The PureAire 8-Channel Controller is designed to provide simple analog control or full-featured digital control of toxic, LEL, and oxygen deficiency monitors. The controller remotely powers and operates up to 8 monitors up to 100 feet from the controller. Capable of accepting any two or three-wire gas detector, it features two user-adjustable common alarm relays which will, in the event of a gas leak, or a fault from one of the monitors, alert personnel.