1. Detection of toxic gases
Electrochemical sensors for the detection of toxic gases. Electrochemical formulas include constant potential electrolytic and galvanic cell oxygen sensors. Here mainly refers to the constant potential electrolytic sensor.
Constant potential electrolytic sensor principle:
Electrodes are installed in the body of the cylindrical plastic cell, the electrolyte is filled between the electrodes, and the diaphragm made of porous tetrafluoroethylene is sealed on the top. A potential is applied between the electrodes and connected to a preamplifier. An oxidation-reduction reaction occurs between the gas and the working electrode in the electrolyte, and the equilibrium potential of the electrode changes, and the value of the change is proportional to the gas concentration.
2. Detection of combustible gas
Catalytic combustion sensor or infrared sensor. These two sensors are mainly used to detect combustible gases.
Principle of catalytic combustion sensor:
The gas diffuses into the catalytic combustion chamber of the sensor. Catalysts on the two sensor elements in the combustion chamber cause the combustible gas to burn without flame, generating heat. The temperature changes the resistance value of the sensing resistor, breaks the balance of the bridge, and generates a small voltage difference signal, which is proportional to the concentration of combustible gas, so as to achieve the purpose of detecting the concentration of combustible gas.
Infrared sensor principle:
The infrared sensor generates infrared light through an infrared generator, passes through the gas chamber filled with a sample gas, and is then received by special receivers for various gases. It is based on the principle of absorption of a specific wavelength by different elements.
3. Detection of oxygen
Diffusion combustion unit (fuel cell). It is commonly referred to as a galvanic battery oxygen sensor. For the detection of oxygen.
Galvanic battery oxygen sensor principle:
One side of the plastic container is equipped with a polytetrafluoroethylene gas-permeable membrane with good oxygen permeability, and the negative electrode of precious metal (platinum, gold, silver, etc.) tightly adheres to the inside of the container, and the anode is formed on the other side of the container or the empty part of the container. (Use lead, cadmium, and other metals with high ionization tendency). When oxygen passes through the electrolyte, the cathode and anode undergo oxidation-reduction reactions, ionize the anode metal, release electrons, and generate current.
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