Intek RheoVac SENTRY - Manual (Page 24)

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SECTION 4 — MAINTENANCE
4.1 GENERAL MAINTENANCE
Precautions should be taken to insure proper performance of all sensors. Since the quantification
technique involves signal measurements, care should be exercised to prevent build-up of dirt on the
probe, or corrosion on terminal strip connections in the electronics box. Periodic checks with necessary
cleaning should be performed to insure clean terminals. The probes should be regularly inspected for
corrosion or presence of moisture or dirt; the probe tips (where the sensing components are housed)
should be carefully cleaned (see
Section 2.4 PROBE INSTALLATION).
4.2 CALIBRATION
The RheoVac SENTRY System is calibrated at the factory in a calibration system which replicates the
condenser and vacuum line environment. The system is designed to calibrate the temperature, pressure,
water vapor relative saturation and mass flow under the gaseous fluid conditions found within the power
plant vacuum line.
In general, calibrations should be valid over a two to five year period. Should the unit require re-ranging
or recalibration, note the serial number of the RheoVac instrument and contact the factory concerning
recalibration cost and turn around times. Refer to
SECTION 5 — CUSTOMER SERVICE of this
manual for additional information.
4.3 SPARE PARTS
There are no normally recommended spare components to stock. However, it is desirable and usually
cost effective to order and stock a spare sensor probe. Should a probe become damaged or require
factory service, the spare probe can be readily installed in its place. (This will require installing a new
data file into the CPU.)
Spare fuses should be available for replacement of blown fuses. Appropriate fuse to stock is:
Slow blow 500mA Wickmann fuse, part number 3720500041 or equivalent, for the SENTRY probe
electronics.
4.4 TROUBLE SHOOTING
The RheoVac SENTRY error screen displays diagnostic messages to aid operators in identifying potential
causes of instrument problems and malfunctions. The following table provides a list of the fault modes
identified by the instrument and the corresponding appropriate remedial actions. The last two items in
the table do not show up in the error log, but are obvious symptoms that might be encountered.