Micro gas chromatograph

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The new Sitrans CV incorporates micro-technology and rapidly and precisely scrutinises the value of gas for use in custody transfer, according to Siemens.

The device has a “rugged” and “explosion-proof” housing, and is both compact and suitable for use in extreme conditions from -20 to +55 degrees Celsius, says the company. The Sitrans CV can be mounted directly next to natural-gas pipelines and delivers measuring results in less than three minutes.

The new Sitrans CV process gas chromatograph determines all the necessary information on the quality of natural gas such as its calorific value, Wobbe index and density which are necessary in the many varied applications of the natural-gas industry.

The accuracy of the measurement is independent of the pressure of the sample and the ambient temperature. A display on the device shows the measuring results. The device uses miniaturised detectors and valves made with MEMS (micro-electro-mechanical systems) technology. As a result, Sitrans CV only consumes a minimum amount of carrier gas and electricity.

Furthermore, it does not need an analyser shelter, and the detectors are highly linear so that only one calibration gas is needed, reducing the operating costs and increasing availability.

Due to automatic optimisation of the measuring parameters every time calibration is carried out, the new device is also highly reliable.

Measurement components are methane up to nonane, nitrogen and carbon dioxide. Due to an internal sample switch function, up to four sample streams can be measured successively. he measuring accuracy is better than 0.1 per cent and the repeatability better than 0.01 per cent. The detection limit for pentane and higher hydrocarbons is between 10 and 50 ppm.

Due to its modular design the device can be maintained quickly and easily. All the analytical components, including the oven, are integrated in an ‘analytic module’ which can be replaced within five minutes through ‘plug and play’, reducing the overall maintenance time to half an hour.

The device runs on Windows-based software with a password protection system that prevents unauthorised access to the device’s parameters and results of analysis while a logbook documents all alarms and events.

Contract Siemens on 131 773.