Portable gas detectors: Classification and Application Characteristics
The development of portable gas detector technology is constantly changing, with its development direction being miniaturization and automation, with the goal of achieving 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 testing, 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 from the space into the probe, and placing the alarm in the monitoring room for indication and alarm. The pump suction type, on the other hand, sucks the gas to be measured into the detection probe. The suction pump is located together with the gas built-in detector, which is located at a dangerous location of the gas to be measured, in order to detect the execution of instructions and alarm functions.
Portable gas detectors can be divided into toxic gas detectors and combustible gas detectors according to the type of gas detected; 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 micro plug-in electrochemical type sensor located in a 316 stainless steel casing, an intelligent transmitter module (ITM) encapsulated in epoxy resin, and a sensor splash shield. This plug-in intelligent sensor can automatically recognize ITM and achieve seamless on-site connection. The operator operates through a magnetic rod. One of the main features is that its software can guide users to operate according to the program and LED displayed menus. Use 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 discharged 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 for the following application environments: frequent catalytic 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 where the gas in the detected area slowly flows into the instrument with the free flow of air for detection, and needs to be placed on site. This method is influenced by the detection environment, such as environmental temperature and wind speed, and is not suitable for low pressure air sources. The advantage of a diffusion type gas detector is that its cost is lower than that of a pump suction type.
The pump type gas detector is equipped with a gas sampling pump, which works by driving the power supply to sample the gas in the area to be tested, and then sending the sample gas to the instrument for detection. The characteristic of the pump suction gas detector is its fast detection speed, which can measure dangerous areas remotely and maintain 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 petrochemical, environmental accidents, natural gas, liquefied petroleum gas, coal gas, etc., including hydrocarbons, liquefied petroleum gas, natural gas, hydrogen, etc. 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 compact and novel appearance, and convenient portability. The parameter setting and zero calibration process can be set to password protection to prevent incorrect settings and operations by non qualified personnel. And the instrument has an audible and visual vibration alarm function, and 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 the internal data to a PC or monitoring instrument through the infrared interface provided by the instrument itself, making it easy to query and analyze.
