Sample Conditioning System
SCS Overview Manual 3
–13
11. Turn off the AC power to the SCS heater and the sample tracer, if
applicable, at the power distribution panel.
Powering Down the Analyzer
It may be necessary to power down the analyzer for problem solving or
maintenance reasons. An approved switch or circuit breaker rated for 15 amps
should have been installed and clearly marked as the disconnecting device for
the analyzer.
Topowerdowntheanalyzer
1. Switch off the power to the analyzer using the switch or circuit
breaker designated as the disconnection device for the equipment.
2. If the analyzer is going to be shut down for a short period of time for
routine maintenance, isolate the analyzer from the SCS.
3. If the analyzer is going to be shut down for a long period of time,
follow the procedure for isolating the process sample tap for long-
term shutdown or contact Service, refer to “Service Contact” on
page B-5. It is recommended to also disconnect the power
completely from the analyzer to prevent potential damage from
lightning strikes.
Topurgetheanalyzerforshipment/relocation
1. Refer to the procedure “To isolate the process sample tap for
long-term shutdown” on page 3-12.
2. Disconnect the sample tubing at the inlet to the analyzer.
3. Connect clean, dry nitrogen to the sample inlet. Set to 30 PSIG.
4. Open the low pressure flare or atmospheric vent header shut-off
valve for the effluent from the sample bypass.
5. Allow the analyzer to purge for 20 minutes.
6. Shut off the nitrogen purge and disconnect.
7. Close the low pressure flare or atmospheric vent header shut-off
valve for the effluent from the sample bypass.
8. Cap off all connections.
Although power could be shut off to the sample transport line
electric tracer, it is advisable to allow this line to remain heated
unless the SCS is to be out of service for an extended period or
maintenance is required on the line.
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