Endress+Hauser SpectraSensors SS500 - To Isolate the Analyzer for Long-Term Shutdown (Full-Featured Sample System)

SS500/SS2000 Analyzer
4–10 4900002285 rev. B 3-25-20
1. Close the sample supply shut-off valve.
2. Allow the sample to flow until all residual gas has dissipated from the
lines as indicated by no flow on the sample and sample bypass flow
meters.
3. If applicable, close the atmospheric vent header shut-off valve for
the combined sample bypass and measurement cell effluent from
the SCS.
4. Turn off power to the analyzer.
Toisolatetheanalyzerforlong‐termshutdown(full‐featured
samplesystem)
If the SS500/SS2000 analyzer with full-featured sample system is to be out of
service for an extended period, the analyzer must be isolated at the process
sample tap.
All valves, regulators, switches, etc. should be operated in
accordance with site lock-out/tag-out procedures.
If the system will not be out of service for an extended period, it
is advised that power remain applied to the sample transport line
heat trace, if applicable.
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 long-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.