H2S Gas Detector Working Principle

Hydrogen sulfide gas detector USES imported original ampere-type electrochemical sensor, usually composed of three electrodes immersed in the electrolyte. The working electrode is made of metal with catalytic activity, which is coated on a breathable but water-repellent film. The measured gas diffuses through the porous membrane and conducts electrochemical oxidation or reduction reaction on it. The nature of the reaction depends on the thermodynamic potential of the working electrode and the analysis of the electrochemical (oxidation or reduction) property of the gas.

In an electrochemical reaction, the electrons involved in the reaction flow into (or out of) the working electrode. The working signal of the working electrode is amplified by op amp U2 to become the output signal of the instrument. The circuit maintains the voltage of the working electrode at its value of VBIAS. The reference electrode provides a stable potential for the working electrode in the electrolyte. After comparing the potential of the reference electrode with VBIAS, the output voltage signal of the operational amplifier U1 is exactly the size of generating a current signal equal to and opposite to the working electrode.
At the same time, the circuit maintains a constant potential difference between the working electrode and the reference electrode. The measuring electrode is only a second electrode required by a complete electrochemical sensor, whose main function is to allow electrons to enter or leave the electrolyte

Hydrogen sulfide gas detector has high accuracy, stable performance, reliable quality, resistance to poisoning and strong anti-jamming capability, to test the concentration of hydrogen sulfide gas for a long time, for the detection and control, when tested gas concentrations exceed alarm Settings, instruments and send out sound and light alarm, remind people to take measures, so as to prevent or reduce the scene a continuation of the dangerous degree, achieve the goal of automatic out of danger.

Hydrogen sulfide gas detector is widely used in gas, petroleum, chemical, metallurgical coking and other industries easy to produce hydrogen sulfide. Hydrogen sulfide is produced in industries such as mining and refining copper, nickel and cobalt from ore, low-temperature coking of coal, mining and refining of sulfur-bearing petroleum, rubber, rayon, tanning leather, vulcanized dyes, papermaking, pigments, pickling of vegetables, sugar beet, and animal glue. The excavation and improvement of marshes, ditches, Wells, sewers, culverts, tunnels, and operations for the removal of refuse, dirt, and faeces, as well as the exposure of analytical chemistry laboratory workers to hydrogen sulfide; Natural gas, mineral water, volcanic gas and water under the mine, often accompanied by the presence of hydrogen sulfide. Because hydrogen sulfide is soluble in water and oil, it can sometimes flow away from the source with water or oil and cause accidental poisoning.