In some environments where hydrogen sulfide gas exists, the application of hydrogen sulfide detector is indispensable. It can not only detect the concentration of hydrogen sulfide, but also alarm the concentration of hydrogen sulfide in the environment during detection. When the concentration of hydrogen sulfide in the environment exceeds the safe value, the hydrogen sulfide detector will send out various alarm signals to remind us, So that we make the appropriate security measures in advance. So do you know how Hydrogen Sulfide Detector works? The following is a brief introduction by yi yun Tian:

working principle of hydrogen sulfide detector:

Hydrogen sulfide detector adopts imported original amperometric electrochemical sensor, usually composed of 3 electrodes immersed in electrolyte. The working electrode is made of a catalytically active metal coated on an air permeable but hydrophobic membrane. The gas to be measured diffuses through the porous membrane, where it is subjected to an electrochemical oxidation or reduction reaction. The nature of the reaction depends on the thermodynamic potential of the working electrode and the electrochemical (oxidation or reduction) nature of the gas to be analyzed.

Electrons participating in the electrochemical reaction flow into (reduction) or out of (oxidation) the working electrode.The working signal of the working electrode is amplified by the operational amplifier U2 to become the output signal of the instrument. The circuit simultaneously maintains the voltage of the working electrode at the value of its bias voltage VBIAS. The reference electrode provides a stable potential for the working electrode in the electrolyte.

after the reference electrode potential is compared with VBIAS, the output voltage signal of the operational amplifier U1 is exactly the same as the current signal 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 the second electrode required for a complete electrochemical sensor, and its main function is to allow electrons to enter or flow out of the electrolyte.

In summary, it is the working principle of the hydrogen sulfide detector. It is precisely because of the unique advantages of the hydrogen sulfide detector itself that it can be widely used in the oil and chemical industry, artificial gas, metallurgy, steel, coking, electric power, tunnels, mines and other dangerous operating environments. The staff are easily exposed to the threat of hydrogen sulfide leakage. It is an ideal controller to ensure property and personal safety.