Alpha Moisture Systems DS1200-AMT Panduan Instalasi, Komisioning, dan Pengoperasian - Halaman 8
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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.
6.1
Piping Installation
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3
1
Process
Notes
a.
b.
6.2
Component Index
1)
Sample Isolation Valve - This is a recommended item as it allows access to the sample system without interrupting the main
process line.
2)
Sample Tube – This should be stainless steel for dry air or gas applications but copper or carbon steel can be used where
wetter gases are to be measured. If any section of the sample tube must be flexible then PTFE should be used. In most
cases, 3mm OD (1/8") is sufficient as it provides good system response time within minimum flow. 6mm OD (1/4") tube
can be used where pressure drops across the 3mm tube are too high
3)
Filter Unit – A filter unit is recommended when the samples are likely to contain particulate matter. If the air/gas sample
contains heavy hydrocarbon condensate, the filter must be of the coalescing type with a drain. The filter unit should be
positioned as close to the sample point as practical.
4)
Pressure Reduction Valve or Pressure Regulator – If the sample is to be measured at atmospheric pressure then the valve
4A should be fitted and 4B omitted from the system. If the sample is to be measured, at full line pressure and the exhaust
vented to atmosphere, then valve 4B should be fitted and 4A omitted from the system. If measurements are to be taken at
full line pressure and the sample is to be returned to a part of the main line or a vent, which is at a pressure higher than
atmospheric, and the input to that line needs a controlled pressure then both 4A and 4B will be required.
5
4A
P
Main
Line
The sample point should be on the upper surface of the horizontal pipe, or from a
vertical section of pipe, wherever possible.
The sample tube should run upwards from the sample point. If this is not possible,
then an inspection port or drain tap should be installed at the lowest point in the
sample system.
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6
10
8
4B
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