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Trace Oxygen Analyzer
the pressure). For operation at pressures below atmospheric pressure a
suffix C (clamped) cell is required.
RESTRICTION DEVICES:
For proper operation, all 3000 series analyzers require a flow
restriction device. This device is typically a restrictor or a valve. This
restriction device serves two functions in the sample path. The first
function is to limit the flow rate of the sample through the analyzer. A
restrictor is chosen to operate over a range of pressures and provide a
useable flow rate over that range.
The second function that the restriction device provides is a
pressure drop. This device is selected to provide the only significant
pressure drop in the sample path.
RESTRICTOR KIT
The current revision of the 3000 series analyzers are supplied with
a kit containing two restrictors and a union which are user installed.
These parts supplied to give the end user more flexibility when installing
the analyzer. The restrictor kit is suitable for high and low positive
pressure applications as well as vacuum service (atmospheric pressure
sample) applications (see manual for installation instructions).
The standard restrictor (BLUE DOT) is recommended for pressures
between 5 psig and 50 psig. For positive low pressure application (5 psig
or less) the un-marked restrictor is better suited . For non-pressurized
sample applications the marked restrictor should be used and configured
for vacuum service.
For extremely low positive pressure applications (less than 2 psig)
the vacuum service configuration should provide higher performance
(higher flow rates). For vacuum service the end user must supply a
vacuum pump and a bypass valve for the pump. A vacuum level of 5 -
10 inches of mercury should provide the optimum flow rate.
CAUTION:
FLOW RESTRICTORS HAVE VERY SMALL ORIFICES
AND MAY BE PLUGGED BY SMALL PARTICLES
(.005" DIA OR LARGER) A SAMPLE FILTER MUST
BE INCLUDED IN THE SAMPLE LINE PRIOR TO THE
RESTRICTOR! A 60 MICRON FILTER IS
RECOMMENDED.
Teledyne Analytical Instruments
Appendix
81
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