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Air volume sensor technical parameters

Air volume sensor introduction

Mine intelligent air volume sensor is mainly used for the detection of wind speed and air volume in various tunnels, tuyeres, fanheads and other underground mines to ensure the safe production of coal mines.

Air volume sensor technical parameters

1. Explosion-proof form: ibI (mine intrinsically safe type)

2. Measuring range: wind speed 0.3 ~ 15m / s

3. Tunnel cross-section area: less than 30m2 (arbitrarily set)

4. Measurement error: less than + 0.3m / s

5. Repeatability error: reading +1 [%]

6. Working voltage: 9-18V

7. Working current: less than 60mA

8. Output signal: Frequency: 200-1000Hz, 0-200Hz, 5-15Hz Current: 1-5MA, 4-20MA

9. Transmission distance: more than 2km

10. Shape size: 280 × 160 × 68; weight: 2kg

Working principle of air volume sensor

According to the Kaman vortex joint theory, when a non-limiting length non-linear resistance body is vertically inserted in the unrestricted boundary flow field (the resistance body is called a vortex generator), it is within a certain Reynolds number range (Red = 200 ~ 5 * 10000), there will be two rows of alternating, swirling vortex rows downstream of the resistance body, and the vortex ratio is proportional to the flow velocity. The formula is expressed as: f = St V / d where: f --- vortex frequency St-constant (strajhar number range is 0.21) V --- wind speed d --- the diameter of vortex generator From f, you can know the wind speed V, so the measured wind speed comes down to measuring the vortex frequency, and the ultrasonic air volume sensor uses the principle of vortex modulation to determine the vortex frequency.

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