Manfred Weber
Metra Mess- und Frequenztechnik in Radebeul e.K.
Since 1954

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Accelerometer Selection

In order to achieve optimum measurement conditions the following questions should be answered:

  • Can you make at the selected location unadulterated measurements of the vibration and derive the needed information?

  • Does the selected location provide a short and rigid path to the vibration source?

  • Is it allowable (considering warranty restrictions) and possible in technical respects to prepare a flat, smooth, and clean surface with mounting thread for the accelerometer?

  • Can the accelerometer be mounted without altering the vibration characteristics of the test object?

  • Which environmental influences (heat, humidity, EMI, bending etc.) may occur?

The following table shows a summary of the most important criteria for selecting an accelerometer:

Criteria
Accelerometer Properties
Amplitude Range

Choose appropriate sensitivity and maximum acceleration.

Use high sensitivity accelerometers for lowest vibration.

Selection chart for acceleration:

<10 g
10 - 200 g 200 - 1000 g 1000 - 10000 g
KB12(VD)
KS48C
KS76C100
KS77C100
KS78.100
KS901.100
KS813B
KS74C100
KS80D
KS81B
KS94B100
KS95B100
KS943B100
KS823B
KS76C10
KS77C10
KS78.10
KS901.10
KD41
KD42
KS91B
KS94B10
KS95B10
KS74C10
KS943B10
KS93
KD37
KD38
KS56
KS57
KS90

Frequency Range

Choose resonant frequency and linear frequency range

Selection chart for upper 3 dB frequency limit:

<200 Hz
0.2 - 10 kHz
10 - 15 kHz
15 - 25 kHz
>25 kHz
KB12(VD) KS48C
KS81B
KS813B
KS823B
KD37
KD38
KD41
KD42
KS80D
KS76C100
KS77C100
KS78.10/100
KS901.10/100
KS90
KS93
KS943B10
KS943B100
KS74C10
KS74C100
KS56
KS57
KS91B
KS94B10
KS94B100
KS95B10
KS95B100
KS76C10
KS77C10
Weight of Test Object

Accelerometer weight <1/10 the weight of test object.

Test method for accelerometer weight to ISO 2954:

"Double de co-vibrating mass of the sensor by an additional mass. If the new indication shows a deviation from the original reading of more than 12%, the mass of the accelerometer is too great."


Choose miniature accelerometers for light objects.

Selection chart for sensor weight:

<3 g
3 - 20 g
20 - 50 g
50 - 100 g
>100 g
KS91B
KS94B10
KS94B100
KS95B10
KS95B100
KS90
KS943B10
KS943B100
KS78.10/100
KS901.10/100
KS76C10
KS76C100
KS77C10
KS77C100
KD37
KD38
KS74C10
KS74C100
KS56
KS57
KD41
KD42
KS80D
KB12(VD)
KS48C
KS81B
KS813B
KS823B
High temperature
Models KS56 and KS57 for up to 250 °C
Temperature Transients, Base Strain, Magnetic Fields, Extreme Acoustic Noise
Assess influence, choose sensor according to characteristics,
choose shear type accelerometers when temperature transients or base strain may occur, stainless steel versions for strong magnetic fields
Humidity and Dust
Industrial accelerometers with protection grade IP67
Measurement of Vibration Velocity and Displacement
Single and double integration, below 20 Hz use shear type accelerometers
Mounting
Quick measurement below 1 kHz with low accuracy Use accelerometer probe
For temporary measurement without altering the test object
Use magnetic clamp, wax or adhesives
Long-term measurement
Use stud mounting or insulating flange
Grounding problems, potential differences
Use insulating flange or insulated accelerometers
Long distance between sensor and instrument
Use IEPE accelerometers
Measurement in two or three axes
Use triaxial accelerometers or triaxial mounting cubes
Sensor telemetry and battery-powered equipment
Use charge accelerometers or Low Power IEPE accelerometers

Proceed to chapter Accelerometer Mounting