Sampling method and function introduction of portable four-in-one gas detector
Portable four-in-one gas detector, also called handheld four-in-one gas detector, as the name suggests, is a detector that can detect the concentration of 1-4 kinds of toxic and harmful gases at the same time. There are two gas sampling methods: diffusion type and pump suction.
Diffusion principle: The gas in the detected area slowly flows oxygen into the instrument with the free flow of air for detection. This method is affected by the detection environment, such as ambient temperature, wind speed, etc. Compared with the pump suction type, the response is relatively slow, and the characteristic is low cost.
Pump-suction principle: The instrument is equipped with a miniature air pump, and 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. It is characterized by relatively fast detection speed and response speed, and can perform long-distance measurement on relatively dangerous areas
The following is an overview of the detector:
The portable four-in-one gas detector can detect oxygen, combustible gas, toxic and harmful gases in the atmosphere, etc., and can be flexibly matched with different types of sensors, up to 6 types. The main detection principles are electrochemical, infrared, catalytic combustion, Thermal conductance, PID, etc. The detector adopts imported sensor combined with high-speed, high-precision processing circuit, which has the advantages of stable signal, high precision and good repeatability. The instrument has a built-in 5400mAH lithium battery with long standby time. With a 3.5-inch TFT screen, the content is displayed clearly. The instrument has basic functions such as real-time concentration display, real-time curve, real-time alarm status, alarm threshold setting, zero calibration, concentration calibration, etc. It also has mainstream functions such as historical data storage, historical alarm storage, data viewing and export. Can store 100,000 pieces of historical data, 1,000 pieces of alarm records
Most of the 4-in-1 gas detectors are used in various limited spaces, and are also widely used in: petroleum, chemical industry, medicine, environmental protection, storage, flue gas analysis, air treatment and other dangerous occasions that need to detect gas concentration.
