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Participant

Join Date: Jun 2019
Posts: 1

BN Accelerometer Probe Configuration Issue

06/28/2019 5:58 AM

Bentley nevada accelorometer probe 330400-02-05 is connected to BN3500 rack and configured. The full scale range is select 0-25 mm/s peak and selected the integrate box. The acceleration range mentioned on the data sheet for the probe is 490m/s2 (50g) peak. As per my understanding, the probe acceleration range should be within the rack's scale range.

I personally removed the integrate option and tried to reconfigure but the rack's maximum range is 0-20 g/peak.

Please suggest the provided configuration is correct or not? We are observing very low vibration value when the pump running. Again, the function check by portable shacker is providing 0 vibration and i doubt this happening due to the selection of integrate.

Low pass filter is not selected and high pass filter selected 10Hz??

Recorder output direct Amplitude.

Channel frequency support 10-9.155Hz.

Transducer selection: 330400standard integral acceleration.

Expecting your valuable replies.

Thanks,

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Guru

Join Date: Dec 2010
Posts: 1621
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#1

Re: BN accelerometer probe configuration issue

06/28/2019 12:06 PM

To be clear, what you want is 25mm/s full scale??

1/ Bentley nevada accelerometer probe 330400-02-05 is specified as 100 mV/g output. That is acceleration, so you MUST have an integrator in the loop - I assume the amplifier in the rack provides this. So any operation with "integrator OFF" will not make progress.

2 The probe spec writes output -8.5 +/- 0.5 volts (static) - so what do you measure to common of probe a) as connected b) with "out" wire of probe disconnected at rack [eliminates trouble in rack from probe]. c) what is power out to probe [-24??]?

This should rule out "wire off" between probe & rack & basic problem with probe.

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Guru

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#2
In reply to #1

Re: BN accelerometer probe configuration issue

06/28/2019 12:36 PM

I should have written "25 mm/s peak full scale" and

3/ What is pump rev/min?

4/ What is alarm/alert level given mm/s?

5/ what is shutdown level mm/s?

6/ What is expected vibration indication, normal pump running?

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#3

Re: BN accelerometer probe configuration issue

06/28/2019 10:25 PM

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Guru

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#4

Re: BN accelerometer probe configuration issue

06/29/2019 5:57 AM

25 mm/s peak @ 60Hz [equivalent 3600 rev/min] sine wave is 0.96g peak, so full scale is about 100mV peak, 70 mV rms from probe.

This should be readable on a good multimeter, AC range, supposing your Shaker table gives that level.

Unless this is a one channel system, are any other channels working OK with accelerometer? If there are, have you tried swapping this probe to another channel or swapping amplifiers between rack positions?? Or comparing configuration settings on a working channel?

If this is a 3600 rev/min turbine compressor, normal run at 2 mm/s is possible.

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