Alpha Moisture Systems dewSMART ADSH Buku Petunjuk - Halaman 6

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Page 5
INSTALLING THE AIR/GAS SAMPLING SYSTEM
The piping installation schematic diagram on page 6 of this manual, shows all
components which could be used in a dry gas measurement application although all the
items shown will not be required for every installation.
Care should be taken to ensure that the sample presented to the measuring sensor is not
contaminated with any component that will damage, contaminate or affect the sensor in a
way that will impair the system accuracy.
It is strongly recommended that the sample should not contain particulate matter, oil or
other heavy hydrocarbon condensate.
If these components contaminate the sample
system and/or the measuring sensor the system response time will be lengthened,
although the sensor calibration will not be effected.
The sample must not contain Ammonia, Chlorine, Ozone or any wet acid vapours or
liquid as these will permanently
damage the sensor and impair calibration accuracy.
The flow rate, although not critical to the sensor measurement, should be low enough to
avoid abrasion to the sensor surface without being so low as to extend the system
response time to an unacceptable level. In general, a flow rate of between 2 and 3
litres/min at NTP will give the light balance.
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The sensor is a variable capacitor which is directly affected by changes in partial pressure
of water vapour and these changes, which are proportional to the dew/frost point
temperature, are displayed on the instrument indicator.
Partial pressure of water vapour is directly affected by total pressure and, this being the
case, the instrument will display the dew/frost point temperature at whatever total
pressure the sensor is exposed, therefore care should be taken to ensure that the sample
pressure, at the sensor is that at whkh the dew/frost point readings are required.
The measuring sensor can be installed directly into the process line but this does create
problems with access for maintenance and calibration.
It is for these reasons that we
recommend that the sensor be installed in a bypass, fast loop or total loss sample system
where the sensor is accessible without interrupting the main process flow line.
NOTE
Do not install the sensor at this time. Wait until the commissioning stage,
as described on page 9.
DOC:
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