DAS200 & DAS250 (AMP Sensor)
The DAS200 device senses when a clothes dryer is drawing 1.2 Amp. of current. When this occurs a relay contact closes turning the dryer vent booster fan “ON”. When current drops below the 2 Amp. threshold the relay contacts open turning the booster fan “OFF”.
The DAS250 device senses when a clothes dryer is drawing1.2 Amp. of current and then closes the output switch to activate the dryer vent booster fan. When the dryer cycle is complete and the current drops below  the threshold, the output switch will remain closed for 5 minutes to allow heat to be removed from the vent before the switch is opened again.