4 products found
Versaperm Limited Products
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Universal Sensors
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Mass Spectrometer Sensors
The mass spectrometry (MS) gas detection technique is an accurate and sensitive technique that can be used for any gas. It is based on ionizing a gas or vapour to generate charged molecules which are excited in an electromagnetic field to determine their mass to charge ratios and identify each component of the gas. The MS method is widely use due to its high precision and extreme versatility – though the equipment is comparatively ...
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Semiconductor Gas Sensors
Semiconductor gas sensors are based around a metal oxide, normally SnO2. When a metal oxide crystal is heated to a certain high temperature, specific elemental molecules are adsorbed by the crystal surface with a negative charge. The sensor can be sensitised to different gases by the choice of operating temperature, microstructural modification and the use of dopants and catalysts. The donor electrons from the surface of the crystal are transferred to the ...
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Gas Chromatography Sensors
Gas chromatography involves vapourising a sample and injecting it onto the head of the chromatographic column. A flow of an inert gas (such as nitrogen, helium, argon, or carbon dioxide) carries the sample through the column which contains a stationary liquid phase which is adsorbed onto the surface of an inert solid. An extremely wide variety of gas chromatography detectors can be used depending on the specific case. Non-selective detectors respond to ...
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Pressure Based Universal Gas Sensors (Manometric)
Pressure based gas sensor systems use two chambers with the sample under test mounted between. Initially, one chamber is evacuated and the sample gas permeates through from the other chamber. A simple measurement of the gradual pressure change in the evacuated chamber determines the rate of flow across the sample and thus directly measures its permeability. At Versaperm we are not tied to any specific sensor types or manufacturer and so we can always ...