Halogen’s Terminator emergency shutoff system sequentially closes 150 lb. cylinder valves containing toxic gas in less than three seconds when activated from remote sensors and switches. The operator would then be required to correct the condition, check the facility and manually reset the valve before restarting the gas system. The Gemini controller has a self-contained battery system that guarantees the operation of the motorized closing mechanism even during a power failure. This dual-torque microprocessor controlled system applies 40 foot-pounds of torque for emergency closures of the cylinder valve.