Intek RheoVac 940 User Manual
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SECTION 4 — M AINTENANCE
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 and/or
corrosive layers on the various terminal strip connections. Periodic checks with necessary cleaning
should be performed to insure clean terminals. The joints of the sensor leads should occasionally be
inspected for corrosion or presence of moisture.
The RheoVac air in-leak instrument 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 flow sensor 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 parts to stock. Should a spare be needed, a complete unit
should be ordered and stocked.
Spare fuses should be available for replacement of blown fuses. Appropriate fuses to stock are:
Slow blow 250mA Wickmann fuse, part number 3720250041 or equivalent, for the
microprocessor printed wiring board (top board);
Slow blow 160mA Wickmann fuse, part number 3740160041 or equivalent, for the flow
meter's heater on the microprocessor printed wiring board (top board);
Fast acting 2A Wickmann fuse, part number 3731200041 or equivalent, for the sensor
interface printed wiring board (bottom board.)
4.4 TROUBLE SHOOTING
Table VI provides a guide for plant personnel to identify causes of problems and determine appropriate
actions to resolve problems observed. If problems are encountered and factory assistance is desired, take
field check readings as identified in Table VII before contacting factory.