Background:

We know that gas detectors should choose corresponding gas alarms and gas detectors according to different on-site environments. In closed places, such as sewers, agricultural closed granaries, railway tankers, tunnels and other workplaces. Testing must be done before people can enter. And testing is done outside of a confined space. At this point, an alarm with built-in multi-gas detection must be selected. This is because the gas distribution and gas types in different parts of the confined space are very different. Therefore, a complete closed space gas alarm should be able to non-contact, sub-site detection and multi-gas detection function. To detect dangerous gases with different spatial distribution. And it should be a portable instrument that does not interfere with the work of the worker. Only in this way can the absolute safety of the staff entering the confined space be guaranteed.

Introduction of harmful gases in mines:

Gas detectors are gas sensors that detect gas composition and concentration. They are mostly used in mines and other places with hidden safety hazards, which greatly reduces the occurrence of some possible mine disasters.The gas composition in mines represents a wide variety of hazardous situations, among which toxic gases include: carbon monoxide, carbon dioxide, sulfur dioxide, hydrogen sulfide (H2S), nitrogen dioxide (NO2), ammonia (NH3), hydrogen (H2) etc., also including the case of insufficient oxygen. In some cases, methane may also reach explosive concentrations. Therefore, at present, different types of gas sensors are installed in many underground gas detection equipment, such as oxygen sensor, carbon dioxide sensor, carbon monoxide sensor, H2S sensor, SO2 sensor, CO sensor.

Carbon monoxide (CO) hazards and monitoring equipment：

Main hazards: Heme is the cell in the human blood that carries oxygen and expels carbon dioxide. The affinity of carbon monoxide with heme in human blood is 250 to 300 times greater than that of oxygen. Once carbon monoxide enters the human body, it first combines with heme in the blood, thus reducing the chance of heme combining with oxygen, making heme lose its function of oxygen transport, thus causing human blood to "suffocate". 0.08%, headache, dizziness and nausea in 40 minutes, 0.32%, headache and dizziness in 5~10 minutes, coma and death in 30 minutes. Main sources: blasting; mine fires; coal spontaneous combustion and coal dust gas explosion accidents, etc.

Jingxun's fixed carbon monoxide gas detector with stable performance, sensitive and reliable. With high-precision liquid crystal display, explosion-proof shell. The gas detector has the characteristics of flexible use and simple operation. The explosion-proof grade of the gas detector is CT6.A variety of high-quality probes are used to ensure that the probe is sensitive and has a long life. The stainless steel mesh is used to protect the probe part, which does not affect the gas in and out while protecting the probe; the alarm can generate a siren sound of nearly 80dB(A), and is supplemented by a red light prompt, which is highly warning.

Hydrogen Sulfide (H2S) Monitoring Equipment and Impact：

Hydrogen sulfide is colorless, slightly sweet, and has a strong smell of rotten eggs. When the concentration in the air reaches 0.0001%, it can be smelled. However, when the concentration is high, it is paralyzed due to olfactory nerve poisoning, but it cannot be smelled. The relative density of hydrogen sulfide is 1.19, and it is easily soluble in water. One volume of water at normal temperature and pressure can dissolve 2.5 volumes of hydrogen sulfide, so it may accumulate in the stagnant water in the old alley.

Hydrogen sulfide can burn, and there is a danger of explosion when the concentration of hydrogen sulfide in the air is 4.3 to 45.5%. Main hazards: Hydrogen sulfide is highly toxic and has a strong stimulating effect; it can hinder the biological oxidation process and make the human body hypoxic. When the concentration of hydrogen sulfide in the air is low, it is mainly corrosive and irritating, and when the concentration is high, it can cause rapid coma or death in the human body. 0.005~0.01%, eye and respiratory tract irritation occurs after 1~2 hours, 0.015~0.02%. Main sources: decay of organic matter; hydrolysis of sulfur-containing minerals; mineral oxidation and combustion.

Portable H2S detector, Hydrogen Sulfide detector, are used in gas storage leakage monitoring, drug factory, food factory, hospital gas disinfection residue detection, electrostatic precipitator, gas generator, air purifier, gas leakage, indoor air gas detection scene.

The influence of nitrogen dioxide (NO2) and the introduction of monitoring equipment:

Nitrogen dioxide is a brownish-red gas with a strong pungent odor, a relative density of 1.59, and is easily soluble in water. Main hazards: Nitrogen dioxide dissolves in water to generate highly corrosive nitric acid, which has strong irritating and corrosive effects on eyes, respiratory mucosa and lungs, nitrogen dioxide poisoning has an incubation period, and yellow spots appear on the fingers of the poisoned. Serious poisoning occurred in 0.01%. Main source: underground blasting work.

The NO2 gas detector independently developed by Jingxun Changtong has the characteristics of flexible use and simple operation. NO2 gas detector is used in various gas leakage places.

An introduction to sulfur dioxide (SO2)：

Sulfur dioxide is colorless, has a strong sulfur smell and sour taste, and can be smelled when the concentration in the air reaches 0.0005%. Its relative density is 2.22, and it is easily soluble in water. Main hazards: Sulfuric acid will be formed after contact with water, which has a strong stimulating effect on the eyes and mucous membranes of the respiratory system, and can cause laryngitis and pulmonary edema. When the concentration reaches 0.002%, the eyes and respiratory organs feel strong irritation; when the concentration reaches 0.05%, it is fatal in a short time. Main sources: Oxidation and spontaneous combustion of sulphur-bearing minerals; blasting in sulphur-bearing minerals; and gushing from sulphur-bearing layers.

Jingxun's portable SO2 detector is waterproof and dustproof, accurate detection data, sound and light alarm, and long service life. Portable SO2 detector can be used for indoor air detection, gas leakage, pharmaceutical factory and other scenarios. Portable SO2 detector, the body adopts ABS shell, feels comfortable, light and portable. Sensitive response, fast response speed | accurate measurement, response time ≤ 30s. Accuracy≤3%. One-key export/quick and convenient, you can enter the menu to view, and browse/delete records. Rechargeable lithium battery, support mobile power, large battery capacity, long standby time;