Portable gas detector, the core components of knowledge popularization
Portable gas detector is an important and practical equipment, it can quickly and accurately detect the concentration of gas as well as temperature and humidity and other parameters, for environmental monitoring and safety protection provides the necessary basis. The realization of these functions can not be separated from the core components of the gas detector - gas sensor.
The gas sensor is the most critical component of the portable gas detector. According to the different types of gases to be measured, the detection accuracy and the requirements of the measurement range, the common types of gas sensors available on the market include catalytic combustion, electrochemical, thermal conductivity, infrared, and PID photo-ionization type sensors.
Catalytic combustion sensors are the most commonly used sensors for detecting combustible gases, and they are characterized by good linear output, low cost, and freedom from cross-talk with other gases. Based on the Wheatstone bridge principle, catalytic combustion sensors produce high temperatures that change the resistance of the sensing resistor by flamelessly combusting the gas under test against the sensing resistor, thus outputting a stable current signal.
Electrochemical sensors are widely used in the detection of toxic gases. This type of sensor has the advantages of stable performance, low power consumption, good accuracy and not easily contaminated by other gases. It can react with the measured gas and produce an electrical signal proportional to the gas concentration.
In addition, infrared-type sensors utilize the selective absorption property of gases in the near-infrared spectrum to determine the gas concentration by measuring the relationship between the gas concentration and the absorption intensity. This type of sensor has a series of advantages such as long life, higher sensitivity, better stability and easy maintenance.
PID light ionization sensor through the UV light source will gas ionization can be detected by the detector of positive and negative ions, and then the detected charge will be converted into a current signal, and after the corresponding algorithm to convert the concentration of the gas value.PID sensor high precision, can detect the ppb level of the gas concentration, the response speed is fast, and is commonly used in the detection of VOC volatile organic compounds. However, due to its high precision and advanced technology, the price of PID sensor is relatively high.
To summarize, gas sensors, the core component of portable gas detectors, play a key role in the detection of different types of gases. Different types of sensors have their own advantages and disadvantages, users need to choose the most suitable sensor according to the working environment and needs when purchasing. Finally, it is worth mentioning that the handheld pump-type 5-in-1 gas detector ERUN-PG71S5 produced by WinRun Environmental Protection Company is a multi-functional and high-performance instrument, which is widely used in the fields of petrochemicals, pharmaceuticals, environmental protection, flue gas analysis, air treatment, etc. It is worth recommending.
