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Chapter 1
Laboratory Preparation
Helium
For carrier gas: 99.995%
oxygen, and total hydrocarbons after purification. One full-size tank that has an
outlet pressure of 400–700 kPa (60–100 psi). Use a regulator with a CGA 580
connection or equivalent. Use water, oxygen, and hydrocarbon traps.
Hydrogen
For carrier or detector fuel gas: 99.995%
total hydrocarbons after purification. One full-size tank that has an outlet pressure
of 400–700 kPa (60–100 psi). Use a regulator with a CGA 350 connection or
equivalent. Use water, oxygen and hydrocarbon traps.
Air
For detector fuel gas: 99.995%
connection or equivalent. Air compressors are not acceptable because they do not
meet pressure, water, and hydrocarbon requirements.
Nitrogen
For carrier or make-up gas: 99.995% high purity, with less than 1.0 ppm of total
hydrocarbons after purification. Use a regulator with a CGA 0580 connection or
equivalent.
Argon
For carrier or make-up gas: 99.995%
350 connection or equivalent.
Gas Regulators and Fittings
Gas tanks may be equipped with either single- or dual-stage regulators that
contain stainless steel diaphragms. The regulator output pressure should be
adjustable from 300 to 700 kPa (45–100 psi). Each regulator should be equipped
with a 1/8-in. Swagelok compression fitting, or equivalent. Figure 1-3 shows a
dual-stage gas regulator with 1/8-in. fittings.
1.
34
1
99.995% gas requires the use of appropriate traps.
high purity, with less than 1.0 ppm each of water,
1
high purity, with less than 1.0 ppm of
1
high purity. Use a regulator with a CGA 0590
1
high purity. Use a regulator with a CGA
Gas and Plumbing Requirements
Site Preparation and Installation Manual
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