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Vol. 9 No.3 June 2001   

Portable Gas Chromatograph

Portable Gas ChromatographGas chromatograph is normally a bench-top laboratory instrument for qualitative/quantitative analysis of chemicals in food, pesticide and drug industries. To provide a field-based detection equipment for monitoring and quantitating chemical warfare agents, a portable gas chromatograph has been developed for field use. The equipment comprises an adsorbent-based input preconcentrator and a wide-bore capillary column as GC separator kept in an oven, followed by a photoionisation detector to provide electrical signal. The signal is received by a microprocessor onboard a data acquisition and alarm system for identification of the chemical present. The system gives alarm and provides the chromatogram on its inbuilt printer.

Important Characteristics

Sensitivities  < 0.03 mg/M, ( H agents)
< 0.01 mg/M (G agents)
Response time  < 3 min
Power 24V DC and AC mains
Output    Alarm and plotter
Weight   5 kg without batteries
Status   Fitted in NBC reccee vehicle

Features

Carrier gas      Air itself
Sensitivity   An order of magnitude better than NATO standards
Alarm  Visual display, both qualitative and quantitative

The portable gas chromatograph can be programmed for detection of other types of chemicals after modification. It does not use any consumables other than batteries.