Datasheet

CO? Transmitter Series GM20

for demand controlled ventilation

The duct-mounted Vaisala CARBOCAP^? Carbon Dioxide Transmitter Series GMD20 are specially designed for demand-controlled ventilation (DCV). They are easy to install and require no maintenance. The GMD20 transmitters use?the silicon-based Vaisala CARBOCAP^??Sensor. The simple structure and?reference measurement capabilities?make this Single-Beam, Dual-Wavelength?NDIR sensor extremely?stable and reliable.?The CO₂ concentration is measured inside the duct without risks for leaks or wrong flow direction affecting the measurement.?In addition, the?measurement accuracy is not?affected by dust, water vapor and?most chemicals.?

The GMD20 series transmitters?can be used independently, or?incorporated into building energy?management systems. The series?consists of duct mount units GMD20?and GMD20D. Version D has a display.?The duct units' compact sensor head?design fits inside the ventilation duct,?eliminating the risk of leaking gaskets?and measurement errors.

The recommended calibration interval is five years.

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Features

Leak insensitive in-duct measurement

Incorporates the Vaisala CARBOCAP? sensor - the silicon based NDIR

Excellent long-term stability

Negligible temperature dependence

Five year recommended calibration interval

Warranty time 2 years

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Key Benefits

Economical choice

Using the GMD20 series transmitters ensures the best possible control of air quality and results in considerable savings in energy consumption, maintenance and recalibration costs.