Alpha Moisture Systems DS5000 Manuel d'instruction - Page 8
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4.2 Piping Schematic 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) Sample Pressure Gauge – This is not a critical part of the moisture measurement but may
be required if Dew/Frost point measurements are to be made at higher than atmospheric
pressure.
6) Measuring Sensor.
7) Sensor Holder.
8) Desiccant Chamber – This item is required when the sampling is to be intermittent. When
installed it prevents the ingress of wet air to the sample system, while the sample is not
flowing, improving the response time.
9) Flow Control Valve – This can be a separate item or combined with the flow indicator.
10) Flow Indicator – The recommended sample flow is 2 to 3 SL/M.
11) Sample Exhaust – The exhaust can be vented to atmosphere or returned to the process line
as discussed above.
5 Installing and Commissioning the DT45 Sensor
It is advisable to carry out an initial purge routine of the sample loop, before installing the
sensor, in order to remove the possibility of sensor damage on start-up.
Refer to the sample system schematic in section 4.1. Open the inlet isolation valve slowly,
until a small flow of air/gas at atmospheric pressure flows through the inlet pipe work to the
sensor holder and exhausts through the sensor entry port of the sensor holder.
1188 Instruction Man DS5000.doc
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