Pneumatics Control Module; Theory Of Operation - Agilent Technologies 6890 Series Service Manual

Gas chromatograph

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Pneumatics Control Module

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

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.

Agilent 6890 Gas Chromatograph Service Manual

6890a 6890 plus