Emerson CSI 9420 Reference Manual page 99

While PeakVue is very useful for providing an early indication of impact-related faults in
rolling-element bearings, there are many general applications where a lower-frequency
measurement is more appropriate. Also, virtually all vibration analysts are very familiar
with the Overall Velocity measurement and use it as part of their existing vibration
programs. While it may not be possible to obtain a measurement result comparable to the
PeakVue value reported by the CSI 9420 with a non-CSI handheld vibration analyzer, the
Overall Velocity measurement is common throughout the industry and should be easy to
correlate with results from handheld instruments.
There are, however, a number of different methods for measuring and reporting Overall
Velocity, so ensure that the measurement conditions are similar when trying to duplicate
the value reported by the CSI 9420 with a handheld. The CSI 9420 uses ISO 10816, which
defines a measurement bandwidth of 2 Hz to 1 kHz. The ISO 10816 general fault levels at
various turning speeds are shown in
Figure 5-3:
Depending on the type of machine being monitored, the values shown in this graph should
be multiplied by the service factors given in
Table 5-1:
Machinery type
Single-stage Centrifugal Pump, Electric Motors, Fans
Non-critical Chemical Processing Equipment
MHM-97408, Rev 15
Figure
General fault levels
Service factor multiplier
Velocity, PeakVue, and temperature
5-3.
Table 5-1.
Service factor
1.0
1.0
93