Agilent Technologies HP 5890 II Plus Series, Manual

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Site Preparation
Assembling the gas plumbing
13
Assembling the gas plumbing
Two-Stage Regula-
tor
Main Supply
On/Off Valve
Main Gas
Supply
On/Off
Valve
Moisture Trap
Oxygen
Trap
HP 5890
SERIES ll
General Plumbing Diagram
Follow this general plumbing diagram to prepare gas supply plumbing.
Note that:
C
Two•stage(rather than single stage) regulators are strongly
recommended to eliminate pressure surges.
C
On/off valves are not essential but are very useful. They are usually
mounted on the outlet fitting of the two•stageregulators.
C
FID and NPD detectors should have their own air supply. Detector
operation may be affected by pressure pulses in air lines shared with
other devices (valve actuators, samplers).
C
Flow•and pressure•controllingdevices require at least 138 kPa (20
psi) pressure differential across them to operate properly. Source
pressures and capacities must be more than ample to ensure this.
C
If auxiliary flow panel(s) are not to be installed in the instrument, we
recommend pressure gauges in gas supply lines just prior to their
connection to instrument inlet fittings. This measures supply
pressure at the instrument rather than pressure at the source (which
may be different due to long or narrow supply lines).