What is the current source function used for?

The current source function can be used for manual setting of the mA value at the output of the pressure transmitter to a defined value, regardless of the actual pressure prevailing at the moment.

This saves having a separate current source.

This makes it easy to test the 2-wire current loop circuit.

For example:

  • Is the supply voltage still adequate at 21.5 mA?
  • Is the display on the PLC functioning properly?
  • Does a contact (if used) switch when the limit value is reached? etc.

The current source function is standard for all HART instruments.