Mine mining is a comprehensive project involving many aspects. It not only includes public transportation, mining, ventilation, etc., but also includes enterprise management, blasting, machinery, ecological environment protection and many other contents. Compared with other industries, there are many unsafe factors of its own, whether it is the work itself or the workplace.

The mine is a closed, windless and confined space environment, which puts forward high requirements for the health and safety of miners. Underground oxygen concentration is an important index, which is very important for miners and underground operation. Oxygen is the gas for human survival, mine workers must have enough oxygen for production activities. The Safety Regulations for Metal Mines stipulate that the oxygen content in the underground working environment should not be less than 20%, and the fresh air volume required for underground workers should be 4 m/min. When the oxygen content in the underground working face is less than 20%, workers are prohibited from working.

For coal mining enterprises, in order to protect the life and health of production personnel, they are in the process of coal mining, in the mining area, the main roadway or ventilation roadway to install oxygen alarm to monitor the concentration of O2 (oxygen) gas.

The sensors in the oxygen alarm all use oxygen sensors, and the oxygen sensors developed by Alphasense companies are popular in the market due to their good linearity and high sensitivity. by the agent'sAlphasenseCompanyThe oxygen sensor (O2-A2) is one of the most popular gas sensors on the market. The oxygen sensor (O2-A2) is mainly used to measure the concentration of oxygen gas in the environment. According to the different measurement range and the length of the working life, the oxygen sensor has multiple models, such: long-life oxygen sensor (O2-A3), oxygen sensor (O2-A2), oxygen sensor O2-A1(1 year life), oxygen sensor O2-G2 (small size), oxygen sensor O2-C2, oxygen sensor O2-C3, etc.

Main characteristics of oxygen sensor (O2-A2):

(1)Oxygen sensor measuring range: 0-30% VOL

(2)Working life:>24 months (the number of months when 85% of the initial signal is reached)

(3)Size (mm):Ф 20.3x 16.8mm

(4)Output: 80-120μA (@ 22°C, 20.9% O2 concentration)

(5)Response time t90 (seconds):<15 (from 20.9% to 0 (load 472 Ω))

(6)Linearity (ppm):<0.6 Linearity error at full scale (zero, 400ppm)

(7)Weight:< 169g

(8)Temperature range:-30-55 C

(9)Pressure range: 80-120Kpa

(10)Humidity range: 5-95% RH

(11)Storage time: June (storage temperature 3-20 ℃)

        (12)Load resistance: 47-100Ω

Please consult for details.