The Vaisala GMD/W20 transmitters are easy to install and require almost no maintenance (the recommended calibration interval is five years). They are specially designed for Demand Controlled Ventilation and related applications. The use of the GMD/W20 transmitters results in considerable savings in installation, operation, maintenance and recalibration costs as well as ensures the best possible control of air quality.

• 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

The GMW20 series transmitters can be used independently or they can be incorporated into building energy management systems. The wall mount GMW series transmitters are available in two sizes (GMW21 and GMW22). The GMD20 is a duct mountable transmitter.

Optional LonMark® approved interface modules are available for digital communication between the transmitters and a LonWorks network.

An analog temperature option is available for the GMW21. The GMA20T offers active temperature measurement using a semiconductor sensor IC.

The measurement module has a voltage output of 0...10 V, corresponding to a measurement range of 0...50 ºC. The accuracy of the module is 0.5 ºC.

For more information, see our section on carbon dioxide measurement.

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