Sample Conditioning System
Hardware Installation and Maintenance Manual 4
–3
2. If a field pressure reducing station is used with the analyzer, confirm
that the field pressure reducing station is installed properly at the
sample probe.
3. Confirm that the relief valve at the field pressure reducing station
has been set to the specified setpoint. The relief valve is located on
the pressure reducing regulator at the process sample tap.
4. Confirm that the relief valve vent line is properly installed from the
field pressure reducing station to the low pressure flare or
atmospheric connection.
5. If applicable, confirm that the sample probe and field pressure
reducing station are properly traced and insulated without any
exposed surfaces.
6. If applicable, confirm that the field run electric-traced sample
transport tubing is installed correctly (no exposed tubing or
pockets), terminated properly at each end, and that each line has
been purged clean and pressure tested.
7. Confirm that all valves are closed and all switches are off.
8. Confirm that the AC power is available to the electrically traced
sample tubing (if applicable), analyzer and SCS, but that the local
switches are off.
9. Confirm that the field analog and alarm signal wiring is
interconnected properly (refer to “Connecting the Output Signals
and Alarms” on page 3-11).
10. Confirm that the low pressure flare or atmospheric vent is properly
connected, if applicable.
Although the relief valve has been preset at the factory, the
setpoint must be confirmed prior to operation of the sample
system. To confirm the relief valve setting (refer to “Relief Valve
Setting” on page B-3).
Route a 1/4 in. tube from the relief valve vent to an atmospheric
vent or low pressure flare vent.
In certain applications, vents from the analyzer system (relief
vent/bypass vent/cell vent) may have individual 1/4 in. tubing
connections. These vents should be routed to an atmospheric vent
or low pressure flare header. In other applications, the previously
mentioned analyzer system vents are routed to a common 1/2 in.
tubing connection within the sample conditioning system. This
common vent should be routed to an atmospheric vent or low
pressure flare header.
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