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What is the function of "Zero Switch" in SPD310/SPD360 Sensor.

If  "Zero Switch" has been pressed and hold the for 2 seconds then the pressure differential will reset to zero. This needs to be performed when both positive or negative pipes are disconnected.
It should only be necessary to perform a reset if there is reason to believe that the analogue output signal is not as expected.

Please refer the attached instruction sheet.

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