinted Url Of This Article:
http://www.seekic.com/circuit_diagram/Amplifier_Circuit/Thermocouple_amplifier_ISO122P_124_INA101_circuit_diagram.html

Print this Page | Comments | Reading(3)