Ametek 241CE II Operator's Manual page 59

If your system will be operating at these low pressures, AMETEK
recommends installing an additional coalescing filter or knock-out pot
with an isolation valve or Flow Restrictor (typically supplied by the
customer/end user) upstream of the analyzer to provide a constant
drain. Install this filter on the Sample Line between the Sample Probe
and the analyzer. Alternatively, a probe – such as a Genie – with an
integral filter can be used.
Connect the other end of the tubing to the Sample Probe.

The inlet sample flow rate typically will be 1.0–5.0 Nl/min (2.1–10.6
SCFH) during the Purging/Hold Stage, and 0.3–3.3 Nl/min (0.7–7.0
NOTE
SCFH) during the remainder of the cycle. The flow rate during the
Purging/Hold Stage must be sufficient to purge the sample system
within the allotted purging time.
3. Using 1/4" 316 stainless steel tubing, run the Vent Line tubing from the
analyzer to the disposal location. The method of disposing of the used
sample gas can be venting it to atmosphere or to low pressure (<50
PSIG) flare header.
4. Before connecting the Vent Line tubing to the analyzer, temporar-
ily install a flow metering device (e.g., a rotameter, supplied by the
customer/end user) on the Vent Line between the Filterblock Assem-
bly and the disposal system. This will allow you to, in conjunction
with the pressure regulator, set the desired gas flow. The rotameter
will only be used to set the flow rate and must be removed before the
analyzer is operated under normal conditions.
Use the pressure regulator and the rotameter to adjust the sample gas
flow rate that will be used during the Purge Stage (1.0–5.0 Nl/min, or
2.1–10.6 SCFH). The pressure regulator minutely adjusts the pressure,
but its main purpose is to adjust the flow rate. The rotameter can be
a permanent installation if it is rated and approved for the pressure it
will be exposed to if the Vent Line is closed off. (Example, if the Vent
Line is closed, the rotameter must be able to withstand the pressure
of the process line.) If the rotameter being used cannot withstand the
process gas line pressure, it must be a temporary installation only; the
rotameter must be removed before running the analyzer under nor-
mal operating conditions.
Installation and Start-Up
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