How it Works:

The FilterPulse™ shines a light beam through an HVAC air filter and receives the light that passes through the filter. When a new clean filter is inserted, the filter reset is pressed. An initial light measurement is made calibrating the sensor with the starting base-point of the new filter. Later measurements are compared with the initial measurement. The alarm indicates when the measured light sensed drops below the dirty status trip point. This calculation method allows the FilterPulse™ to accurately detect the proper replacement threshold on nearly all varieties and brands of filters. Plus, unlike other products, the FilterPulse™ accurately operates regardless of the HVAC blower speed or pressure fluctuations in the system.