User manual VAISALA GMD-W20 DATASHEET 1

[. . . ] Box 26, FI-00421 Helsinki, FINLAND Tel: +358 9 894 91 Fax: +358 9 8949 2485 Email: industrialsales@vaisala. com www. vaisala. com/GM20 GMD/W20 Series Carbon Dioxide Transmitters for Demand Controlled Ventilation Applications Features/Benefits · · · · · · Versatile transmitters Duct and wall mount models Incorporates Vaisala CARBOCAP® Sensor - the silicon-based NDIR sensor Excellent long-term stability Negligible temperature dependence Ease of installation The GMD/W20 series transmitters are designed for use in ventilation-related applications. The duct mounted Vaisala CARBOCAP® Carbon Dioxide Transmitter Series GMD20 and wall mounted GMW20 are specially designed for Demand Controlled Ventilation (DCV). [. . . ] 10 V outputs, there are three other options: two LonWorks® interfaces and a relay output. The relay output is standard with the display units. Improve indoor air at minimal energy costs The use of the GMD/W20 series transmitters ensures the best possible control of air quality and results in considerable savings in energy consumption, maintenance and recalibration costs. Vaisala CARBOCAP® technology The GMD/W20 Series Transmitters use the silicon-based Vaisala CARBOCAP® Sensor. The simple structure and reference measurement capabilities make this Single-Beam, DualWavelength NDIR sensor extremely stable and reliable. In addition, the measurement accuracy is not affected by dust, water vapor and most chemicals. Temperature option The GMA20T temperature module, an option with the GMW21 wall mount unit, combines both CO2 and temperature measurement into one transmitter. A GMD/W20 CARBON DIOXIDE Technical Data Performance Carbon dioxide measurement Measurement range 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 Temperature measurement (optional with GMW21) Output signal 0 . . . [. . . ] 10 m/s EN61326-1, Generic Environment ABS plastic IP65 140 g (170 g) 100 g (130 g) 90 g (120 g) GMW21 and GMW21D 80 Mechanics Housing material Housing classification (GMD20 electronics housing) Weight: GMD20 (D) GMW21 (D) GMW22 (D) 42 60 108. 5 83 66. 7 Accessories and options Display and relay option for GMD/W21/22 GMI21 Relay output option GMR20 GML20 LonWorks® module with CO2 signal (Not available when display option is added) GML20T LonWorks® module with both CO2 signal and temperature signals (Not available when display option is added) Calibration software kit (disk and serial COM adapter) 19222GM Analog temperature module for GMW21 (not available when display option is added) GMA20T Hand-held meter for field verification GM70 GMW22 and GMW22D 60 CARBOCAP® is a registered trademark of Vaisala. [. . . ]