Output signal from Bently Nevada monitors
Output signal from Bently Nevada monitors
(OP)
I plan to purchase a portable vibration analyzer for performing diagnostics on rotating machinery. Most machinery I work with is equipped with a permanently installed vibration monitoring system, such as the GE Bently Nevada 3000 & 7000 series systems. Most large turbomachines are equipped with eddy current displacement probes, which necessitates analyzing the buffered output signal from the permanently installed monitor.
In order to specify the right analyzer I need to know what the output characteristics are for the buffered output from the Bently Nevada monitors, e.g. voltage range.
Does anyone here know what the output characteristics are?
Thank you for your help.
In order to specify the right analyzer I need to know what the output characteristics are for the buffered output from the Bently Nevada monitors, e.g. voltage range.
Does anyone here know what the output characteristics are?
Thank you for your help.





RE: Output signal from Bently Nevada monitors
Johnny Pellin
RE: Output signal from Bently Nevada monitors
Thank you for the information on the CSI system.
I've already spoken with GE who would no doubt prefer I buy an ADRE or Snapshot system.
One engineer at GE informed me that gap voltage (-10 vdc) plus peak AC 0-pk vibratory voltage are supplied to the buffered outputs. Another very experienced source tells me that only the AC component of the vibration signal is sent to the buffered outputs from the proximetor.
Some of the portable analyzers inputs have a published maximum range of +/- 5 volts. Some sources say the +/- 5 v limit applies only to the AC component of the signal.
I'd much prefer that the analyzer manufacturer do the necessary research regarding compatibility of their system with the Bently gear, but they never follow through. Most of the analyzer mfgs are not machinery people and just want to sell analyzers.
Kind regards,
Tom
RE: Output signal from Bently Nevada monitors
Johnny Pellin
RE: Output signal from Bently Nevada monitors
RE: Output signal from Bently Nevada monitors
I would caution against buying a Snaphot - the System 1 software is 'not very good' and the ADRE system is an inappropriate tool for this application
RE: Output signal from Bently Nevada monitors
The ADRE system is commonly used for the job I need to do, but it is too bulky for my purposes and too expensive compared to the competing products.
I'm not looking for a route-based data collector type system. I'm looking for a quality engineering tool to perform diagnostics such as vibration analysis and modal analysis associated with critical process turbomachinery.
RE: Output signal from Bently Nevada monitors
Just in case you're wondering, I am an enduser in the oil/gas industry and nothing to do with IOTECH. And yes...I do have a Snapshot
RE: Output signal from Bently Nevada monitors
The IOTECH looks like a great piece of kit. It certainly fits the bill in terms of functionality, but the analyzer costs $10k plus another $4k for the software. I'm an independent contractor and 14 smackers is more than I want to spend. If a cheaper system leads to a significant amount of work, and more functionality is required, then I'd consider upgrading to something more powerful.
I'm also an end-user in the oilpatch. I'm interested in the approach taken by vibDaq using off the shelf components from National Instruments together with LabView. Their system costs $4500 incl software. They're local in San Rafael and will loan me a demo. It very much depends on the functionality of their software.
Kind regards,
Tom
RE: Output signal from Bently Nevada monitors
In my experience that rapidly thrifts out the wannabees, and frightens all of them.
Cheers
Greg Locock
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