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Doc.Ref.No.:mVMT/om/101

           

 

 

 

 

                                         

masibus 

Issue No.   :00 
Model        : VM908

                     

 

 

Operator’s Manual VM-908 Vibration meter

                                                                                              

Page 3 of 11

     

 

02/05/16

 

 

 

 

 
 
 
 
The information provided in this Manual is believed to be reliable. However, the manufacturer assumes no 
responsibility for inaccuracies or omissions. The manufacturer assumes no responsibility for the use of this 
information,  and  all  use  of  such  information  shall  be  entirely  at  the  user's  own  risk.  Specifications  are 
subject to change without notice. No patent rights or licences to any of the functions described are implied 
or granted to any third party. The manufacturer does not authorise or warrant any of the products for use in 
life support devices or systems. 

 

 

 

1.

 

TECHNICAL DETAILS 

 

Masibus  VM908  vibration  meter  is  a  basic  portable  vibration  measurement  product  that  reads  vibration in 
various modes. It provides essential periodic monitoring of fan, pump, motor and other industrial machines. 
It  measures  the  vibration  to  which  it  is  exposed  and  provides  corrective  action  when  vibration  exceeds 
predetermined threshold values.   
 
Vibration meter is a strategic tool for predictive maintenance. It offers digit display of vibration in terms of 
displacement,  velocity  and  acceleration.  It  measures  off  line  vibration  and  provides  easy  evaluation  of 
health of machines. On this basis further analysis can be done using vibration analyzer for diagnosing the 
machine  problem.  Masibus  has  a  proven  track  record  of  manufacturing  portable  instruments  and  online 
process monitoring instruments for over 3 decades. Vibration  meter makes cost-effective off line vibration 
monitoring instrument with various important parameter i.e. displacement, velocity, acceleration. 
 
Vibration is measured in terms of R.M.S. and peak. When overall vibration is to be measured, R.M.S. and 
peak measurement technique is considered best for general machine health. 
 
VM908 is very handy easy to use device for any maintenance crew. It gives very easy understanding of 
equipment health and guides for repairs. 

 

 
 
      

2. SPECIFICATION 

 

 Measurement condition: 

 

Temperature :

 5-50

o

C,  

 

Humidity 

< 85%,  

 

Non-causticity environment, without strong electric-magnetic field & strong impact 

 

 

Amplitude Ranges: 

 

1.

 

Displacement:

 1

1999

m   peak-peak (*) 

2.

 

Velocity:

    0.1

199.9 mm/s   true RMS 

3.

 

Acceleration and High Frequency Acceleration:

 0.1

199.9 m/s

2

  peak (*) 

 

*Note: 

peak-peak and peak are equivalent value means: peak- peak = 2.828*RMS while peak=1.414*RMS 

Summary of Contents for VM908

Page 1: ...1 of 11 02 05 16 Operator s Manual V VM M9 90 08 8 V VI IB BR RA AT TI IO ON N M ME ET TE ER R Masibus Automation And Instrumentation Pvt Ltd B 30 GIDC Electronics Estate Sector 25 Gandhinagar 382044 Gujarat India Ph 91 79 23287275 79 Fax 91 79 23287281 82 Email support masibus com Web www masibus com ...

Page 2: ...Doc Ref No mVMT om 101 masibus Issue No 00 Model VM908 Operator s Manual VM 908 Vibration meter Page 2 of 11 02 05 16 CONTENTS 1 TECHNICAL DETAILS 2 SPECIFICATIONS 3 PREPARATION 4 MEASUREMENT 5 NOTES ...

Page 3: ...redictive maintenance It offers digit display of vibration in terms of displacement velocity and acceleration It measures off line vibration and provides easy evaluation of health of machines On this basis further analysis can be done using vibration analyzer for diagnosing the machine problem Masibus has a proven track record of manufacturing portable instruments and online process monitoring ins...

Page 4: ... High Frequency Acceleration 1000 5000Hz 10 Battery 9V 6F22 25 hours of continuous operation Configuration Standard Inside accelerometer with 2 handheld probes Optional Outside accelerometer with magnetic mount and probe Dimensions 13 6 2 3 cm Weight 200 g 3 PREPARATION 1 Functions of the Measure key Press the key and the power is ON and the instrument is ready for measurement after releasing the ...

Page 5: ...mage of the sensor The VM 908 utilizes an external accelerometer and magnetic base to improve frequency response and provide a more repeatable vibration reading 4 Measurement 1 Select the measure parameters VM 908 has 4 vibration parameters They are a Displacement unit μm 1 1000 mm Equivalent peak peak value b Velocity unit mm s True RMS Value c Acceleration unit m s2 Equivalent peak d High Freque...

Page 6: ...etc Note that in some cases the mass of the transducer may influence the reading A good rule is to consider readings on surfaces that are lower in mass than 10 times the mass of the transducer doubtful How to interpret vibration measurements A user with no previous experience to interpret the results is recommended to use the ISO 10816 3 standard together with a good portion of common sense Be pre...

Page 7: ...other natural excitation frequency such as blade passage etc A great advantage with proper vibration measurements and the use of vibration standards is that you can judge the future maintenance cost very reliably already at first start up If you find levels above 3 mm s RMS you can be rather sure that the machine will cause increased activities in maintenance The specific cost and action is of cou...

Page 8: ...ear out cause frequent replacements Seals wear out leakage of all kinds evident Cracks in welding and concrete foundations Screws and bolts are loosening High noise level Plan action soonest Do your best to reveal the reason You are wearing down investments quickly 18 mm s Very large vibrations and high noise levels This is detrimental to the safe operation of the machine Stop operation if technic...

Page 9: ...he resonance peak while the speed of the machine is changing The resonance frequency is located at that rpm where the vibration has a local maximum The proper action against a resonance is very different depending on its location operating conditions etc It will normally require good experience to alter the situation One reason is that the modification affects the basic mechanical design of the ma...

Page 10: ...ces misalignment etc and not purely from bearing vibrations and would therefore be difficult to interpret If the selected frequency band only includes very high frequency noise and vibrations we would need special vibration transducers that are very rigidly and closely mounted to the bearing because the machine structure works as a mechanical filter for high frequencies VM 908 is measuring the bea...

Page 11: ... of course only reduce the vibration caused by unbalance A balancing round will often be a good approach and a first attempt to find the reason for increased vibration If the balancing attempt is not successful the cause can be loose rotor parts etc If the machine speed is variable be sure to choose the same speed during every trial run Do not search the speed that gives the highest vibration Such...

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