Sample Conditioning System (SCS)
Hardware Installation and Maintenance Manual 4
–9
Shutting Down the SCS
The procedures discussed in this section apply to both the full-featured and
simplified sample systems.
Toisolatetheanalyzerforshort‐termshutdown(full‐featured
samplesystem)
The SS500/SS2000 full-featured analyzer can be isolated from the process
sample tap for short-term shutdown or maintenance of the analyzer without
requiring the shutdown of the field pressure reducing station.
Process samples may contain hazardous material in potentially
flammable and/or toxic concentrations. Personnel should have a
thorough knowledge and understanding of the physical properties
and safety precautions for the sample contents before operating
the SCS.
The process sample at the sample tap is at a high pressure. A
pressure reducing regulator is located at the sample tap to reduce
the sample pressure and enable operation of the SCS at a low
pressure. Use extreme caution when operating the sample probe
isolation valve and field pressure reducing regulator.
Process samples may contain hazardous material in potentially
flammable and/or toxic concentrations. Personnel should have a
thorough knowledge and understanding of the physical properties
and safety precautions for the sample contents before operating
the SCS.
Due to the high pressure of the process sample, it is advisable to
allow the sample bypass flow to continue during short-term
isolation of the analyzer. Continuing sample bypass flow allows
the field pressure regulator to continue normal operation without
possible overpressure and activation of the relief valve in the
event the pressure regulator leaks when the downstream flow is
discontinued.
The sample transport line must be vented to the atmospheric vent
header through the bypass flow meter to avoid pressure surges.
The procedure given in the following steps can be followed
regardless of whether or not the SCS has been isolated from the
process tap as described in the previous section.
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