vaisala GMD/W20 二氧化碳变送器 维萨拉VAISALA

Features/Benefits
▪ Versatile transmitters
▪ Reliable measurement with sensor inside the duct
▪ Incorporates Vaisala CARBOCAP® Sensor - the silicon-based NDIR sensor
▪ Excellent long-term stability
▪ Negligible temperature dependence
▪ Ease of installation

Performance CARBON DIOXIDE MEASUREMENT
Measurement range 0 ... 2000 ppm (nominal; can be calibrated for other ranges: 0 ... 5000 ppm, 0 ... 10,000 ppm, 0 ... 20,000 ppm) Accuracy (including repeatability, non-linearity and calibration uncertainty) ± (2 % of range + 2% of reading) Long-term stability <±5 % of range / 5 years Response time (63%) 1 minute Warm-up time 1 minute, 15 minutes full specifications Accessories and Options Display and relay option for GMD20 GMI21 Relay output option GMR20 LonWorks® module with CO2 signal GML20 (Not available when display option is added) Serial COM adapter 19040GM Hand-held meter for field verification GM70 Operating Environment Temperature -5 ... +45 °C (+23 ... +113 °F) Humidity 0 ... 85 %RH, non-condensing Flow velocity (GMD20) 0 ... 10 m/s Electromagnetic compatibility EN61326-1, Generic Environment Mechanics Housing material ABS plastic Housing classification (GMD20 electronics housing) IP65 Weight: GMD20 (D) 140 g (170 g) Inputs and Outputs Outputs 0 ... 20 or 4 ... 20 mA and 0 ... 10 V Optional outputs relay LonWorks® interface Resolution of analog outputs 8 bits Recommended external load: current output max. 500 ohm voltage output min. 1 kohm Operating voltage nominal 24 VAC/DC (18 ... 30 VDC) Connections screw terminals, wire size 0.5 ... 1.5 mm2 Power consumption <2.5 W