Intek RheoVac 950A - Manual (Page 24)

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4.3.3 Primary Signal Validation
If the RheoVac instrument is operating without message indications but output readings are
questionable, check your RheoVac instruments primary readings per Table 9. Please send to
Intek by e-mail the following plant data: turbine back pressure, hotwell temperature, load, and
inlet and outlet circulating water temperatures, along with at least 24 hours of data from the
RheoVac instrument/probe for the same time period. A support engineer can examine the data
and respond to the inquiry.
Table 9 Verify Primary RheoVac Readings
Pressure, P
RV
: Probe pressure should be 0.1” to 0.5”HgA lower than condenser pressure
P
RV
< P
Cond
(0.1 to 0.5”HgA typical, 1” HgA under high AIL)
Temperature, T
RV
: Probe temperature may be as high as hotwell temperature or as low as circ
water inlet temperature; typically a few degrees below circ water outlet
temperature and hotwell temperature
T
cw,in
T
RV
T
HW
T
cw,out
± 4(F T
RV
T
HW
Total Mass Flow, m
T
m
T
1,000 lb/hr (for large exhauster)
225 lbs/hr (m)
T
600 lbs/hr (per exhauster, typical)
if m
T
> 1,000 lb/hr, check RheoVac internal T; > 20(F
Relative Saturation, RS RS < 100% and varying; typically 80 to 97%
4.4 HARDWARE/SOFTWARE MODIFICATIONS AND UPDATES
4.4.1 Updating Software
Normally, updating the main software residing on the RheoVac Model 950 is done at the factory.
However, software improvements or other factors may necessitate a user installation or update of
a new main program. When this is required, instructions will be supplied, along with the
software.
4.4.2 Replacing Probes
If it is necessary to replace one of the probes, a new probe and diskette or CD (with probe-
specific calibration data) can be ordered from Intek.
4.4.3 Adding Additional Probes
Each RheoVac Model 950 system can communicate with up to three probes simultaneously.
Additional probes can be easily added to systems that have fewer than three probes. Each
additional probe will be shipped with a set of calibration files that must be installed on the main
RheoVac instrument electronics. Refer to drawings for mechanical and electrical connections.
Specific instructions will be supplied with the probe(s).