Pressure Transducer Calibration (Fast Fill & Temperature
Compensated Units Only)
Pressure Transducer Calibration (Fast Fill & Temperature
Compensated Units Only)
Calibrating the dispenser pressure transducers involves two steps:
1. Determine the transducer gain. Compare the dispensers gauge
pressure to its electronic pressure reading to determine and set the
correct transducer gain.
2. Adjust the transducer gain by adjusting the dispenser’s electronic
pressure reading to match the actual pressure.
The pressure transducers are calibrated at the factory and
usually do not require recalibration.
Determine transducer gain
1. Degas the dispenser (see page 40) and close all outlet isolation valves
2. View and note down the current transducer gain (TG) setting for the
transducer to be tested. Pressure Transducer Gain (see page 31)
3. Turn on the gas to the dispenser.
4. Remove the nozzle from its holster or press the start button, allowing
gas to pass through the dispenser.
5. Slowly open the outlet isolation valve and watch as the pressure gauge
begins to rise. Shut the valve when the reading is approximately 100
bar.
6. Hang up the nozzle.
7. View and record the electronic pressure reading for the pressure
transducer. This value is D1.
8. Record the value on the dispenser gauge. This value is TG1.
9. Remove the nozzle from its holster again or press the start button.
10. Increase the gauge pressure to approximately 200 bar.
11. Hang up the nozzle.
12. View and record the electronic pressure reading for the pressure
transducer. This value is D2.
13. Record the value on the dispenser gauge. This value is TG2
14. Calculate the new gain using the following formula:
Adjust the transducer gain
Input the new gain. Refer Pressure Transducer Gain (see page 31)
Adjust the electronic pressure offset
Adjust the electronic pressure reading to equal that displayed on the
dispensers pressure gauge using the following procedure:
1. Use the "K" factor switch to display the pressure reading.
2. Press and hold the "K" factor switch to change the display to equal the
pressure on the gauge.
3. Allow the "K" factor setting to time out.
4. Re-check the pressure at 100 and 200 bar gauge pressure to see if
display and gauge read the same.
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