Emerson Rosemount 370XA System Reference Manual page 27

System Reference Manual
7P00370-H01
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Valve actuation solenoids
Each analytical valve is actuated by its own four-way solenoid.
The actuation solenoid directs the actuation gas to the
appropriate pistons in its associated actuation valve.
Carrier gas pressure control valve
Electronically controls the carrier gas pressure.
370XA Gas Chromatograph
APRIL 2014