What are the classifications of sensors in gas detectors?
The gas detector is an instrumentation instrument for gas leakage concentration inspection. The first thing is the portable/handheld gas detector. The gas sensor is used first to check the type of gas present in the environment. The gas sensor is a sensor for checking the composition and content of the gas. It is generally believed that the definition of a gas sensor is based on an inspection policy. That is to say, the sensor used to check the composition and concentration of the gas is called a gas sensor, and whether it is a physical method or a chemical method. For example, sensors that check gas flow are not considered gas sensors, but thermal conductivity gas analyzers are attributed to major gas sensors, although they sometimes use a generally consistent inspection principle. Semiconductor gas sensor It is based on the principle that some metal oxide semiconductor materials are used, and the conductivity changes with the change of the composition of the ambient gas at a certain temperature. For example, an alcohol sensor is prepared by the principle that the resistance of the tin dioxide is drastically reduced when the alcohol is encountered at a high temperature. Catalytic incineration gas sensor The sensor is prepared by forming a high-temperature resistant catalyst layer on the surface of the platinum resistor. At a certain temperature, the flammable gas is catalytically incinerated on the surface. The incineration is a function of increasing the temperature of the platinum resistance, changing the resistance, and changing the value as a function of the flammable gas concentration. Thermal conductivity gas sensor Each gas has its own specific thermal conductivity. When the thermal conductivity of two or more gases is different, the thermal conductivity element can be used to distinguish the content of one component. This sensor is now used for hydrogen gas inspection, carbon dioxide inspection, and high-concentration methane inspection. Electrochemical gas sensor A suitable portion of the flammable, toxic and harmful gases are electrochemically active and can be electrochemically oxidized or restored. Using these responses, it is possible to distinguish between gas components and gas concentrations. Electrochemical gas sensors are divided into many subclasses (1), galvanic gas sensor (also known as: Gaffney battery type gas sensor, also known as fuel cell type gas sensor, also known as conscious battery type gas sensor), their principle is the same as our dry battery, only, The carbon-manganese electrode of the battery was replaced by a gas electrode. Taking an oxygen sensor as an example, oxygen is recovered at the cathode, and electrons flow through the ammeter to the anode where the lead metal is oxidized. The size of the current is directly related to the concentration of oxygen. This sensor can effectively check oxygen, sulfur dioxide, and the like. This gas sensor has a narrow application range and many constraint elements. (2) Stable potential electrolytic cell type gas sensor, which is very effective for checking the recovery gas. Its principle is different from that of the galvanic sensor. Its electrochemical response is caused by the current being forced. A real Coulomb profiling sensor. This type of sensor has been successfully used in the inspection of gases such as carbon monoxide, hydrogen sulfide, hydrogen, ammonia, helium, etc., and is a dry flow sensor for toxic and harmful gas inspection. (3) Concentrated battery type gas sensor, electrochemically active gas on both sides of the electrochemical cell will consciously constitute a concentrated electromotive force, and the size of the electromotive force is related to the concentration of the gas. A successful example of such a sensor is oxygen for a car. Sensor, solid electrolyte type carbon dioxide sensor. (4), limit current type gas sensor, there is a sensor for measuring oxygen concentration using the principle of limiting current in the electrochemical cell and carrier concentration to prepare oxygen concentration sensor for oxygen check of car, and oxygen concentration check in molten steel . Multifunctional Children's Study Table Chair Set Myopia in young people is generally triggered by means of horrific habits in the getting to know process, such as incorrect sitting posture and bad lighting. The studying surroundings created through a excellent gaining knowledge of desk is nevertheless beneficial for stopping myopia, so purchase anti-myopia studying desks for children. let kids strengthen excellent learn about habits, which will accompany them for a lifetime.
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