The HD-11 is a low voltage electronic detector of Hydrogen gas. The HD-11 is designed for connection to Fire Burglary/Alarm Control Panels and alarm control panels that work on 12 or 24 VDC can provide battery backup to the HD-11 detectors. The unit is designed to work with control panel or other building management equipment to help monitor levels of hydrogen gas in a room or a facility where hydrogen gas may be present, for example where backup power supplies, forklifts, or golf carts battery charging stations are present. The HD-11 is intended for installation in buildings in non-hazardous locations such as retail stores, office buildings, residences, and similar facilities. This Hydrogen gas detector is NOT designed to detect smoke, fire or carbon monoxide.