Overview 
 WD42xx series of air flow sensors, is designed for accurate measurement of pipe air flow and research and development, and installation is simple and can be used for any shape of pipe, the accurate measurement of air volume, anti-pollution ability, low maintenance, cost-effective. For HVAC, ventilation, air conditioning, clean room, laboratory room, clean room for air flow measurement 

 Features 
 * Integrated design 
 * Installation is simple, economical and practical 
 * For pipe with arbitrary shape 

 Installation 
 * The length of the sensor probe through holes or openings, plastic flange fixed installation. Adjust the angle to the wind direction and wind direction sensors. 
 * For the total air volume measurement or control, after installed in the plenum chamber 
 * When used to control air valve, air valve to send pre-installed in the branch duct or air valve after a distance of not less than 1.5m 
 * When used to control air valve, air valve to send pre-installed in the branch duct or air valve after a distance of not less than 1.5m 
 * Measure the room air supply to be adjusted according to actual measurement conditions 



 Technical parameters 

 Sensor Model WD4210 WD4220 WD4230 
 Range 50-45000m3 / h cross-sectional area <1m2 time 50-90000m3 / h cross-sectional area <1m2 time 50-360000m3 / h cross-sectional area <1m2 time 
 Accuracy 0.20% 0.20% 0.20% 
 Resolution of 0.05m / s 0.05m / s 0.05m / s 
 Power supply AC15 ... 26V DC13 ... 24V AC15 ... 26V DC13 ... 24V AC15 ... 26V DC13 ... 24V 
 Frequency 50/60HZ 50/60HZ 50/60HZ 
 Output signal 0 ... 10V 0 ... 10V 0 ... 10V 
 Power 10W 10W 10W 
 Allow cable length 0.5mm2BVVR cable 70m 0.5mm2BVVR cable 70m 0.5mm2BVVR cable 70m 
 1.0mm2BVVR cable 200m 1.0mm2BVVR cable cable 200m 200m 1.0mm2BVVR 
 1.5mm2BVVR cable 350m 1.5mm2BVVR cable cable 350m 350m 1.5mm2BVVR 
 Other non-shielded cable to be cut short cable lengths other non-shielded cable to be cut short cable lengths other non-shielded cable cable length to be shortened 
 Connect the screw terminal connector screw terminal connection terminal 3X1.5mm2 screw connection terminal 3X1.5mm2 3X1.5mm2 
 Working conditions, the probe temperature -5 ... +70 ℃ temperature -5 ... +70 ℃ temperature -5 ... +70 ℃ 
 Humidity 5% -95% humidity 5% -95% humidity 5% -95% 
 Standard probe length: 350mm (can be customized) Standard: 350mm (can be customized) Standard: 350mm (can be customized) 
 Color lime \ gray ash \ gray ash \ ash