Design and Application of a New Low and Lower Limit Differential Pressure Flow Rate Sensor

Differential pressure flow rate sensor is widely used in gas flow rate monitoring of all kinds of mines and roadways due to its stable, reliable and low cost. By analyzing the principle and application limitations of traditional S-type pitot tube for measuring gas flow rate, this paper introduces in detail the structural characteristics, software and hardware design of a new differential pressure flow rate sensor based on self-guiding S-type pitot tube. The lower limit of differential pressure flow rate sensor is raised to 0.15m/s, which satisfies the regulation of minimum wind speed monitoring in coal mine roadway in Coal mine Safety Regulations. The performance test was completed in the laboratory, and the test results showed that the basic error of the sensor in the range of -20 ~ 50°C and the condition of slime adhesion met the requirements of industry standards.