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What is the current source function used for?

pressure_t2q3

The current source function (parameter P8) 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.

Possible settings:

3,85 mA
-
Underrange
4,00 mA
-
Measurement range 0%
12,00 mA
-
Measurement range 50%
20,00 mA
-
Measurement range 100%
21,50 mA
-
Overrange