Disconnect the wires connected to the pressure switch by pulling the wire connectors off of the switch terminals. Set a multimeter to test for resistance (ohms). Touch each tester probe to one of the switch terminals. The tester should read 0 or close to 0 (indicating no resistance).

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How to Test a 4-20 mA Pressure Transducer?

1. Connect the positive terminal of the transducer to the positive terminal of the power supply.
2. Connect the negative terminal of the transducer to the positive lead on the multimeter.
3. Connect the negative lead of the multimeter to the negative terminal on the power supply.

How to perform the test

1. Connect the transmitter test hose from the calibrator to the transmitter.
2. Connect the mA measurement jacks of the calibrator to the transmitter.
3. Set the pressure/vacuum selection knob to the necessary function.
4. Close the vent knob and supply metering valve.

Pressure Transmitter Troubleshooting Tips

1. Verify power is applied to signal terminals.
2. Check power wires for reversed polarity.
3. Verify terminal voltage is 10.5 to 42.4 Vdc.
4. Check for open diode across test terminal.

How to Calibrate a Rosemount 1151 Pressure Transmitter

1. Apply 4mA point pressure and turn zero screw to output 4mA output.
2. Apply 20mA point pressure.
3. Subtract actual output from the desired output of 20mA.
4. Divide the difference by 3.