What are the classifications of sensors for gas detectors?

First of all, let's talk about semiconductor gas sensors, the so-called semiconductor gas sensors use metal oxide semiconductor materials at a specific temperature to make the electrical conductor change with the change of ambient gas composition. Because of its low cost, it is more suitable for the needs of gas detection. The disadvantage is that semiconductor gas sensors are susceptible to environmental influences and are relatively less stable.

Then let's talk about thermal cell gas sensors. Each gas has its own specific thermal conductivity, and when the thermal conductivity of two or more gases is quite different, the thermal conductivity element can be used to determine the content of one of the components. The disadvantage is that there are many limiting factors for the application of gas sensors.

The second is that we will talk about the catalytic combustion gas sensor, which is a high-temperature catalyst layer prepared on the surface of the platinum resistor, and at a certain temperature, the flammable gas is catalyzed on its surface, and the resistance changes, and the change value is a function of the concentration of the flammable gas. His disadvantage is in the range of flammable gases, non-selectivity. Dark fire work, there is a risk of ignition.

Most elemental organic vapours have a toxic effect on the sensor.

Finally, let's talk about electrochemical gas sensors, which are flammable, toxic and harmful gases that are electrochemically active and can be electrochemically oxidized or reduced. Using these reactions, it is possible to distinguish the gas composition and detect the gas concentration.

Semiconductor gas sensors, catalytic incineration gas sensors, thermally conductive gas sensors, electrochemical gas sensors.

The 4-in-1 gas detector detects four gases as follows:

Combustible gas (LEL), oxygen (O2), carbon monoxide (CO), hydrogen sulfide (H2S) because these four gases are commonly produced in our production or operation process, which has an impact on our life safety. The quad-core gas detector is equipped with different gas sensors according to different gases, which is easy to maintain and suitable for flammable and toxic gas leakage.

Introduction:

The 4-in-1 gas detector is a multi-component detector that can detect multiple gases and can display the numerical index of four gases or one gas at the same time. When a gas indicator to be detected is within the alarm range, the instrument automatically performs a series of alarm actions, flashes, vibrations, and sounds.

Generally, it can be applied to enclosed and semi-enclosed spaces, as well as post-event safety inspections at the fire site. There are many fields of application, such as petroleum, chemical industry, metallurgy, mining, fire protection, gas, environmental protection, electric power, communications, papermaking, printing and dyeing, grain reserves, urban water supply, sewage treatment, food, scientific research, education, national defense and other fields.