SS2100 H
2
S TDLAS Gas Analyzer BA02191C
4-2 Endress+Hauser
The membrane separator is a three-port device. When gas enters the separator
inlet, only the vapors will pass through the membrane to the outlet. The outlet
flow passes through a flow control valve and a flow meter to the analyzer.
Blocked liquids or particles can be flushed from the separator housing out the
bypass port.
If the correct probe and regulator is used at the sample extraction point, and
the sample transport line is heated to prevent condensation, no liquids or
particles should reach the SCS. Under normal conditions, the membrane
separator will remove very little liquid, if any. The main purpose of the
separator will be to protect the analyzer in the case of an upset condition.
Besides filtering the incoming gas, the SCS is also responsible for controlling
flow and pressure to the analyzer. An instrument grade pressure regulator is
used to set the final pressure of the gas before it enters the analyzer. There is
one flow meter for the flow path to the analyzer and one flow meter for the flow
path of the bypass. The flow meters have a built-in flow controller to set flow
rates to the recommended values (see Table A–1 on page A–1 for proper flow
and pressure settings).
Typically the SCS is assembled inside a stainless steel enclosure which is
insulated and heated using a temperature controller. This ensures that the
sample remains in a stable vapor phase and improves the measurement
performance.
In some cases other types of components are included in the SCS, such as
coalescing filters, liquid knock-outs, pumps, heaters, and other components
that are application dependent. Refer to Figure A–1 on page A–3 for a general
overview of the system configuration.
Checking the SCS Installation
The integral SCS is factory set with the appropriate pressures, flow rates, and
enclosure temperature, as indicated in the drawings found in Appendix A.
However, before operating the system for the first time, a careful check of the
installation of the entire SCS from the sample probe to the flare/vent is
recommended.
To perform SCS installation checks
1. If a sample probe is used with the analyzer, confirm that the sample
probe is correctly installed at the process supply tap and that the
sample probe isolation valve is closed.
2. If a field pressure reducing station is used with the analyzer, confirm
that the field pressure reducing station is installed properly at the
sample probe.
An optional sample probe and/or field pressure reducing station
may be provided by Endress+Hauser or through a third party.
This is not included in a standard configuration.
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