Small Ducts & Rooftop Units

GreenTrol airflow measurement solutions have temperature and alarm capability for ducts between 4 and 16 inches in diameter, with or without a remote display. They are ideal for small ducts and volumetric airflow tracking applications.

The GF Series use the principal of thermal dispersion to determine the airflow rate. Thermal dispersion is ideal for HVAC applications that typically require measurement of low air velocities. 

Each sensing node uses two thermistors to determine airflow. One thermistor is self-heated above ambient while a second thermistor determines the ambient air temperature. The power dissipated into the airstream is directly related to the airflow rate.