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Jun 2001
Inlets
Agilent 6890 Gas Chromatograph Service Manual
270 Pneumatics Control Module
Theory of operation
The PCM provides one channel of flow or pressure control, replacing the
standard electronic flow control module (ECM) for that channel. It does not
need to be connected to any particular type of inlet.
The PCM can control gas flows and pressures for a number of applications
including:
• Non-Agilent standard inlets. For example, the SIMDIS application which
uses a proprietary PTV inlet by one of Agilent's channel partners.
• Any valve application where no inlet is required. For example, the PCM
can provide flow or pressure to a column connected to a gas sampling
valve. Other valving applications may involve providing auxiliary gas
flow; especially when using packed columns.
• Sample preparation devices such as the Headspace Sampler and the
Purge and Trap, which often require a controlled source of purge gas.
• Catalyst tubes or other conversion devices, which often require a
controlled source of makeup or reagent gas. The nickel catalyst tube is
an example of such a device.
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