Classification and application characteristics of portable gas detectors
The development of portable gas detector technology is changing with each passing day. Its development direction is miniaturization and automation, with a view to realizing long-term monitoring as the development goal. Portable gas detector technology can be used for harmful gas detection, organic voc gas detection, combustible gas detection, single gas detection wait. Accurate judgments can be made through detection. At present, in the inspection and elimination of accident precursors, industrial safety monitoring, indoor air quality detection, hazardous substance detection, environmental protection monitoring and other fields have been widely used. 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 through their sampling principle. The so-called diffusion type is to place the probe in the dangerous zone of detecting gas, and the gas to be measured diffuses into the probe from the space, and the alarm is placed in the monitoring room for indication and alarm. The pump suction type is to pump the gas to be measured into the detection probe. The suction pump is set together with the built-in gas detector. The detector is set at the dangerous place of the gas to be measured, so as to detect and execute the instruction and alarm functions.
According to the type of gas detected, portable gas detectors can be divided into toxic gas detectors and combustible gas detectors; according to detection methods, they can be divided into natural diffusion gas detectors and pump suction gas detectors; according to the number of detection , can be divided into single gas detector and multi-in-one gas detector.
The toxic gas detector detector consists of a miniature plug-in electrochemical sensor located in a 316 stainless steel housing, an epoxy-encapsulated Intelligent Transmitter Module (ITM), and a sensor splash guard. This plug-in smart sensor can automatically identify the ITM and enable seamless connection in the field. The operator operates via a magnetic wand. One of the main features is that its software guides the user through programs and menus displayed by LEDs. Use gas detector technology to detect and analyze the concentration of toxic and harmful gases in the purified exhaust smoke, evaluate the purification effect, find problems, and improve them in time to make the concentration of toxic and harmful gases discharged into the atmosphere meet the national standard.
Combustible gas detectors are detectors that respond to single or multiple combustible gas concentrations. The smart sensor transmitter used in the detector is the most complete combustible gas sensor transmitter. Among them, the infrared flammable gas detector is an ideal choice in the following application environments: frequent catalytic poisonous gas exposure, frequent high flammable gas emissions, anoxic environment, and environments where detection is not easy to achieve.
Diffusion gas detector is the gas in the detected area slowly flows the sample gas into the instrument with the free flow of air for detection, and it needs to be placed on site. This method is affected by the detection environment, such as ambient temperature, wind speed, etc., and is not suitable for air sources with low pressure. The advantage of the diffusion gas detector is that the cost is lower than that of the pump suction type.
The pump-suction gas detector is equipped with a gas sampling pump. The working method is that the power supply drives the gas sampling 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 detector is characterized by fast detection speed, long-distance measurement of dangerous areas, and maintenance of personnel safety. It is suitable for occasions where the gas detector cannot be placed on site and where there are special requirements for response speed and pressure difference.
Single gas detector, using high-performance catalytic combustion sensor, can be used in petrochemical, environmental accidents, natural gas, liquefied petroleum gas, coal gas and other industries to detect various combustible gases, including: alkanes, liquefied petroleum gases, natural gas, hydrogen, etc. . Its display unit is %LEL—lower explosion limit, with a resolution of 0.1%LEL. In addition, the single gas detector also has the characteristics of small and novel appearance, easy to carry and so on. Its parameter setting and zero calibration process can be set to password protection to prevent wrong setting and operation by non-qualified personnel. And the instrument has the function of sound, light and vibration alarm. At the same time, according to the specific needs of users, the alarm can be set to have the function of silencer and latch. The internal memory of the instrument can record the detection data of up to 30 days (the recording interval is 1 minute), and the user can upload the internal data to the PC or monitoring instrument through the infrared interface of the instrument itself for easy query and analysis.
The multi-in-one gas detector can be configured with a single gas or multiple gas sensors, and can be configured with a single, two-in-one, three-in-one, four-in-one or optional four toxic gas sensors or an optional single gas sensor for detection detection.
The portable gas detector has the following characteristics
Imported gas sensitive components are used, with high precision, strong reliability, fast response and recovery time, good gas selectivity, and strong anti-interference ability 2. LCD liquid crystal display can display the concentration of gas in real time
Small size, light weight, low power consumption, easy to carry
Using high-performance lithium battery, long working time, while using charging protection and low voltage protection, to ensure more reliable use of the battery, longer life 5, fast warm-up, fast response time
