Vaisala GM20 Carbon Dioxide Transmitter
	Quantity in Basket: None Code: VIGM20 Price: $460.00 Shipping Weight: 2.00 pounds
	Choose Model: GMD20 Duct Mount, No Display GMD20D Duct Mount with Display and Relay (Add $40) GMW21 Wall Mount, No Display (Less $20) GMW21D Wall Mount with Display and Relay (Add $40) Analog Temperature Option GMW21 only: GMA20T analog temperature option (Add $60) Local Display, Relay Option for GM20 Series: GM121 Local Display and Relay option (Add $80) GMR20 Relay option (Add $60)
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GM20 Series Carbon Dioxide Transmitters Versatile transmitters ideal for demand controlled ventilation and related applications. Available in wall and duct mount. Versatile transmitters Duct and wall mount models Incorporates the Vaisala CARBOCAP ® sensor - the silicon based NDIR Excellent long-term stability Negligible temperature dependence Easy to install Five year recommended calibration interval Carbon dioxide measurement Measurement range Accuracy (including repeatability, non-linearity and calibration uncertainty) Sensor 0 ... 2000 ppm (nominal; can be calibrated for other ranges: 0 ... 5000 ppm, 0 ... 10 000 ppm, 0 ... 20 000 ppm) ±(2 % of range + 2.0 % of reading) Vaisala CARBOCAP ® Temperature measurement (optional with GMW21) Measurement range Accuracy at +25 °C Sensor 0 ... +50 °C (+32 ... +122 °F) ± 0.5 °C (± 0.9 °F) Semiconductor IC Operating environment Temperature Humidity -5 ... +45 °C (+23 ... 113 °F) 0 ... 85 %RH non-condensing Inputs and outputs Outputs Optional outputs Operating voltage Power consumption 0 ... 20 mA or 4 ... 20 mA and 0 ... 10 V relay, LonWorks ® interface nominal 24 VAC/DC (18 ... 30 VDC) <2.5 W Mechanical Weight      GMD20(D)      GMW21 (D)      GMW22 (D) Housing material Housing classification (electronics housing GMD20) 140 g (170 g) 100 g (130 g)   90 g (120 g) ABS plastic IP65 (NEMA 4) Options and accessories GMI21 GMR20 GML20 GML20T 19222GM GMA20T GM70 w/pump option Display and relay option for GMD/W21/22 Relay output option LonWorks ® module with CO 2 signal (not available when the display option is added) LonWorks ® module with both CO 2 and temperature signals (not available when the display option is added) Calibration software kit (disk serial COM adapter) Analog temperature module for GMW21 (not available when the display option is added) Hand-held CO 2 meter for field verification GM20 Brochure   GMD20 User Guide   GMD20 Wiring Diagram   GMW20 User Guide   GMW20 Wiring Diagram