Patent ID: 6357532
Filing Date: 2002-03-19
Classification: A62C,B01F

Abstract:
A compressed air foam system comprising:water flow path through the compressed air foam system, the water flow path having a water inlet; a water and foam chemical mixer flow connected to the water inlet, the water and foam chemical mixer having a foam chemical inlet and a water/foam chemical outlet; an air compressor having an air inlet, an air outlet connected to the water flow path, and an air flow controller at the air inlet; and a control system operatively connected to the air flow controller of the air inlet to the air compressor, the control system having a proximity sensor in the water and foam chemical mixer, the proximity sensor located in sensing relationship to a movable flow control piston and in sensing relationship with the water flow path through the compressed air foam system, the flow control piston having a metallic portion located adjacent the proximity sensor.