Classifying and using portable gas detectors
The development of portable gas detector technology is advancing rapidly, with the direction of miniaturization and automation, aiming to achieve long-term monitoring. Portable gas detector technology can be used for harmful gas detection, organic VOC gas detection, combustible gas detection, single gas physical examination, etc. Through detection, accurate judgments can be made. Currently, industrial safety monitoring, indoor air quality testing, hazardous substance testing, environmental protection monitoring, and other fields have been widely applied in the inspection and elimination of accident precursors. Let's take a closer look at the types and characteristics of portable gas detectors.
Portable gas detectors can be divided into diffusion type and pump suction type based on their sampling principle. The so-called diffusion type refers to placing the probe in a hazardous area for detecting gas, spreading the gas to be measured into the probe from the space, and placing the alarm in the monitoring room for indication and alarm. The pump suction type is to pump the gas to be measured into the detection probe, and the suction pump is set together with the gas built-in detector. The detector is set at a dangerous location of the gas to be measured, so as to detect and execute the indication and alarm functions.
Portable gas detectors can be divided into toxic gas detectors and combustible gas detectors according to the type of gas they detect; According to the detection method, it can be divided into natural diffusion gas detectors and pump suction gas detectors; According to the number of detections, it can be divided into single gas detectors and multi in one gas detectors.
The toxic gas detector consists of a miniature plug-in electrochemical sensor located inside a 316 stainless steel casing, an intelligent transmitter module (ITM) encapsulated in epoxy resin, and a sensor splash guard. This plug-in intelligent sensor can automatically recognize ITM and achieve seamless on-site connection. The operator operates through a magnetic rod. One of its main features is that its software can guide users to operate according to the program and LED displayed menu. Using gas detector technology to detect and analyze the concentration of toxic and harmful gases in purified smoke and dust, evaluate the purification effect, identify problems, and make timely improvements to ensure that the concentration of toxic and harmful gases emitted into the atmosphere meets national standards.
A combustible gas detector is a detector that responds to the concentration of a single or multiple combustible gases. The use of intelligent sensing transmitters in the detector is the most fully functional combustible gas sensing transmitter. The infrared combustible gas detector is an ideal choice in the following application environments: frequent catalytic toxic gas exposure, high combustible gas emissions, oxygen deficient environments, and environments where detection is difficult to achieve
A diffusion type gas detector is a device that slowly flows the sample gas into the instrument for detection with the free flow of air in the detected area, and needs to be placed on site. This method is influenced by the detection environment, such as ambient temperature, wind speed, etc., and is not suitable for gas sources with lower pressure. The advantage of a diffusion type gas detector is that its cost is lower than that of a pump suction type.
The pump suction gas detector is an instrument equipped with a gas sampling pump, which works by driving the gas sampling pump by the power supply to extract and sample the gas in the test area, and then send the sample gas to the instrument for detection. The characteristics of a pump suction gas detector are fast detection speed, remote measurement of hazardous areas, and maintenance of personnel safety. Suitable for situations where gas detectors cannot be placed on site and have special requirements for reaction speed, pressure difference, etc.
A single gas detector, using high-performance catalytic combustion sensors, can be used to detect various combustible gases in industries such as petrochemicals, environmental accidents, natural gas, liquefied petroleum gas, coal gas, etc., including hydrocarbons, liquefied petroleum gas, natural gas, hydrogen, and so on. Its display unit is% LEL - the lowest explosive limit, with a resolution of 0.1% LEL. In addition, a single gas detector also has the characteristics of small and novel appearance, and convenient portability. The parameter setting and zero calibration process can be set to password protection to prevent unauthorized personnel from making incorrect settings and operations. And the instrument is equipped with sound and light vibration alarm function. At the same time, according to the specific needs of the user, the alarm can be set to have silencing and locking functions. The internal memory of the instrument can record up to 30 days of detection data (with a recording interval of 1 minute). Users can upload internal data to a PC or monitoring instrument through the infrared interface provided by the instrument itself, making it easy to query and analyze.
