Answer / honey sekar

Because OF that Bently nevada probe proximitors are made by
PNP principle ,some of proximitor's we are using +24 vdc
which was made by NPN principle in few plant's

Answer / taha

to generate frequency required -24v as minimum

Answer / s n vyas

For High speed rotating equipment only, we are using this negative voltage for vibration sensor. This negative voltage is always set as gap voltage between the sensor and surface of the rotating equipment. This gap voltage is always set as -10Vdc. This because of Ratio frequency, which is created by the controller of vibration sensor. These frequencies are generated under negative voltage only. Which is also varies with respect to eddy current flow. The amplitude of this ratio frequency is measured as vibration. For your information, Noise level is very less in negative voltage compare than positive voltage which will not affect the sensitive range of measurement of vibration. For your information:-This concept is used in Bently Nevada vibration monitoring system.

Answer / ashok

1. Equipment needs safe
2. If cable damaged the prox- tip not to make short with
card which convert in to mA

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