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膜进样质谱仪

The Protea ProMass analyser is a compact, robustly designed Quadrupole Mass Spectrometer (QMS) instrument incorporating all the latest mass spectrometer and vacuum pumping technology. It is a useful mechanism for gas analysis in ambient air or process applications, being able to detect and measure almost all gases with low detection limits and fast response.

 

 

When sampling from conditions that contain or have a risk of a high water or liquid present you may connect the instrument to the process using a “Membrane Barrier” sample Inlet.

The membrane barrier separates the internal high vacuum and Mass Spectrometer analyser from the sample. If there is a strong presence of liquids or liquid droplets the membrane barrier will prevent them from entering the internal vacuum and prevent contamination and possible damage.

The special membrane material allows either the gas phase or dissolved gases present in the liquids to pass quickly into the instrument for analysis.

As well as preventing unwanted liquids from entering the analyser itself it has the additional benefit of favoring many VOC components making it suitable for low level measurement of many volatile gas components such as Benzene, Toluene and Xylene.

Fig 1. shows the simple connection between the instrument and the potentially saturated process gas. Gas quickly migrates through the membrane barrier into the instrument for analysis with a response time of less than 2ms.

Fig 2 .shows the membrane barrier mounted inside the instrument and also includes a small liquid pump that draws liquid sample across the internal membrane barrier and back into the sample or away from the sample of interest. Again, dissolved gas within the liquid sample quickly migrates into the analyser for analysis by the mass spectrometer.

It may be necessary to fit a commercially available inline filter if there is a risk of particle contamination and this can easily be fitted externally to the analyser.