Alpha Moisture Systems DS1200 User Manual page 10

Model DS1200-AMT-Ex
6 Installing the Model AMT-Ex in an air/gas sampling system
The piping installa
could be used in a dry gas measurement applica
required for every installa
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 par
or other heavy hydrocarbon condensate. If these components contaminate the sample
system and/or the measuring sensor, the system response
although the sensor calibra
The sample must not contain ammonia, chlorine, ozone or any wet acid vapours or
liquids as these will permanently damage the sensor and impair calibra
The flow rate, although not cri
to avoid abrasion to the sensor surface without being so low as to extend the system
response me to an unacceptable level. In general, a flow rate of between 2 and 3
litres/min at NTP will give the right balance.
The sensor is a variable capacitor, which is directly affected by changes in par
pressure of water vapour . These changes that are propor
point temperature are displayed on the instrument indicator .
The measuring sensor can be installed directly into the process line, but this does create
problems with access for maintenance and calibra
recommend that the sensor be installed in a bypass, fast loop or total loss sample system
where the sensor is accessible without interrup
8
on schema c diagram (see page 9) shows all components that
on.
on will not be effected.
cal to the sensor measurement, should be low enough
on. Not all the items shown will be
culate ma
me will be lengthened,
onal to the dew/frost
on. It is for these reasons that we
ng the main process flow line.
er, oil
on accuracy.
al
2148 - Iss 6 - 10/23