User Manual Q&AAnswer
Feb 27, 2025 - 07:41 AM
To calibrate the Ashcroft E2S Pressure Transducer, follow these steps:
1. Disconnect the transducer from the control system before performing any calibration adjustments.
2. Activate the calibration mode by cycling the power off and on, and then tapping the Ashcroft calibration magnet near the specified area on the E2S label within 30 seconds. The initial code to enter the calibration mode is 1-3-1 (tap the unit for one second, release, tap the unit for three seconds, release, tap the unit for one second, release).
3. Once the calibration mode is activated, the output signal on the transducer will drive from over range to under range.
4. At the offset pressure, record the output offset to be used in the span adjustment. Increase the pressure to 100% of the span to adjust the span of the unit. The span is adjustable to +/- 5% of full scale.
5. Tap the magnet near the specified area on the E2S label and adjust the span to the desired span value plus the offset value recorded in step 4. The span will increase from its current value up to +5% of scale. Once the output has reached the maximum value, the span will jump to -5% and continue to increase. Holding the magnet in position while adjusting the span will increase the speed at which the span increases or decreases. If you scroll past your desired value, repeat step 5 until you have reached your desired span value.
6. Decrease the pressure to 0% of the span to adjust the zero of the unit. The offset is adjustable to +/- 5% of full scale.
7. Tap the magnet near the specified area on the E2S label and adjust the offset to the desired value. The offset will increase from its current value up to +5% of scale. Once the offset output has reached the maximum value, the zero will jump to -5% and continue to increase. Holding the magnet in position while adjusting the offset will increase the speed at which the offset increases or decreases. If you scroll past your desired value, repeat step 7 until you have reached your desired offset value.
8. Once you have completed the calibration adjustments, you can repeat steps 5 to 7 to further adjust or check your calibration.
9. After 30 seconds of magnetic inactivity, the unit will exit the calibration mode. This will be signaled by the output of the transducer driving to over range, under range, and back to the normally calibrated output.
Note: It is important to follow the instructions provided in the manual and consult Ashcroft Inc. if you have any questions or concerns before performing the calibration.
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