SS2100 H
2
S TDLAS Gas Analyzer BA02191C
4-10 Endress+Hauser
1. Isolate the analyzer from the bypass following the procedure under
“To isolate the measurement cell for short-term shutdown”
on page 4-7.
2. Confirm flow in the sample bypass flow meter (the actual flow is not
critical).
3. Close the sample probe process shut-off valve at the sample supply
process tap.
4. Allow pressure in the field pressure reducing regulator to dissipate
until only a low residual pressure is indicated on the pressure gauge
at the field station.
5. Close the field pressure reducing regulator (adjustment knob turned
fully counterclockwise).
6. If applicable, close the low pressure flare or atmospheric vent
header shut-off valve for the relief valve vent from the field pressure
regulator.
7. Close the sample supply shut-off valve to the SCS.
8. Leave the sample bypass flow meter metering valve open.
9. Close the low pressure flare or atmospheric vent header shut-off
valve for the effluent from the sample bypass.
10. Turn off power to the analyzer.
11. Turn off the AC power to the SCS heater and the sample tracer, if
applicable, at the power distribution panel.
To purge the analyzer for shipment/relocation
1. Complete the procedure “To isolate the process sample tap for
long-term shutdown” on page 4-9.
2. Turn off the power to the analyzer and sample system.
3. Disconnect the sample tubing at the inlet to the analyzer.
The sample transport line must be vented to the low pressure
flare or 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.
Although power could be shut off to the sample supply 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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