Bently Nevada 3300 System Gap Voltage


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we have Bently Nevada GE 3300 vibration measurement system. why gap voltage of any proximity sensor is set -10 mv? is there any particular reason for doing this? please explain.

Instrument engineer at reliance
email: [email protected]
Vibration probes are installed at a distance of the shaft equal to ca. - 10 Volts (not mVolts). Values in between -9 and -11 V are usually accepted as correct gap voltages. It is so because that is the center of the linear range of the sensor output (usually the linear range goes from 2 to 21 Volts or so). Note that this is true for 5/8mm tip diameter probes, other probes have different ranges.

Check the datasheets of the probes, you should see the output curve in there.