The controller is designed to provide simple analog or fully functional digital control for toxic substances, LELs, and hypoxia monitors. The controller can remotely power and operate up to eight monitors up to 100 feet away from the controller. Capable of accepting any two-wire or three-wire gas detector, it has two user-adjustable universal alarm relays that alert personnel in the event of a gas leak or failure of one of the monitors. The multi-channel controller combines multiple modes of operation to individually take channels offline to perform calibration or sensor maintenance. Each channel can be individually specified as PPM, PPB, or %. The LCD screen displays readings for all eight channels simultaneously, and trends for each channel can be viewed graphically over time.