Sign up Calendar Latest Topics Donate
 
 
 


Reply
  Author   Comment  
newvibe

Member
Registered:
Posts: 9
Reply with quote  #1 
Hi guys,

I am looking to collect vibration data for the motor and fan in air handling units. Due to safety reasons, I cannot be in the room where the motor and fan are when the unit is operating. Also, the access door has to be fully closed so no chance of leaving the door slightly open and run a cable out. Install permanent sensors is too expensive as there are many units to be done and the client only want to spot check them maybe once a year.

I am looking at a Frontier wireless sensor/transmitter, hoping it can transmit the signal out through the closed rubber sealed door.

How do you do yours? any recommendations?

Thank you.
Curran919

Avatar / Picture

Sr. Member / Supporter
Registered:
Posts: 452
Reply with quote  #2 
I'd be worried about a wireless transmitter being able to transmit through the walls/door if its anything more than some aluminum and insulation. Is the room really airtight? You can't run an extension cable through some gland somewhere? And why can't you leave your recorder in the room on a continuous acquire and have them start up and shutdown while you're waiting outside?
Dave Reynolds

Member
Registered:
Posts: 39
Reply with quote  #3 
newvibe

https://sensors.waiteswireless.com/

Vendor alert, here is a possible option, can be setup to collect data every minute, trend/spectrum/waveform/temperature.

Just came out with a triaxial battery operated unit for under $500 USD sensor.jpg 

 
Attached Files
pdf Waites Wireless Sensor Technology.pdf (1.16 MB, 6 views)

newvibe

Member
Registered:
Posts: 9
Reply with quote  #4 
@curran919: Yes, that is also my concern on the wireless sensors. The room is airtight. Running cables through a gland is an option, however, I will have to drill through the wall to install the gland and then have to block it after use. I want to explore other options first. I have not try continuously acquiring data with my data collector (only in route and live mode). I will look into this option. Thank you for your input.

@Dave Reynolds: Are these sensors stand-alone sensors where each sensor can collect and save their own data? And I will be able to upload the data collected to a software/database for analysis?
fburgos

Sr. Member
Registered:
Posts: 425
Reply with quote  #5 
check this wireless sensor and receiver with BNC output

https://www.erbessd-instruments.com/wireless-accelerometer
newvibe

Member
Registered:
Posts: 9
Reply with quote  #6 
thanks fburgos
MarkL

Avatar / Picture

Sr. Member
Registered:
Posts: 902
Reply with quote  #7 
Vendor Alert
Are you using an analyzer currently ? if so what type? we have a partner for wireless system low power RF 200 m line of sight sensor to the gateway. They have an international presence working in North America South America and Australasia.
http://www.sensoteq.co.uk wireless sensor 4-5 years battery life rms and temp every 2 minutes twf and fft every 12 hours.
Dave Reynolds

Member
Registered:
Posts: 39
Reply with quote  #8 
Yes sensors are standalone, either bi-axial or triaxial both with temperature

You setup the equipment naming and point info, each sensor each direction and temp are customizable for data collection, fmax 2500hz or 11000hz

Collection overall vibration trend/temp once per hour and spectrum/waveform 1/day the batteries last approx 2 years. Option for line powered node/repeater

Database/software is in the cloud, annual costs for subscription/data storage/cell phone
OLi

Sr. Member
Registered:
Posts: 1,478
Reply with quote  #9 

Vendor we work with WiCare, available world wide in all places that US systems not always do. It got extensive references in Cement industry as it cover wide areas with extenders and
in petrochem as it is Ex native standard 3-axis and 1-axis data in cloud etc. HMI for FFT analysis do use MT/ CSI quirky quick key as many as there possible can be I must say as  the developers are former CSi Europe analysts and consultant crew.... knock yourself out.....

http://www.vtab.se/products/on-line/wi-care/?lang=en



__________________
Good Vibrations since early 1950's, first patented vibrometer 1956 in the US.
http://www.vtab.se
Walt Strong

Sr. Member
Registered:
Posts: 709
Reply with quote  #10 

"I am looking to collect vibration data for the motor and fan in air handling units. Due to safety reasons, I cannot be in the room where the motor and fan are when the unit is operating. Also, the access door has to be fully closed so no chance of leaving the door slightly open and run a cable out. Install permanent sensors is too expensive as there are many units to be done and the client only want to spot check them maybe once a year."

 

I recommend survey 4-times per year. Temporary setup of 4-accelerometers inside enclosure is about 5-minutes. The 4-accelerometers with attached magnet are pre-wired (10-ft) to a CAT-5 Adapter that is simply plugged into permanent CAT-5 Bulkhead Adapter inside the enclosure. A pre-wired CAT-5 Adapter with BNC patch cables is plugged into the exterior of the CAT-5 Bulkhead Coupler and connected to the to the vibration analyzer. The Survey Time includes machine stop, install accelerometers (5-minutes), machine startup, vibration measurements with portable analyzer (1, 2 or 4-channels), stop machine, accelerometer removal (<5-minutes), machine startup.

 

Complete Temporary/Permanent Accelerometer System for 2-fan bearings and 2-motor bearings in HVAC Enclosure using stock components:

4-Magnets, 4-Accelerometers, CAT-5 Adapter, CAT-5 Bulkhead Coupler, CAT-5 Adapter (included), 4-BNC Patch Cables. The total cost is less than $1000.00 for materials. This method requires drilling about 0.75" diameter hole in enclosure wall at convenient access location for water and dust proof CAT-5 Bulkhead Coupler.

The Frontier wireless sensor is nearly $2000.00 each or nearly $8000.00 for four bearings. The amplitude and frequency response was not available. Compare proven measurement performance that costs about $1000.00 for a wired system to an unproven sensor performance that costs nearly $8000.00!! The other wireless sensors mentioned could be a good choice for permanent monitoring, but they would probably use different software than your portable analyzer system.

I have made several BNC to CAT-5 adapters and made measurements over 500-ft from ICP accelerometers, optical tachometer, and sound meter. The CAT-5 cable has 4-pairs of twisted shielded wires, so there is good signal transmission quality. There are many CAT-5 cables and components available at low cost.

Walt

OLi

Sr. Member
Registered:
Posts: 1,478
Reply with quote  #11 

I run RG58 koax and BNC/ BNC cable, there are (isolated) bulkhead versions of the BNC/BNC tooo. Used that last many years to.

Just found out that we celebrate proven 20 years on internet this year our vtab.se have on waybackmachine site a log on Nov 1999 where the
webpage I made still can be found as a reference. I remember doing it when I saw it w. nice yellow backdrop color..... I will try to extract a link.

Here it is, only Swedish at that time but anyway pretty much the same:

http://web.archive.org/web/19991118194728/http://www.vtab.se/


also in English back then:

http://web.archive.org/web/19990912234106/http://www.vtab.se:80/index_e.htm




__________________
Good Vibrations since early 1950's, first patented vibrometer 1956 in the US.
http://www.vtab.se
newvibe

Member
Registered:
Posts: 9
Reply with quote  #12 
Hi guys.

It seems like wireless sensors is not an option as the signal response is just too unreliable for my application. I am now leaning toward the temporary/permanent option that Walt, Curran919 and Oli recommended.

"Complete Temporary/Permanent Accelerometer System for 2-fan bearings and 2-motor bearings in HVAC Enclosure using stock components:

4-Magnets, 4-Accelerometers, CAT-5 Adapter, CAT-5 Bulkhead Coupler, CAT-5 Adapter (included), 4-BNC Patch Cables. The total cost is less than $1000.00 for materialsThis method requires drilling about 0.75" diameter hole in the enclosure wall at convenient access location for water and dustproof CAT-5 Bulkhead Coupler."

Thanks very much for everyone recommendations.  

Walt Strong

Sr. Member
Registered:
Posts: 709
Reply with quote  #13 
Newvibe,

If you want a list of suggested system components, then sent me a PM.

Walt
Previous Topic | Next Topic
Print
Reply

Quick Navigation:

Easily create a Forum Website with Website Toolbox.