6. Service/inspection
recommendations
The following is a description of maintenance and inspection procedures applicable to this
unit.
In order to maintain system performance and stability, check the probe gap voltage at least
once a year. Refer to “5.4 probe gap voltage confirmation” for relevant guidance.
6.1 Periodic inspection
Even if no problem is apparent, we recommend that the product be replaced every 10 years.
6.2 Unit life
NOTE
The deterioration of this unit depends on the operating environment, therefore in order
to ensure system performance, 10 years should be considered a guideline, with earlier
replacement desirable. In the flowchart below, a system calibration check (output voltage
against static gap, at incremental positions across the working range) provides the base-
line data on which to judge the correctness of the measurement system.
Deviation from a straight line (DSL/Linearity) and Incremental Scale factor (ISF/SCF
error) are key measures. For graphs of the standard/nominal characteristic refer to
Appendix B1.
Calibration (Determine system static characteristic)
The margin for error satisfies the
requirements.
(Thrust, Rotation → DSL error)
(Vibration, Eccentricity → ISF error)
No
Yes
Yes
Can the measured output character-
istic be adequately compensated for
by appropriate changes in the offset/
sensitivity setting at the monitor?
Replacement is recommended
No
Can continue to be used
Can continue to be used
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Summary of Contents for CMSS 785 Series
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