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VIM6* Vibration Sensors
Product Description
2.2
Vibration Monitoring
2.2.1
Vibration Velocity Operating Range
The operating range of the vibration velocity is not constant over the entire measuring range. It
always depends on the current frequency at which the vibration sensor is vibrating.
Essentially, the higher the current frequency, the lower the detectable vibration velocity. This
can lead to a significantly high frequency, which can then lead to the current operating range of
the sensor in this state being smaller than the specified measuring range.
The maximum detectable operating range can be derived from the maximum detectable accel-
eration. This is 16.5 g (161.8 m/s
The maximum measurable vibration velocity results from the following physical correlation:
The f ollo wing applies to sinusoidal
vibr ations:
The following figure depicting the vibration monitoring shows the operating range, which is lim-
ited by the maximum measurable vibration velocity in mm/s depending on the frequency. The
area above the curve shows the operating range that cannot be measured when recording the
vibration velocity, because the frequency is too high. The sensor outputs the vibration velocity
value that can only just be detected.
Example for a version with a measuring range of 128 mm/s:
•
Assumption: Application vibrates at 80 mm/s at 400 Hz
•
Sensor output: 64 mm/s
This is the vibration velocity value that can only just be detected at this frequency.
Figure 2.1
1
Frequency in Hz
2
Vibration velocity in mm/s
3
Operating range of vibration monitoring
8
2
) for the entire frequency range.
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