General Notes On Regulators And Plumbing - Ametek ta7000R User Manual

General Notes on Regulators and Plumbing

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2-6 | ta7000R Gas Purity Monitor
Ultra High Purity (UHP) regulators and gauges are suggested for all incom-
ing gas streams.
Carrier gas should always flow through the Reduction Gas Analyzer. Do
not use an automatic shut-off valve for the Sample/Carrier gas supply that
would stop flow in event of power failure. It is essential to always have flow
through the RGD to prevent mercury build-up in the photometer cell and
on the Measuring Cell windows. Mercury build-up will decrease sensitivity
of the detector. We recommend installing a spare Carrier gas cylinder into
the Carrier gas supply line for the RGD. The spare cylinder can be plumbed
in through a tee in the line. Use a shut-off valve to isolate the spare cylin-
der when not in use. This extra cylinder provides a safety margin in order
to maintain flow through the analyzer. Immediately order a new cylinder
when the spare begins to be used.
Use Cajon VCR fittings with nickel gaskets to connect to UHP regulators.
Do not use pipe thread fittings since they are not clean and are not leak-
tight for trace gas analysis.
PN T900-013, Rev A