Infrared combustible gas sensor
Among combustible gas detectors, in addition to the Catalytic gas Sensor, the most commonly used one is the Infrared combustible gas sensor. Regardless of the brand of infrared sensor used to detect combustible gas, its principle is the same.
When the gas enters the sensor, it will be illuminated by the beam of the infrared lamp. Light waves of specific wavelengths are absorbed by combustible gas molecules and then measured by another detector. The detector itself is optimized to respond well to specific gas species, usually propane or methane. When the gas concentration in the sensor increases, correspondingly, more light beams are absorbed, and the signal strength of the detector increases. This signal is sent to the microprocessor chip, and then compared with the zero reference line and calculated, the concentration value of the combustible gas is obtained.
Advantages of Infrared combustible gas sensor
Advantage 1 of Infrared combustible gas sensor: low energy consumption. Catalytic combustion sensors consume a lot of energy, but infrared sensors do not consume energy, so the entire gas detector can run longer. Roughly speaking, the energy consumption of infrared sensors is one-third that of catalytic combustion sensors.
Advantage 2 of the Infrared combustible gas sensor: Even in an environment lacking oxygen, the detection of the infrared sensor is still accurate. Because of its detection principle, it does not require the participation of oxygen. The principle of the catalytic combustion sensor determines that it must involve oxygen. Therefore, in an environment with insufficient oxygen, the detection results of the catalytic combustion sensor are inaccurate, but the infrared sensor is accurate.
Infrared combustible gas sensor advantage three: Infrared sensors will not be poisoned, while catalytic combustion sensors will be poisoned.
Disadvantages of Infrared combustible gas sensor
Disadvantage 1 of the Infrared combustible gas sensor: it cannot detect certain flammable gases, such as hydrogen, acetylene, acrylonitrile, aniline, carbon disulfide, etc. The catalytic combustion sensor can detect it.
Infrared combustible gas sensor Disadvantage 2: Infrared sensors will be affected by high humidity. Therefore, in an environment with high humidity, the detection results are not so accurate.
There is another one, but it cannot be said to be a shortcoming, because the price varies depending on the quality and performance. That is, the price of infrared sensors is more expensive than that of catalytic combustion sensors.