Axial Probe Setting

Is the deviation is acceptable? How does it relate to the out-of-balance condition?

What is the impact if we change the voltage reference to minimize the deviation? False readings.

Friend,

I would recommend you make a test to both probes with a TK-3 in order to get the relation between distance and Volts.

Normally the relation between distance/volts is 200mV/mils, this depending of target material and probe used, I mean if you have a axial displacement of 5 mils the voltage produced will be 1 volts. Of this form you will know if the probe+proximitor+extension cable are working good.

According your case the difference is about 3,45 mils, If you see your Bently Nevada Display you will have this difference present too.

Imagine that your trip value by axial displacement is 15 mils, then due this different voltage between A and B, one of these probes will be reaching the trip first, of course this one of the reasons why you have two probes (redundancy).

Therefore, when the shaft is on the middle you will need adjust the zero position on the monitor with the Bently Nevada Software.

These axial displacements probes are one of more difficult of adjust.

(Rotating team push the shaft to the center) <--- in this moment both probes reading must be zero on the display. If not you need to do the adjust with the software on the monitor associated to these probes.

If you want to have a good knowledge contact to Bently Nevada technical Staff

Best regards

JP

Thanks lyn and JP

Hello,

I wrote an answer to you but then I realized it had been answered already. Now I am making changes to my answer and since there is not option to delete, I am posting it.

Good answers, though. :)

If by redundant probes you mean that both are installed on the same end of the shaft then there is no reason for an offset of .6 volts.

What does the monitor report as the shaft position in regards to probe A and B.

You could override the trip and swap the probe wiring to see if the offset moves with the wiring or stays on the same monitor channel.