The concentration of the detected gas is attached to the gas detection transmitter . The sensor is the central department of the sensor . According to the difference in detection principle , the sensor is mainly divided into the following types of sensors: 1, metal oxide semiconductor sensor A metal oxide semiconductor sensor applies a sorption effect of a gas to be measured to change the conductivity of the semiconductor, and the alarm circuit is evoked through comparison of the current change. Because the semiconductor sensor is affected by the situation when measuring, the output line is not stable. Metal oxide semiconductor sensors are very sensitive because of their repercussions. Therefore, the commonly used category is the measurement of gas microleakage. 2, catalytic incineration sensor Catalytic incineration sensor theory is one of the most commonly used methods for detecting flammable gases. There are features such as good linearity of the output signal, reliable index, low price, and no interference with other non-combustible gases. The catalytic incineration sensor adopts the Wheatstone bridge principle, and feels that the resistance and the combustible gas in the situation generate flameless combustion, so that the temperature changes the resistance of the sensed resistance , breaks the bridge equilibrium, and outputs a stable current signal, Then through the early stage of the circuit to reduce, stabilize and handle the ultimate performance of reliable values. 3, fixed potential electrolytic gas sensor Fixed-potential electrolysis sensors are the most commonly used techniques in the field of drug detection. In this regard, foreign techniques are first and foremost. Therefore, these sensors are attached to the entrance. The structure of the cell-type oxygen sensor of the diaphragm Gagarni: On the one side of the plastic container, a polytetrafluoroethylene membrane with a permeability of oxygen of 10-30 μm is deposited, and the precious metal (platinum, gold, etc.) is adhered to the inside of the container. Silver, etc.) Cathodes, which form anodes on the inside of the other side of the container or in the vacant parts of the container (metals that are ionized by lead, cadmium, etc.). Because the anode metal is consumed in all reactions, the sensor needs to be replaced on schedule. Now that domestic technology has matured, it is possible to localize such sensors. 5, infrared sensor Infrared sensors use various elements to receive signals at a certain wavelength. They have good anti-toxicity and acute response, and they all have responses to a few hydrocarbons. But the structure is complex and the cost is high. 6, PID light ionization gas sensor The PID is formed by the UV light source and the ion chamber and other important departments. There are positive and negative electrodes in the ion chamber to form an electric field. The gas to be measured is ionized under the ultraviolet lamp, and the positive and negative ions are born. Current is formed between the electrodes and the output is reduced. The signal. PID has high sensitivity, no poisoning, and reliable insurance. Dishwasher Tub Stamping Die,Dishwasher tub part stamping die,Dishwasher Tub mould,Dishwasher Tub stamping tool Wuxi IDO Technology CO.,LTD , https://www.idotechina.com
4ã€Gavalani battery oxygen sensor