Some basic principles of gas detector

If you want to understand the gas detector, it is necessary to analyze the variety of the gas detector. Gas detector, based on the detection principle of difference, can be divided into metal oxide semiconductor sensors, catalytic combustion sensor, constant potential electrolysis type gas sensor, galvanic cell type oxygen sensor, infrared sensor, PID photo ionization gas sensor. Let's take a look at the gas detector.

 

Gas detector principle:

1. metal oxide semiconductor sensor

The metal oxide semiconductor sensor is used to measure the adsorption effect of the gas, the conductivity of the semiconductor is changed, and the alarm circuit is aroused by the comparison of the current change of the process. Because the semiconductor sensor measurement is affected by the situation, the output line is not stable. Metal oxide semiconductor sensor, due to its reaction is very keen, so it is now widely used in the field of measurement of gas leakage phenomenon.

 

2. catalytic incineration type sensor

Catalytic incineration type sensor is now one of the most widely used test the truth of the combustible gas, exist linear output standard lamp number, secure index, price cheap and other characteristics.

Catalytic combustion sensor adopt the Wheatstone bridge of truth, feel the combustible gas produced in the case of resistance and flameless burning, the temperature of the felt resistance change, break bridge equilibrium, the output stable current signal, and then through the preliminary circuit reduction, stable and reliable numerical ultimate disposal.

 

3. constant potential electrolysis gas sensor

Fixed potential electrolysis type sensor is a kind of skill now poison field is the most widely applied in this aspect, foreign advanced technology, which are attached to the entrance of such sensors. Fixed structure potential electrolysis type gas sensor made in a plastic cylindrical tank body device, electrode, electrode with the task of reference electrode in the electrolyte between the electrodes is made of porous PTFE, the gap at the top of the package.

 

4. galvanic cell type oxygen sensor

Galvanic cell type oxygen sensor gap structure:on one side of the plastic container is equipped with the oxygen permeability good, 10 ~ 30 microns thick teflon breathable membrane, in its container inside precious metal electrode negative; and on the other side of the container inside or container department constitute anode to spare.

Oceanus technology professional R & D and production: four gas detection instrument, hydrogen sulfide detector, carbon monoxide detector, methane detector, gas alarm, gas alarm, gas alarm, hydrogen alarm, carbon monoxide alarm, alarm, alarm, ammonia chlorine gas detector, gas detector, toluene detector, chlorine gas detector ozone gas detector, combustible gas alarm controller, combustible gas detector, gas detector and hydrogen cyanide. Using potassium hydroxide, oxygen in the electrolyte through the anode oxidation reduction reactions, the anode metal ionization, release electrons, size and oxygen current is proportional to how much, because all the reactions of metal anode cost, so sensor needs regular replacement.

5. infrared sensor

Infrared sensor application of various elements of a certain length of the receiving principle, the existence of anti toxicity, good response, a large number of hydrocarbons have repercussions. But the structure is complex, the cost is high.

6. PID gas sensor

 

 

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