SS500e/SS2000e/SS3000e Gas Analyzer
4–4 4900002230 rev. D 2-6-20
some sample components. Sample probe regulators can be electrically or
steam heated. Some probes have the pressure reducing valve parts inserted
into the process piping, so that the Joule-Thompson cooling is offset by
warming from the flowing sample. Note that for these probes to work correctly,
the process gas must be flowing anytime the sample is flowing or liquid
condensation may collect in the sample transport line, or even freeze up the
sample probe regulator. Refer to Appendix A for the proper regulator pressure
setting.
Sample transport tubing
Sample transport tubing must be made of an appropriate material, which may
be coated, and of an appropriate diameter for the application. Many times the
sample transport tubing must be heat-traced to prevent sample condensation
or to prevent fluctuations in measurement due to changes in ambient
temperature. Refer to Appendix A for SpectraSensors’ recommended sample
transport tubing specifications.
Sample bypass flow control
A sample bypass flow control valve and flowmeters are usually provided to
maintain a flow of fresh sample to the SCS even during system shut-down. The
flow control valve is typically a needle valve and should be closed very gently
and carefully if used to shut off flow completely to avoid damaging the valve.
If the bypass flowmeter has a glass tube, perform an occasional check for
evidence of liquid in the tube. If liquid is found in the bypass or sample cell
flowmeter tubes, investigate and correct immediately.
SCS pressure regulator
All SpectraSensors’ TDL cells are limited to a maximum 10 PSIG pressure. To
ensure that this pressure is not exceeded, a pressure regulator is provided
inside the sample system. Refer to Appendix A for the correct pressure setting
for this regulator.
Sample cell flow controller
A sample cell flow controller is normally provided with the SCS. Typically a flow
control needle valve and flowmeter similar to the sample bypass are used, but
in some cases a differential flow controller is used. As with the bypass flow
control valve, if the flow control needle valve and flowmeter must be used for
sample shut-off, close the valve gently and carefully to avoid damage.
Validation systems
Validation of the analyzer performance can be accomplished by comparison to
other analyzers, portable measurement devices, or by validation using a
cylinder standard.
Refer to Appendix A for details of the validation system used in your system.
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