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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.
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 ...
It is a one-to-one relationship with an offset of -100 kPa for boost pressure. Thus, a MAP sensor will always read 100 kPa more than a boost sensor measuring the same conditions. A MAP sensor will never display a negative reading because it is measuring absolute pressure, where zero is the total absence of pressure.
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.
An oxygen sensor (or lambda sensor, where lambda refers to air–fuel equivalence ratio, usually denoted by λ) or probe or sond, is an electronic device that measures the proportion of oxygen (O 2) in the gas or liquid being analyzed. [1] It was developed by Robert Bosch GmbH during the late 1960s under the supervision of Günter Bauman. [1]
A water in fuel sensor, or WiF sensor, is an electronic sensor used to indicate the presence of water in fuel. It is installed in a fuel filter . When the water level in the water separator reaches the warning level, the WiF sends an electrical signal to the ECU or to dashboard (lamp). [ 1 ]
Passing combustible gas raises the temperature further which increases the resistance of the platinum coil in the catalysed bead, leading to an imbalance of the bridge. This output change is linear, for most gases, up to and beyond 100% LEL , response time is a few seconds to detect alarm levels (around 20% LEL), [ 1 ] at least 12% oxygen by ...