Development of mine-used infrared carbon monoxide sensor based on mini pump suction

Abstract

The existing mine-used carbon monoxide sensor based on electrochemical principle is susceptible to the influence of alkane gases, hydrogen benzene and other gases and the environmental pressure of the mine. Therefore, the measurement results have large errors and need to be adjusted regularly. In order to solve this problem, a mine-used infrared carbon monoxide sensor based on mini pump suction is proposed. The sensor is based on the principle of non-dispersive infrared absorption. By using the fact that CO gas has strong absorption of 4.5 μm infrared radiation, the sensor detects CO gas concentration through measuring the initial energy of infrared radiation and the energy of infrared radiation after it is absorbed by the gas. The detection sampling speed of diffusion carbon monoxide sensor is slow, and the detection results are easily interfered by external factors such as wind speed and temperature in the detection environment. In order to solve the above problem, mini pump suction method is adopted. The gas flows into the infrared sensitive element gas chamber through the flow of the mini pump to ensure the stability of the sensor airflow. The 6-month industrial test results show that, compared with traditional electrochemical sensor, the sensor has the advantages of fixed infrared wavelength and the measurement data not being affected by other gases. During operation, the maintenance period of the mine-used infrared carbon monoxide sensor is longer than 6 months. The main maintenance operation is cleaning without the replacing sensitive elements and calibration.

Keywords

• carbon monoxide sensor; non-dispersive infrared absorption; mini pump suction; co gas concentration detection