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Invensys Limited was a multinational engineering and information technology company headquartered in London, United Kingdom. At its height, the company had offices in more than 50 countries and its products were sold in around 180 countries. [3] Invensys was formed in 1999 through the merger of BTR plc and Siebe plc. [4]
Sensors are usually designed so that the gas supply is limited by diffusion, and thus the output from the sensor is linearly proportional to the gas concentration. This linear output is one of the advantages of electrochemical sensors over other sensor technologies (e.g. infrared), whose output must be linearized before they can be used.
A gas sensor protein is a type of protein that detects and responds to specific gaseous signaling molecules, playing a role in various biological processes and environmental sensing mechanisms. Protein-based gasoreceptors are generally found in the cytoplasm of cells.
Potentiometric solid state gas sensors have been generally classified into three broad groups. Type I sensors have an electrolyte containing mobile ions of the chemical species in the gas phase that it is monitoring. The commercial product, YSZ oxygen sensor, [1] is an example of type I.
A nondispersive infrared sensor (or NDIR sensor) is a simple spectroscopic sensor often used as a gas detector.It is non-dispersive in the fact that no dispersive element (e.g a prism or diffraction grating as is often present in other spectrometers) is used to separate out (like a monochromator) the broadband light into a narrow spectrum suitable for gas sensing.
Tin dioxide is the most common material used in semiconductor gas sensors, [9] and the electrical resistance in the sensor is decreased when it comes in contact with the monitored gas. The resistance of the tin dioxide layer, typically in the range of 10 to 500 kΩ in air, can drop to a small fraction of this value in the presence of a reducing ...
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