What principle sensor is better for combustible gas detectors?
The core component of the gas detector is the built-in sensor. Generally, according to the detection principle, there are semiconductor type, catalytic combustion type, electrochemical type, and infrared type. The different principles are also used for combustible gas detection in the scene. So what principle sensor is better for combustible gas detectors?
What sensor is better for combustible gas detectors?
1. Semiconductor sensor
In industry, combustible gas detectors rarely use the principle of semiconductor sensors. Because the detection limit of the semiconductor combustible gas detector is low and the service life is long, and there are only gas adsorption and desorption processes in the detection process, serious oily fumes in the kitchen rarely remain on the surface of sensitive materials, which will not affect the actual service life. Makes an impact and is a great choice for home alarms. In domestic places, it is usually required to be able to quickly detect when the concentration of combustible gas leakage is low, to achieve a single point alarm, and to meet the requirements of long-term maintenance-free.
2. Catalytic combustion sensor
Catalytic combustion combustible gas detector is a principle widely used in the mainstream market at present. It has a fast response speed. Up to the lower explosion limit concentration (LEL), the output of the sensor is almost proportional to the gas concentration, so the accuracy and repeatability are very high. . Therefore, the catalytic combustion combustible gas detector 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 from the adhesive and rubber products in the surrounding environment can easily poison the catalyst and cause the sensor to fail. In industrial places, the standard gas is generally used to regularly calibrate the alarm and adjust the magnification to prevent the sensitivity of the catalytic sensor from degrading and causing a large decrease in accuracy.
3. Infrared sensor
The infrared combustible gas detector uses the principle of non-dispersive infrared (NDIR) to detect hydrocarbon combustible gases in the air. It has the advantages of good selectivity, strong anti-interference ability, and not easy to be poisoned. Has played an important role in industrial safety and gas detection for many years.
4. Electrochemical sensor
The combustible gas detector adopts the principle of electrochemical sensor, which is usually used to measure toxicity, such as the detection of low concentration carbon monoxide in artificial gas and incomplete combustion. Due to the high toxicity of carbon monoxide, the alarm point generally does not exceed 200ppm. In order to prevent misuse Alarm or leak alarm, combustible gas detector is best to use electrochemical gas sensor with high sensitivity and precision.
