Intek RheoVac 950 - Manual (Page 20)

- 18 -
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 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.
4.2 CALIBRATION
The RheoVac instrument is calibrated at the factory in a calibration system which replicates the
condenser and vacuum line environment. The system is designed to simulate the temperature, pressure,
water vapor relative saturation and flow rate under the gaseous fluid conditions found within the power
plant vacuum line.
In general, calibrations should be valid over a two year period if the probe is well maintained. 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
It is advantageous to have a spare probe. Should a spare probe be desired, it can be ordered and stored
for installation at any time. A spare probe will come with a parameter disk for uploading from a laptop.
Spare fuses should be available for replacement of blown fuses. Appropriate fuses to stock are:
500 mA fuse, slow blow, Wickmann part number 3720500041 or equivalent, for probes.
1 A fuse, slow blow, Wickmann part number 372110041 or equivalent, for the main electronics.
There are no other normally recommended spare components to stock.
To replace the fuse in the main electronics: locate the AC Power Input board (shown in Figure 5) in the
lower right hand corner of the main electronics box. Slide the power switch to the “OFF” position to
disable power to the electronics. The fuses are shown at locations F1 and F2 (spare). Gently pull the
fuse(s) from their sockets and gently insert the replacement 1 Amp fuse(s) as appropriate. Slide the
power switch back to the “ON” position to enable power to the electronics. Close hinged lid and verify
display backlight is on. Clamp close the enclosure lid, and tighten the latch screws.
4.4 TROUBLESHOOTING
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,
please contact the factory.