Ametek 241CE II User Manual page 39

3. Using
4. Before connecting the Vent Line tubing to the analyzer, temporarily install
PN 903-8797, Rev A
If your system will be operating at these low pressures, AMETEK recom-
mends 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. Alterna-
tively, 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/minute (2.1–10.6
SCFH) during the Purging/Hold Stage, and 0.3–3.3 Nl/minute (0.7–7.0
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.
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.
a flow metering device (e.g., a rotameter, supplied by the customer/end
user) on the Vent Line between the Filterblock Assembly 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/minute, 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 per-
manent 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 normal operating conditions.
Installation and Start-Up
|
2-15