Actuation Gas; Helium Actuation Gas; Alternative Actuation Gas - Emerson Rosemount 370XA System Reference Manual

370XA Gas Chromatograph
APRIL 2014
3.6

Actuation gas

The analytical valves require actuation gas to operate. When helium
is used as a carrier gas, the default configuration is to also use helium
as the actuation gas. When hydrogen is used as a carrier gas, or if
there is a desire to minimize helium usage, another clean dry gas
such as nitrogen or clean-dry air should be used as the actuation gas.
Actuation gas specifications
Moisture content
Particulate
Supply pressure
NOTICE
If you intend to use locally generated instrument air, ensure that the pressure is
sufficient and use filters and dryers to ensure the actuation gas will meet the above
specifications in order to avoid excessive maintenance.
3.6.1

Helium actuation gas

When the carrier gas is also used as the actuation gas, the actuation
gas supply connection should be teed from the helium supply after the
moisture filter.
3.6.2

Alternative actuation gas

If a gas other than the carrier gas is to be used as the actuation gas,
the supply should be connected directly to the actuation gas port on
the 370XA gas manifold. The actuation gas should be nitrogen, dry
air, or some other non-hazardous gas.
System Reference Manual
Less than 5 ppm
Less than 2 microns
90 PSI (620 kPaG)
7P00370-H01
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