INSTRUCTION MANUAL
Sahara Moisture Transmitter
Reference 085
Rev 2
Page 10 of 14
06/06/2013
VII. Helpful Information (continued)
4. Often, it’s necessary to measure at a point that requires a sample stream
purging to atmosphere. This measurement is fraught with difficulties.
a. Equilibration is next to impossible.
b. Diffusion of atmospheric water vapor is always present. Since the system
is “open ended” to atmosphere, the amount of water vapor “back flow”
(against the outflowing sample stream) is influenced by ambient changes
from night to day, season to season, and even hour to hour.
c. Even if a “pigtail” discharge system is fashioned, with a throttle valve at
the end, the diffusion is only minimized. Results are influenced so much
by ambient conditions that the precise measurement of low (less than
-75
F) moisture levels may be unachievable and even unrepeatable with
an “open ended” system.
5. Any cross checking between two or more similar instruments should be done
at identical times and conditions. This is even more important when dissimilar
instruments are checked, one against another. It’s not possible to use some
makes of moisture meters under flowing conditions (in situ) on stream or at
line pressures. Some are unstable or are effected by temperature changes or
other variables.
6. Certain contaminants can cause false readings, at best, desensitize the probe.
The system will have to dry out before data can be taken again.
7. Cleanliness is essential. Sampling techniques and set-up procedures should
be standardized. Manufacturer’s specs on sampling and measuring techniques
should be followed to the letter.
8. Spare probes should be bought. This will allow checking one against another
and will avoid having the meter out of service when the probes are in the lab
for recalibration.
9. Everyone involved should be as knowledgeable as possible on the difficulties
of moisture measurement, the use of equipment, and the meaning of data.
10. Define problems carefully. The right approach to equipment selection and
measurement techniques will instill confidence in the end results.
Summary of Contents for Sahara-Pak HC-1260
Page 40: ...INSTRUCTION MANUAL Model HC Reference 219 Rev 2 Page 40 of 46 06 20 2013 SECTION 4 WARRANTY...
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Page 87: ...INSTRUCTION MANUAL Model HC Reference 219 Rev 2 Page 45 of 46 06 20 2013 SECTION 7 CUT SHEETS...
Page 128: ...INSTRUCTION MANUAL Model HC Reference 219 Rev 2 Page 46 of 46 06 20 2013 SECTION 8 DRAWINGS...
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