KGF2 air flow sensor

详情

KGF2 air flow sensor is mainly used for detecting various mine tunnel, air outlet, fan wellhead sealing speed, air volume, in order to ensure the safety of underground ventilation, supporting the use of safety monitoring system of coal mine in the domestic and foreign various.
Mine intrinsically safe explosion-proof form"ExibI" 
Measuring range wind speed0.3m/s~15m/s 
 Basal area of less than 30m/s (can be arbitrarily set) 
Allowed error is less than ± 0.3m/s
Repeatability error reading the value +1% 
Output signal 200Hz~1000Hz/5Hz~15Hz  4~20mA/1~5mA/RS485 bus 
Working voltage is DC12V~18V
Working current is not more than 100mA
Transducer work frequency 140~150kHz 
Outline dimention370mm×160mm×55mm    
Quality  2kg
According to Kaman's theory into the vortex, vertical in the infinite circle flow field in anonlinear resistance is infinite (when resistance is called a vortex generating body), in a certain range of Reynolds number (Red=200~5*10000), resistance downstream will produce two row of alternating, rotating vortex column, and the vortex rateproportional from velocity. Formula: f=St V/d: f--- St - constant vortex frequency (V---)wind speed d--- bluff body diameter so, so long as the F, we can know that wind speed V, wind speed measurement can be attributed to the measurement of vortex frequency, and ultrasonic air flow sensor is the use of ultrasonic wave principle to determine the vortex frequency of vortex modulation.