PN T900-013, Rev A
General Notes on Regulators and Plumbing
• Ultra High Purity (UHP) regulators and gauges are suggested for all incom-
ing gas streams.
• Carrier gas should always ow through the Reduction Gas Analyzer. Do
not use an automatic shut-o valve for the Sample/Carrier gas supply that
would stop ow in event of power failure. It is essential to always have ow
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-o valve to isolate the spare cylin-
der when not in use. This extra cylinder provides a safety margin in order
to maintain ow through the analyzer. Immediately order a new cylinder
when the spare begins to be used.
• Use Cajon VCR ttings with nickel gaskets to connect to UHP regulators.
Do not use pipe thread ttings since they are not clean and are not leak-
tight for trace gas analysis.
2-6 | ta7000R Gas Purity Monitor
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