The Key Distinction Between Fixed and Portable Gas Detectors
With the development of the times, the country has also made great progress in terms of economic development, especially for the continuous growth of my country's electricity, coal, oil and municipal construction security, which also leads to safety or toxic and harmful gases. The testing, and even the demand for testing products is becoming more and more extensive, and the requirements for product diversification and high quality are significantly increased. At this point, I will introduce you to the fundamental difference between portable gas detectors and fixed gas detectors.
First of all, we need to understand that there are two types of portable gas detectors: pump suction type and diffusion type. Diffusion type gas detector is that the gas in the detection area flows freely in the air and slowly flows the sample gas into the instrument for detection. This method is affected by the detection environment, such as ambient temperature, airflow, etc. Diffusion gas detectors are characterized by low cost. The pump-suction gas detector is equipped with a small air pump. Its working method is that the power supply drives the air pump to extract and sample the gas in the area to be measured, and then send the sample gas into the instrument for detection. The pump-suction gas analyzer is characterized by fast detection speed, long-distance measurement of dangerous areas, and maintenance of personnel safety. Others are the same as diffusion gas detectors.
Secondly, we also need to master the working principle of the gas detector. For example, the working principle of the pump suction and diffusion gas detectors is basically the same. The carbon dioxide analyzer detects the sample gas through the sensor of the instrument and then amplifies it through the circuit. The sorting is converted into the corresponding value and displayed on the screen. Catalytic combustion sensors are commonly used in combustible gas detectors, and electrochemical sensors are commonly used in toxic gases.
For fixed gas detectors, more detectors are used in industrial devices and production processes. The temperature and humidity recorder can be installed on a specific detection point to detect specific gas leakage. The fixed detector is generally a two-body type. The detection head composed of a sensor and a transmitter is integrated and installed on the detection site. The secondary instrument composed of a circuit, power supply and display alarm device is installed in a safe place as a whole, which is convenient for monitoring. .
The detection principle of the fixed gas detector is the same as that described in the previous section, but it is more suitable for the characteristics of continuous and long-term stability required by fixed detection in terms of process and technology. They should also be selected according to the type and concentration of the on-site gas. At the same time, attention should be paid to installing them in the part where the specific gas is most likely to leak. For example, the most effective height of the sensor installation should be selected according to the specific gravity of the gas.
