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Installation
50 cc/min (0.1 scfh). For carbon dioxide or argon, set the
flowrate to 200 cc/min (0.4 scfh).
When installing pressure regulators on supply cylinders, crack the
cylinder valves so that gas is flowing during installation. This will
eliminate the most common cause of standardization-gas contamination:
air trapped during assembly diffusing back into the cylinder. This
procedure is particularly important in applications where impurity
content of 1 to 2 % is the range of interest.
3.4.3
VENT E
XHAUST
There are two separate VENT fittings—one for the sample gas
and one for the reference gas
to tubing that minimized back pressure from restricted flow.
Exhaust connections must be consistent with the hazard level of
the constituent gases. Check local, state, and federal laws, and ensure
that the exhaust stream vents to an appropriately controlled area if
required. If not vented to the same area, both VENT lines must vent to
areas with equal ambient pressures, and pressures must vary no more
than the normal barometric changes.
Install VENT lines such that water and dirt cannot accumulate in
them.
3.4.4
SAMPLE G
AS
In the standard model, sample and calibration gases are
introduced through the
Sample inlet with appropriate valves.
The gas pressure in should be well regulated. The sample line
pressure regulator should be installed as close to the sample line as
possible to minimize sample line lag time. If greater flow is required for
improved response time, install a bypass in the sampling system
upstream of the analyzer input.
3.4.5
REFERENCE G
A gas of fixed composition is needed as a reference to which the
sample gas will be compared. The reference gas is normally selected to
represent the main background gas of the analysis.
For most applications, a constant supply of reference gas flowing at
the same rate as the sample is required for best results. However, in
Teledyne Analytical Instruments
.
Connect both sample and reference vents
fitting. The gases must be teed into the
SAMPLE
AS
2000RS
16
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