How to Select Vibration Sensors             Image credit: PCB Piezotronics | Electro-Sensors, Inc. | Dytran Instruments   Vibration sensors are sensors for measuring, displaying, and analyzing linear velocity, displacement and proximity, or acceleration.   Purpose of Vibration Measurement Vibration — however subtle and unnoticed by human senses — is a telltale sign of machine condition. Abnormal vibration...
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Q & A on Vibration Sensors

We asked our users for their input on Vibration Sensors. Here are the results of 85 users familiar with Vibration Sensors.

Who Took Our Poll? | Design Trends | Applications and Use | Features | Buying Advice

Who Took Our Poll?Top

Design TrendsTop

Q:
What new technologies are influencing vibration sensor design?
13 answers
Answers:
Direct output of 4-20mA for ancillary plant items.
~Flash G, Maintenance Technician, Hamilton, NZ
Electronic have made the sensors smaller.
~Albino O, Mechanical Engineer, Quezon city, Philippines
Microelectro mechanical systems MEM's
~Gilberto Loera Medrano, Engineer, Queretaro, Mexico
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Q:
From your perspective, which companies are creating the most innovative vibration sensors?
13 answers
Answers:
Metrix? Mainly using Bently Nevada, but their pricing has gone crazy since GE took over.
~Flash G, Maintenance Technician, Hamilton, NZ
Bruel & Kjaer PCB freescale national semiconductors
~Gilberto Loera Medrano, Engineer, Queretaro, Mexico
Taiwan maybe is leading the vibratory sensor
~Albino O, Mechanical Engineer, Quezon city, Philippines
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Applications and UseTop

Q:
What are some of the applications you have used vibration sensors for?
24 answers
Answers:
I use Bently Nevada vibration sensors for monitoring and protection of steam turbines, compressors and other rotating machinery.
~Engineering, Faculty/Staff/Student, Varna, Bulgaria
Vehicles - ride comfort. Engines - Satellites - Ground Vibration - Machinery, predictive maintenance
~Kuno M, Engineer, Singapore, Singapore
Characterization and measurement of vibration systems vibration test low frequency measurement
~Gilberto Loera Medrano, Engineer, Queretaro, Mexico
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Q:
Please share with us any “non-standard” applications that vibration sensors have been used for.
8 answers
Answers:
Machining of metal with large dept of cut can be study the minimum and maximum thickness of material use to absorb vibration.
~Albino O, Mechanical Engineer, Quezon city, Philippines
What is "standard" or "non-standard"? The field of applications is huge.
~Gerd R, Engineering Consultant, Darmstadt, Germany
Body Vibration measurement on elder people to react to a fall
~Kuno M, Engineer, Singapore, Singapore
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Q:
Do you know of any disastrous mistakes that occurred due to the incorrect usage of vibration sensors?
7 answers
Answers:
A gas turbine which had only seismic sensors was destroy blade wheels and it was noticed by seismic sensor as moderate vibration. When some provisional proximity probes were installed the problem appeared clearly detected by the proximity probes as severe vibration.
~John R, Project and Field Service Engineer, Bogota, Colombia
Damaged cables by fitters unscrewing sensors without electrical disconnection, destroying cables. Loose metal ID labels being attached to sensors where they could vibrate on their own.
~Flash G, Maintenance Technician, Hamilton, NZ
There was a train disaster caused by defective wheels, which I believe could have been avoided using vibration monitoring .
~Gerd R, Engineering Consultant, Darmstadt, Germany
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FeaturesTop

Q:
What would your design or feature "wish list" be for this product?
12 answers
Answers:
Practical product support. Bently Nevada have been pretty useless at supporting product when issues arise, in our case signals going open cct for unknown reasons. They will not assist with fault checking of suspect devices, only interested in selling new units. mA outputs to allow signals to be sent over extended distances without degrading or being influenced by surrounding plant. Reliable plug in system to allow for easy disconnection and high waterproof integrity. Plug and receptacle is suspected to be an issue for us with existing Bently Nevada's, but has been blamed on old monitors which may be the case also, but when we have replaced monitors in some cases the issues continued. Most issue occur when item is out of service, hence low real vibration environment. Suspect when in service plant vibration keeps contact viable through constant movement.
~Flash G, Maintenance Technician, Hamilton, NZ
3-axis, time and frequency domain, active sleep mode with threshold interrupt possibly integrated in sturdy design
~Research & Development, Haarlem, Netherlands
Configuration settings saved as icons ready for playback for various applications
~Marketing/Sales, Maryville, TN
Wide band High sensitivity Cross-sensitivity
~Yuan-Fang Chou, Faculty/Staff, Taipei, Taiwan, ROC
Reduced size and lower power consumption
~Engineering, Design, Leon, Spain
Its characteristics of work and prices
~Gilberto Loera Medrano, Engineer, Queretaro, Mexico
Integrated energy and datalogger
~Paulo valerio V, Acustic, Sarilhos pequenos, Portugal
Self calibrating sensor
~John Grech, Engineer, Sliema, Malta
Size and portability
~Technical Support/Services, Perth, Australia
Improvements in EMC
~Gerd R, Engineering Consultant, Darmstadt, Germany
Lower cost
~Steve M, Engineer, Appleton, WI
Cableless
~Kuno M, Engineer, Singapore, Singapore

Buying AdviceTop

Q:
Do you have any advice for people relative to buying or using vibration sensors?
8 answers
Answers:
Insulation, isolation, segregation and high quality installation are critical. Avoid earth loops at all costs. Look hard at end use to establish the suitable level of technology for the application. Vibs are sold on what they are capable of doing in the hands of an expert and within expensive software and hardware systems. There seem to be few people out there who diagnose the results and give any practical advice on what actions to take on the results. Much of it seems to be record for the sake of recording, but when an issue arises, no-one is certain what actions should follow.
~Flash G, Maintenance Technician, Hamilton, NZ
Understanding your machine, the process they carry on, and what you are monitoring and how you are doing it is essential and can save you a whole lot of money.
~John R, Project and Field Service Engineer, Bogota, Colombia
Carefully check the sampling rate and filtering of data acquisition compared to the resonant frequency of the sensor (to avoid aliasing).
~Design Engineer, San Clemente, CA
Study something about them before buying, buy an calibrator or a regulated shaker so you may generate and really measure real vibrations.
~Paulo valerio V, Acustic, Sarilhos pequenos, Portugal
Yes, only the people need to know the intervals in frequency and amplitude to measure
~Gilberto Loera Medrano, Engineer, Queretaro, Mexico
Be sure the mounting is ok and the shock wave can not damage the sensor
~Albino O, Mechanical Engineer, Quezon city, Philippines
Spend attention on the DAQ system that follows the sensor
~Kuno M, Engineer, Singapore, Singapore
Better use the better sensor, not the cheaper one
~Gerd R, Engineering Consultant, Darmstadt, Germany


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