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18 equipment items found
Manufactured by:Versaperm Limited based inMaidenhead, UNITED KINGDOM
In some applications, permeability measurements have to be produced gravimetrically - some formal standards demand this. Our Gravimetric permeability measurement system is designed to meet this need and is designed around a high quality solid acrylic water bath which reduces critical thermal losses. For example, the instrument on the right involves a specialised acrylic water bath explicitly ...
Manufactured by:Versaperm Limited based inMaidenhead, UNITED KINGDOM
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 ...
Manufactured by:Versaperm Limited based inMaidenhead, UNITED KINGDOM
Capacitive water vapour sensors measure relative humidity (RH) by observing changes in capacitance between conductive electrodes. The sensor works like a plate capacitor with the bottom plate under a thin polymer hygroscopic dielectric. The plate above this allows water vapour to pass throughout polymer until it reaches equilibrium with the gas under measurement. The dielectric strength of the ...
Manufactured by:Versaperm Limited based inMaidenhead, UNITED KINGDOM
Impedance water vapour sensors depend upon the absorption of water vapour by a porous non-conducting layer, (the material sample under test), sandwiched between two plate-type conductors. The active sensor layer can be extremely thin and the porous top conductor allows water vapour to flow into the sensor. Simply measuring the impedance of the resulting capacitor gives a measurement of Relative ...
Manufactured by:Versaperm Limited based inMaidenhead, UNITED KINGDOM
Thermal conductivity gas analysers are based on measuring the thermal conductivity of a gas such as hydrogen, helium or carbon dioxide and comparing it to a known reference sample using an identical thermal conductivity sensor. The sensors incorporate an extremely sensitive element with low thermal capacity. The difference in the two conductivities is a direct function of the number of atoms of ...
Manufactured by:Versaperm Limited based inMaidenhead, UNITED KINGDOM
The SIV III has been re-designed to check, accurately, that packaging seems / seals don't leak and are strong enough to hold, but gentle enough to allow easy opening. A "Seal Burst" test mode also allows you to ensure the package can meet a minimum force without failing. The SIV also has the ability to simulate shipping a packaged box of dry goods at high altitudes. The number of peaks, the ...
Manufactured by:Versaperm Limited based inMaidenhead, UNITED KINGDOM
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 ...
Manufactured by:Versaperm Limited based inMaidenhead, UNITED KINGDOM
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 ...
Manufactured by:Versaperm Limited based inMaidenhead, UNITED KINGDOM
Electrolytic water vapour sensors are based on a glass capillary tube containing two spiral wire electrodes coated with a thin layer of phosphorous pentoxide. As the gas flows along the tube moisture is absorbed by the phosphorous pentoxide (P2O5) and converted into phosphoric acid. An electrical potential is applied to electrolyze the water, producing hydrogen and oxygen and regenerating the ...
Manufactured by:Versaperm Limited based inMaidenhead, UNITED KINGDOM
Infrared gas sensors work by beaming infrared light through a gas sample and measuring the absorption spectrum produced. Many gases, such as water vapour, hydrocarbons and CO2 absorb strongly in the infrared and the frequency of the spectral peak characterises the gas. Typically, the signal produced is compared to reference spectra to identify the gas molecules. However, only one specific ...
Manufactured by:Versaperm Limited based inMaidenhead, UNITED KINGDOM
Coulometric oxygen sensor systems employ two chambers with a specimen mounted as a sealed semi-barrier between them. One chamber contains oxygen while the other is slowly purged with a stream of a carrier gas such as ...
Manufactured by:Versaperm Limited based inMaidenhead, UNITED KINGDOM
Flame Ionization detectors can be extremely accurate and are used to measure concentrations of hydrocarbons and other solvents within a gas. They are detected by burning them in an air-hydrogen flame - which creates high and precisely measurable levels of Ionization. The ionization occurs as a result of heating the carbon atoms present in the sampled gas and its level is directly proportional to ...
Manufactured by:Versaperm Limited based inMaidenhead, UNITED KINGDOM
The catalytic combustion technique is a widely used method for detecting and qualitatively measuring flammable gases. A catalytic palletised resistor or pellistor, is based on a fine coil of platinum wire, embedded within a ceramic pellet coated with a catalysts. When the surface is heated it allows oxidation to occur in a chemical reaction similar to combustion. This reaction releases heat, and ...
Manufactured by:Versaperm Limited based inMaidenhead, UNITED KINGDOM
Zirconium oxide (ZrO2) sensors, otherwise known as high temperature electrochemical sensors (or hot probes), consist of a cell made of yttria stabilized zirconia ceramic forming a crystal lattice structure which acts as a solid electrolyte. Typically, the cell is shaped like a test tube where the inner and outer surfaces are each coated with an ultra-thin layer of porous platinum to act as ...
Manufactured by:Versaperm Limited based inMaidenhead, UNITED KINGDOM
Paramagnetic oxygen sensors are based around a small glass dumbbell filled with an inert gas. The dumbbell is suspended by a platinum wire inside a cylindrical container. This is held within a non-uniform magnetic field. When a gas flows through the sensor, its oxygen molecules are attracted to the stronger areas of the magnetic field, making it rotate. This is usually measured either by an ...
Manufactured by:Versaperm Limited based inMaidenhead, UNITED KINGDOM
Ambient temperature electrochemical sensors, (often called galvanic sensors), are designed around a small cylinder which is sealed on one side using the sample under test. The cylinder includes two electrodes immersed in potassium hydroxide, though other aqueous electrolytes can be used. As the oxygen diffuses through the sample it produces positively charge hydroxyl ions at the cathode. These ...
Manufactured by:Versaperm Limited based inMaidenhead, UNITED KINGDOM
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 ...
Manufactured by:Versaperm Limited based inMaidenhead, UNITED KINGDOM
Photoionization detectors (PIDs) are fast, reliable and easy-to-use, often measuring down to the parts per million (ppm) range. When atoms in the hydrocarbon or solvent (i.e. a volatile organic compound or VOCs) are irradiated they absorb photons, which excite the atom's energy state causing it to emit an electron and ionizing the gas. Applying an electric field to the ionized vapour creates an ...