All sectors of society need to measure the composition or concentration of certain gases in the environment, whether differential pressure transmitters, such as the gas concentration in the underground driving face of coal mines, exceeds the standard; whether the oil port transfers oil or the hydrogen hydrocarbon components of treatment stations have leakage; c. Is the sputum concentration low? Some of these problems will bring production and personal safety problems, and some will affect product quality and quality. Laser cutting is a process where a material is cut through the use of a laser beam. This can be for small & fine materials or materials with a much greater level of thickness (e.g. metal sheets). The process simply involves the use of a focused laser beam (e.g. pulsed or continuous wave) to cut a wide range of materials to a high level of accuracy, using a process, which is highly repeatable. Fiber Laser Cutter, laser cutting profile, Laser Cut Machine, Laser Cutting Machinery, Laser Cutting Division, Tube Laser Cutting JINAN XUANLIN MACHINERY CO., LTD. , https://www.cncfiberlasers.com
The use of differential pressure transmitter gas-resistive sensor can be used to convert some of the physical parameters such as the composition or concentration of certain gases in people's hearts into resistance change, and then converted into current and voltage signals by the pre-processing circuit, and then through the post-processing circuit. Processing, the results can indirectly describe the actual value of each parameter.
Differential Pressure Transmitters There are a wide variety of gas-resistance resistors. Common types include reducing gas MQN type gas-sensitive resistors and Ti0: oxygen concentration gas-sensitive resistors.
First, reducing gas MQN type gas sensitive resistance
Reducing gas refers to certain gases that can lose electrons and increase the valence in a chemical reaction. Too much of them are volatile combustible gases such as oil, natural gas, methane, ethane, hydrogen, and so on.
Reducing gas off MQN type gas crucible resistance generally use sn02, Zn0 and other metal oxides with less salt platinum catalyst to "the other additive." Stick Eh holds a knot.蚺 蚺 ≈ 皑 皑 皑 皑 皑 图 图 Figure 14-1R stay
MqN type gas-sensitive resistors are made of insulating base, stainless steel shield brush, sintered body, and two sets of platinum wires. its
A group of platinum wire for heating. It is called heating resistance; the other group is measurement, called measuring resistance.
The gas-sensing resistor must be heated to 200-300T: The purpose is to add the gas to be measured and gas ionization process. When the semiconductor type gas-sensing resistor of the differential pressure transmitter encounters a reducing gas with a small dissociation energy on the surface, the atomic ionization of the gas to be measured is increased due to the high temperature. A large amount of electricity is dissociated from the nuclear confinement and becomes free electricity; the heat transfer applied to the fork in the high-temperature field promotes the speed of free electron migration.
Experiments have shown that helium is directed toward the surface of the sintered body by electromigration, as shown in Fig. 419. If a large amount of electricity is accumulated, the electrical f concentration on the surface of the sintered body rapidly increases, the resistivity F of the differential pressure transmitter decreases, and the resistance decreases, so that the production is the adsorption of the stomach. In general, the higher the concentration of gas to be measured, the stronger the adsorption vessel should be, resulting in a greater drop in resistivity and resistance F of the differential pressure transmitter. Equivalent resistance R. The smaller the current L is, the higher the voltage across the balance output resistor is.
The sensitivity of semiconductor gas-sensing resistors is high, and the resistance changes are nonlinear. When the concentration of the measured gas accumulated on the surface of the resistor is low, the rate of change of the resistance value is large. When the measured gas concentration is increased by a new one, the concentration of electrons accumulated on the surface of the resistor due to the adsorption effect will gradually increase, forming a negative potential layer. The rejection phenomenon is generated by the negative potential layer of j' and the free electron mobility that continues to move. Therefore, the adsorption effect gradually becomes flat, so that the dynamic equilibrium is reached and the amount of resistance change is reduced.
Use a more biohazardous part of the resistance curve. That is, when the measured gas concentration is low, the trace gas concentration and leakage can be measured. If the value segmentation is adopted, electronic circuits such as concentration detection, over-limit alarm, and gas controlled discharge can also be designed. When the gas tester is intelligent, long-distance testing and remote control of the sword can be done using computer technology. At present, differential pressure transmitter gas-sensing resistance sensors have been widely used in petroleum, chemical, power, plant cultivation, home and other fields. Unless you indicate the copyright, the instrument exhibition network articles are original, reproduced please specify URL: level transmitter: .
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