Alpha Moisture Systems DS1200 User Manual page 12

Model DS1200-AMT-Ex
6.2 Piping schema
4) Pressure Reduc
at atmospheric pressure then the valve 4A should be fi
the system. If the sample is to be measured at full line pressure and the exhaust
vented to atmosphere, then valve 4B should be fi
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 cri
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 intermi
When installed, it prevents the ingress of wet air to the sample system while the
sample is not flowing, improving the response
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 litres/min at NTP .
11) Sample Exhaust – The exhaust can be vented to atmosphere or returned to the
process line as discussed above.
7 Installing and Commissioning the Model AMT-Ex
It is advisable to carry out an ini
the transmi er, in order to remove the possibility of sensor damage on start-up.
Refer to the sample system schema
un l a small flow of air/gas at atmospheric pressure flows through the inlet pipe work
to the transmi
ter holder .
Allow this purge to con
ture from the sample pipe work and components.
Close the inlet isola
Locate and secure the four-pin transmi
transmi er . Use the locking screw in order to affect a weatherproof seal.
NOTE: - The Plug and socket will only locate in one posi
is different to the other three pins.
10
c component index con
on Valve or Pressure Regulator – If the sample is to be measured
al purge rou
er holder and exhausts through the sensor entry port of the transmit-
nue for about 15 to 20 minutes to remove any residual mois-
on valve and install the transmi
nued.
ed and 4A omi
cal part of the moisture measurement
me.
ne of the sample loop, before installing
c on page 9. Open the inlet isola
er into the transmi
er cable connector in posi
ed and 4B omi ed from
ed from the
on valve slowly,
er holder .
oned on the
on, as the GND (ground) pin
ent.
2148 - Iss 6 - 10/23