Assigned a new task to add a thermocouple measurement to your PLC system, you ask yourself “How do I connect a thermocouple to a PLC?”.
Thermocouple transmitters allow thermocouples to signal conditioned to be more easily used.
A thermocouple is a low cost flexible temperature sensor.
The thermocouple transmitter converts the thermocouple voltage change to 4-20mA current change. The 4-20mA signal allows the thermocouple , when using a thermocouple transmitter, to be connected to a PLC. This allows thermocouples to be used as a part of a modern control system.