Endress+Hauser SS1000, Hardware Installation And Maintenance Manual

Page: 64 / 121

2-Pack Analyzer System
4
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10 4900002256 rev. B 4-13-21
1. Isolate the analyzer from the bypass following the procedure under
“To isolate the measurement cell for short-term shutdown”
on page 4-8.
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.
The process sample at the sample tap may be at a high pressure.
A pressure reducing regulator is located at the sample tap to
reduce the sample pressure and allow operation of the SCS at a
low pressure. Use extreme caution when operating the sample
probe isolation valve and field pressure reducing regulator.
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.
All valves, regulators, switches, etc. should be operated in
accordance with site lock-out/tag-out procedures.