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MarkL

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Hi guys im been asked to look at a system to monitor a decanter in an Aztec area. They want to feed back to scads to historically trend and have records of the overalls. Any suggestions? I am not familiar with 4-20ma setups but imagine they are
More akin to a protection system than predictive Maintenance capability? (Early bearing deterioration warming etc)

Any suggestions would be great.

Many thanks
Walt Strong

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I believe you want ATEX certified vibration sensor with 4-20 ma current loop input to SCADA such as this one:

http://www.monitran.com/News/entryid/18/certified-for-use-in-hazardous-areas

Your misspellings caused some guessing on my part!

Walt
Walt Strong

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Mark,

Here is another product line for ATEX sensors:

https://www.ctconline.com/hazardous_area_products.aspx

Walt
MarkL

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Sorry Walt combination of iPads auto correct and my habit of typing like I talk' is a bad combo.

Is 4-20 enough for early bearing warning though? I imagine it was same as having a protection system monitoring velocity overall, than indicator of early bearing wear which can be mitigated? Of course I stand corrected.
Walt Strong

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Mark,

You would probably have a choice of overall velocity or acceleration, which may not give early warning of bearing fault. That's the situation with SCADA monitoring. Other options would be to have dual output sensor or Transmitter with dual output with analog dynamic signal for periodic monitoring with portable analyzer or an independent monitor with waveform and spectrum analysis capability. The instrument and controls person may want to monitor vibrations, but the condition monitoring person has other requirements and responsibilities.

Walt
Curran919

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Reply with quote  #6 
Quote:
Originally Posted by MarkL
Sorry Walt combination of iPads auto correct and my habit of typing like I talk' is a bad combo. Is 4-20 enough for early bearing warning though? I imagine it was same as having a protection system monitoring velocity overall, than indicator of early bearing wear which can be mitigated? Of course I stand corrected.


Not all 4-20 output accels are limited to using overall broadband values as their output. There are a few selectable options where you can switch between broadband velocity and acceleration, and I recall even seeing one where there are two parallel, bandwidth-configurable 4-20 outputs from one sensor. These things tend not to be ATEX, but I could be wrong.
MarkL

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Reply with quote  #7 
Thanks Walt and Curran,
Yes I understand the requirements of an instrumention guy and a vibration guy are vastly different as the former thinks 'surely that's all you need' i.e. Overall vibrtaion v raw acceleration for analysis is what we(analysts use)


I'm going to talk to the sensor makers and see what they suggest just wanted a non commercial opinion first. Thanks again.



OLi

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Reply with quote  #8 
Vendor,
Jumping on that, if you have a ATEX sensor, a zener barrier and on the safe side you can have this
http://www.vtab.se/products/monitoring/va43tn/?lang=en
where you can have 1 x 4-20mA output for ISO 10-1000Hz and 1x 4-20mA output for our special L-method bearing condition :-)


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Curran919

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Reply with quote  #9 
Quote:
Originally Posted by OLi
Vendor,
Jumping on that, if you have a ATEX sensor, a zener barrier and on the safe side you can have this
http://www.vtab.se/products/monitoring/va43tn/?lang=en
where you can have 1 x 4-20mA output for ISO 10-1000Hz and 1x 4-20mA output for our special L-method bearing condition :-)



Oli,

Does that interface with any IEPE accel? Or is it only shipped with accels that you design into them?

I would be very interested in a small rail mount 'DAQ' that is USB configurable to different bandwidths and integrations that reads in the instantaneous accel signal from an IEPE sensor and outputs 3-6 4-20mA channels. I don't think it exists right now...
Walt Strong

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Reply with quote  #10 
Mark,

Here is another dual output transmitter that can be used with ATEX accelerometer and zener barrier:

https://www.pcb.com/contentstore/mktgContent/IMI_Downloads/IMI-682B05_LowRes.pdf

Here is a typical ATEX accelerometer from several models:

https://www.pcb.com/products.aspx?m=EX603C01

If you open the Manual PDF and look at the last few pages, it will show the ATEX certificate and the required connecting circuit. 

I have not used this product, but is both interesting and expensive.

Walt
OLi

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Reply with quote  #11 
Hi
Yes any normal 100mV/g.
Take a look at this as an alternative.
http://www.vtab.se/products/on-line/m8/?lang=en
Is it lo speed or hi speed device?

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Good Vibrations since early 1950's, first patented vibrometer 1956 in the US.
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