How to choose a good gas sensor

How to choose a good gas sensor

How to choose a good gas sensor

Table of Contents

If you search “gas sensor” on , you can find a lot of gas sensors. We know that the air component is diverse, and a certain gas sensor can detect one or more air components, so we designed a series of gas sensor.

There are about 20 kind of gas sensors for sale. They have similar name, it’s likely to cause confusion. Hope that through the following presentation, we can help you to choose the appropriate gas sensors easily.

It’s obvious that different sensor can detect the same gas. Such as MQ-3, MQ-6, MQ-7 Sensor, JXCT GAS Sensors can detect Alcohol. So if you want an alcohol sensor, then which on should you chosen? Although most of the above sensors are able to detect Alcohol, but you should know that they have different range to Alcohol.

Semiconductor type

In general household places, it is usually required to be able to quickly detect when the concentration of flammable gas leakage is low, and to achieve a single-point alarm. Moreover, it must be able to meet the requirements of long-term maintenance-free, which is convenient for home use.

The semiconductor combustible gas sensors has a low detection limit and a long service life. During the detection process, there is only gas adsorption and desorption. The serious oil fume in the kitchen rarely remains on the surface of the sensitive material, which will not affect the actual service life. So semiconductor sensor is the best choice for domestic gas leak alarms.

2. Catalytic combustion type

Catalytic combustion gas sensors is the widely used sensor in the world at present. It has short response time. Up to the lower explosion limit (LEL), the output of the sensor is almost proportional to the gas concentration, so the accuracy and repeatability are very high. It is suitable for quantitative detection in coal mine, petroleum, chemical industry, gas and other fields.

However, the catalytic combustion sensor has a high working temperature, and the catalyst is easily deactivated. At the same time, the silicone and sulfide released by the adhesive and rubber products in the surrounding environment can easily poison the catalyst and cause the sensor to fail. In industrial places, the detector is usually calibrated regularly by standard gas, and the magnification is adjusted to prevent the sensitivity of the catalytic sensor from being degraded and the accuracy will be greatly deteriorated.

3. Electrochemical type

For the detection of low-concentration carbon monoxide in the incomplete combustion process of coal gas, due to the high toxicity of carbon monoxide, the alarm point generally does not exceed 200ppm. In order to prevent false alarms or leakage alarms, it is best to use electrochemical gas sensors with high sensitivity and precision .

4.Infrared type

The infrared combustible gas sensors uses the principle of non-dispersive infrared (NDIR) to detect hydrocarbon combustible gases in the air. With the advantages of good selectivity, strong anti-interference ability, and not easy to be poisoned, it has played an important role in industrial safety and gas detection in recent decades.

Electrochemical gas sensor- gas detection sensor module – YouTube

portable gas detector- #Ozone gas detection – YouTube

NDIR gas sensor -gas detection -Youtube

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