Breakthrough CO2 Sensor
Technology Recalibrate Only Every Five Years
Vaisala’s GMD/W20’s Carbon
Dioxide Transmitters
Accuracy that lasts
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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