Breakthrough CO2 Sensor Technology Recalibrate Only Every Five Years 

Vaisala’s GMD/W20’s Carbon Dioxide Transmitters
Accuracy that lasts

[an error occurred while processing this directive] Woburn, MA 11/20/00 Vaisala’s GMD/W20 Series of CO 2 transmitters are so stable – they require calibration only every five years. Featuring Vaisala’s silicon-based CARBOCAP ® sensor, the GMD/W 20 transmitters provide superior stability, accuracy and temperature dependence over a broader tempera-ture range. The measurement accuracy of the sensor is not affected by dust, water vapor or most chemicals. There’s no add-on software fix or external software compensation, just excellent sensor stability – for five years! 

Easy-to-Install The GMD/W20 transmitters are easy-to-install and require almost no maintenance. They are specially designed for Demand Controlled Ventilation and related applications. Available with or without display, these duct and wall mount units can be used independently or can be incorporated into building energy management systems. The result is considerable savings in installation, operation, maintenance and recalibration costs while ensuring the best possible control of air quality. 

The GMD/W20 series transmitters measure carbon dioxide from 0…2000 ppm, though they can be calibrated for other ranges. Accuracy at +20 °C, including nonlinearity and calibration uncertainty, is <±(20 ppm + 1.5% of reading.) Long-term stability is <±100 ppm/5years. Response time is <60 seconds (10…90% response). In addition to the standard 0 …20 mA, 4…20 mA and 0…10 V outputs, there are two additional options: a LonWorks® interface and a relay output. 

Accurate and Reliable Vaisala Technology Founded in 1936 – Vaisala is a market leader in developing, manufacturing and marketing electronic measurement instruments for industry, meteorology and environmental sciences worldwide. Products include transmitters and portable meters for measuring relative humidity, dewpoint, carbon dioxide and barometric pressure.

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