What are the types of gas detectors?

Gas detectors can be divided into desktop gas detectors and handheld gas detectors according to the way they are used; According to the number of gases that can be detected, it can be divided into a single gas detector and a multi-gas detector; According to the principle of gas sensor, it can be divided into infrared gas detector, thermomagnetic gas detector, electrochemical gas detector, semiconductor gas detector, ultraviolet gas detector, etc. Beijing Hengtai Lida Technology Co., Ltd. is specialized in the research and development, production, sales and after-sales service of industrial gas detection instruments and fire safety and environmental protection equipment. The company's product gas detector can detect carbon monoxide, hydrogen sulfide, oxygen and combustible gas at the same time, and is widely used in confined spaces, ships, petroleum and petrochemical, chemical, steel smelting and other occasions where there are toxic and harmful gases.

According to the classification of detected gases, there are flammable gas detectors, toxic gas detectors, common gas detectors, and special gas detectors; Among them, common flammable and toxic gas detection instruments** usually range from hundreds to thousands, while special gas detection instruments** range from tens of thousands. The advantages of common flammable and toxic gas detection instruments are cost-effective and good performance, while special gases meet special inspection needs and have high accuracy, but they are expensive.

According to the classification of the place of use, there are conventional type and explosion-proof type: the conventional type is produced in accordance with the national standard to meet the needs of all environmental use, ** in the hundreds to thousands, and the characteristic is that it is cost-effective. The explosion-proof type meets the needs of all inspections in special fields, and is slightly expensive.

According to the classification of the user group, there are household and industrial use: household gas detector ** in tens to hundreds of yuan, cost-effective and easy to use, only need to be placed in the designated position to plug in the power supply to work, and can be linked to the shut-off valve, to achieve automatic processing, the hidden danger from the source cut off. The requirements for the indicators of industrial gas detectors are very high, and they must meet the safety standards used in various places such as national standards and industry standards, ranging from hundreds to thousands.

According to the classification of functions, there are single detectors and multi-function detectors: a single gas detector is mainly used to detect a certain gas in the detection site, and the use is very large. The multi-functional gas detector has a six-in-one gas detector, a five-in-one gas detector, a four-in-one gas detector, a Kurek gas detector, etc., to meet the needs of different detected gas quantities.

According to the mode of use, there are portable (handheld) and fixed (mounted, wall-mounted): portable instruments that meet the pre-operation safety detection of gas for on-site operators, usually related to the use scenario. The fixed type mainly realizes long-term uninterrupted detection, so as to ensure the safety of the place, does not require on-site personnel control, and can be intelligently linked.

According to the classification of sampling methods, there are diffusion type and pump type: the use rate of diffusion gas detectors is very common, and ** is relatively low, ranging from a few hundred yuan to several thousand yuan. The pump-suction gas detector is relatively high, usually ranging from several thousand pieces to meet the needs of special places.

According to the classification of detection principles, flammable gas detection includes catalytic combustion type, semiconductor type, thermal conductivity type and infrared absorption type; Toxic gas detection includes electrochemical type, semiconductor type, etc.

1. Gas leak detector: it can only measure whether the gas is leaking, and cannot measure the specific concentration value;

2. Portable single gas detector: handheld, it can measure the concentration value of a certain gas;

3. Portable multi-function gas detector: four-in-one, that is, it can detect four gases at the same time, and there are also five-in-one.

1. Six-in-one;

4. Fixed gas detector: fixed in a certain place to monitor the concentration of a certain gas for a long time;

5. Fixed multi-function gas detector: fixed in a certain place to monitor the concentration of certain gases for a long time, such as the K-G60-S4 of Baoshi'an, you can measure four gases at the same time;

6. Household gas alarm: for household use, only combustible gas is measured.

The common product categories of gas detectors are: combustible gas alarms, toxic gas alarms, oxygen alarms, etc.

There are fixed gas detectors, portable gas detectors, industrial gas detectors, household gas detectors, medical gas detectors and so on.

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Gas detectors, divided into combustible gases, toxic gases, inert gases.

According to the installation method, there are two types: fixed and portable.

According to the sampling method, there are diffusion type and pump type.

According to the characteristics of gases, routine detection is generally divided into combustible gases and toxic and harmful gases. According to the detector, it can be divided into portable gas detector and fixed gas detector.

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(1) Fixed gas detector.

This is the most widely used detector in industrial equipment and production processes. It can be installed at a specific detection point to detect a specific gas leak. The fixed detector is generally divided into two parts, the detection probe composed of sensors and transmission elements is installed at the detection site, and the secondary instrument composed of circuit, power supply and display alarm device is installed in a safe place for easy monitoring.

The fixed gas detector is more suitable for the continuous, long-term stability required by the detection in terms of process and technology. It is also necessary to select the type and concentration of gases on site, and also pay attention to the installation of specific gases where they are most likely to leak, such as the most effective height of sensor installation according to the specific gravity of the gas.

2) Portable gas detector.

Because the portable instrument is easy to operate, small in size, and can be carried to different production sites, the detector of the electrochemical sensor is powered by alkaline batteries, and can be used continuously for 1 000 hours; New combustible gas detectors, PID photoionization detectors and composite detectors use rechargeable batteries (some have used non-memory nickel-metal hydride or lithium-ion batteries, so that they can generally work continuously for nearly 12 hours, so as this type of instrument is more and more widely used in various factories and health departments.

First of all, know what you want to detect with a gas detection instrument? Before using an instrument for testing, you should have a general understanding of the toxic and toxic gases in the environment monitored by the instrument. If your answer is ambiguous, then a gas detection instrument may not be a good means of detection.

At this point, the gas detection work is transferred to the "expensive" laboratory analyzer - gas chromatography (perhaps mass spectrometry), and the gas samples collected at the suspicious scene are sent to the analysis laboratory for comprehensive analysis and testing, waiting for those professional analysts to give you a detailed analysis report of the gas type and concentration range, and then according to this report, find the most dangerous gas sensors in the entire environment. If there are many hazardous components, a composite gas detection instrument can be selected.

Secondly, confirm the type of gas to be detected and the concentration range.

The types of gases encountered in each production sector are different. When choosing a gas detector, consider all possible scenarios. If methane and other less toxic alkanes are predominant, the choice of LEL detector is undoubtedly the most appropriate.

This is not only because the LEL detector is simple in principle and widely used, but also because it has the characteristics of convenient maintenance and calibration. Of course, in some areas where personnel are rarely visited, maintenance is inconvenient, or combustible gas leakage is impermanent (such as confined spaces such as tanks), the use of infrared combustible gas detector is a better choice.

If there are toxic gases such as carbon monoxide and hydrogen sulfide, it is necessary to give preference to a specific toxic gas detector to ensure the safety of personnel.

If there is a possibility that organic toxic gases (VOCs) are present and their concentrations are lower than those of aromatic hydrocarbons, halogenated hydrocarbons (amines), ethers, alcohols, lipids, etc., the photoionization detector described in the previous chapter should be chosen, and the LEL detector should never be used, as this may cause personal injury.

Depending on the use occasion and industrial environment, the type of gas detector selected is also different.

1) Stationary gas detector.

This is the most widely used detector in industrial equipment and production processes. It can be installed at a specific detection point to detect a specific gas leak. The fixed detector is more suitable for the continuous, long-term stability required by the fixed detection in terms of process and technology.

Of course, they should also be selected according to the type and concentration of gases on site, and they should also be installed in the parts where specific gases are most likely to leak, such as selecting the most effective height for sensor installation according to the density of the gas.

Let's start with the type of gas to be measured.

Look at the brand and the review.

Gas detectors are widely used in industrial production, which well ensures the personal safety of construction personnel and the property safety of enterprises. So when we need to use a gas detector, how should we choose?

Clause. 1. Select according to the type of gas to be detected. The key component of the gas detector is the gas sensor, and the types of gas that can be detected by different gas sensors are also different, such as the combustion gas detector can only be used to detect combustible gas, and it is not suitable for detecting VOC gas.

Second, choose according to the functions you need. Nowadays, there are many additional functions of gas detection instruments, such as alarm, waterproof, dustproof, explosion-proof, reaction time, warm-up time, etc., which should be selected according to the actual needs.

Clause. 3. Determine whether you need a portable gas detector or a fixed gas detector. Portable gas detectors, also known as handheld gas detectors, can be carried around and detected the gas environment around you anytime and anywhere. A fixed gas detector is an instrument that is fixed in a certain area and used to monitor the gas environment in the area in real time.

Clause. Fourth, check the production qualifications. At present, due to the rapid development of the gas detector market, the quality of products is uneven, and inferior products often lead to loss of personnel and property at critical moments. It is recommended that you buy gas detectors from regular channels, such as JD.com, Tmall, etc.

Clause. Fifth, choose a reliable brand. Due to the huge difference caused by the quality of the key component of the gas detector, that is, the gas sensor, many small brands assemble their own products that are not up to standard, and there is a great risk in use.

Finally, remind everyone that the gas detector can eliminate most of the safety risks, but it cannot completely guarantee the safety of construction, and a sound safety prevention mechanism should be established during construction.

There are different types of gas detectors.

According to the sampling method: there are two types: pumping type and diffusion type.

According to the mode of use: there are two types: fixed and portable.

According to the detection principle: there are ultraviolet principle, infrared principle, PID photoion principle, catalytic combustion principle and so on.

According to the number of gases detected: single and all-in-one.

According to the classification of detection objects, there are flammable gas (including methane) detection alarm, toxic gas detection alarm, and oxygen detection alarm. According to the classification of detection principles, flammable gas detection includes catalytic combustion type, semiconductor type, thermal conductivity type and infrared absorption type; Toxic gas detection includes electrochemical type, semiconductor type, etc. Oxygen detection has electrochemical forms, etc. Classified according to the mode of use, there are portable and stationary.

According to the classification of the place of use, there are conventional type and explosion-proof type. According to the classification of functions, there are gas detectors, gas alarms and gas detection alarms. According to the classification of sampling methods, there are diffusion type and pump type.