When the oxygen concentration in the air decreases, people will feel difficult to breathe, and in severe cases, they will die due to lack of oxygen. When the oxygen concentration in the air drops to 17%, people have no effect in a static state. If they are engaged in intensive activities or labor, they will have difficulty breathing and rapid heartbeat, causing wheezing. When the oxygen concentration drops to 15%, people will have shortness of breath and feel sluggish, making them unable to engage in labor activities. When the oxygen concentration drops to 10% ~ 12%, people will lose their minds, if it takes a long time, it will pose a threat to life; when the oxygen concentration drops to 6% to 9%, people will lose consciousness, and if they are not rescued in time, they will die. The "Coal Mine Safety Regulations" stipulate that the oxygen concentration in the air flow of the mining working face shall not be less than 20%.

The harmful gases gushing from coal and rock during mining under the mine are collectively called gas, and the main components of gas areCO、H2S、CH4Such as hydrocarbon compounds. In recent years, there have been many underground accidents in coal mines in China, and the number of casualties has exceeded half of all major accidents. There are three different types of common underground gas disasters: gas explosion, gas outburst and gas combustion. In order to avoid the occurrence of coal mine accidents, underground gas detection is very important. At the same time, before going into the well, the change of oxygen concentration in the underground environment must be monitored in real time to ensure that the operating environment meets the requirements of safety management. This requires managers to install oxygen concentration alarms at multiple points underground to prevent a series of unsafe factors caused by drastic changes in oxygen concentration. At the same time, it can also prevent underground accidents.

WeApolloCompany Agent of the United KingdomAlphasenseTwo-year conventional electrochemical principle oxygen sensorO2-A2/M2, professionally usedO2Concentration monitoring and alarm. It has the characteristics of good stability, high sensitivity, fast response and high cost performance.

The main performance parameters are as follows:

1.   Test range:0-30%

2.   Sensitivity:80-120uA(20.9%)

3.   High resolution:0.1%

4.   T90 response time:

5.   Working environment:-30~50℃,10~90%RH