The GM20 series transmitters are specially designed for demand controlled ventilation and related applications. The transmitters incorporate the new silicon based Vaisala CARBOCAP® sensor. The simple structure and reference measurement capabilities make this Single-Beam Dual-Wavelength NDIR sensor extremely stable and reliable. Dust, water vapor or most chemicals do not affect the measurement accuracy of the sensor.

The GMT220 series is for a wide range of industrial carbon dioxide applications including greenhouses, fruit storages, safety alerts and demand-controlled ventilation in mushroom farms, livestock husbandry and parking garages. The GMT220 transmitters are designed to measure carbon dioxide in harsh and humid environments. The housing is dust and waterproof to IP65/NEMA4. The materials have been chosen for extended corrosion resistance.

The GMW25 and GMW45 transmitters are ideal for monitoring the air quality in public, commercial and residential buildings. The transmitters incorporate the Vaisala CARBOCAP® Sensor. Due to the built-in reference measurement capabilities the transmitters are extremely stable and reliable. The measurement is not affect by dust, water vapor or chemical vapors present in the normal indoor environment.