SKF CMSS 785 Series, User Manual

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4.1 System installation requirements
Major considerations include temperatures, pressures and mechanical stress to which the
probe, driver and cables are subjected. It is essential that the probe be rigidly mounted, yet
easily adjusted (SKF mounting accessories are ideal for this).
The target material, target surface finish, flatness and size can all affect the output character-
istic. It is expected that the target area will have been prepared so as to minimize both
mechanical and electrical run-out, that may otherwise cause a false vibration indication.
In Appendix B, the effect that the precise nature of the target, operating environment etc. can
have on the system output characteristic is quantified by way of examples B1 through B9.
Further guidance on the installation requirements for probes is given in 4.1.2 and 4.1.3.
4.1.1 General
4.1.2 Probes used for speed/phase detection
Special recommendations are made for target sizing where the probe is to be used for speed
or phase detection. Three scenarios are shown:
1 Multi-tooth or multi target wheel (speed only)
2 Raised, single target for speed and/or phase detection
3 Single slot target for speed and/or phase detection
D
D
C
B
A A
C
D B
C
Dimension of target (recommended for rotational speed measurement) Set gap (recommended)
mm mm
A ≥ 6 1,0 to 1,5
B ≥ 7
C ≥ 2,5
D ≥ 16
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