Hydrogen Gas Detectors for UPS Rooms & Battery Rooms. Flooded & VRLA Batteries generate hydrogen (H2) gas. H2 Gas Product increases during charging or malfunction. Hydrogen gas is highly explosive in nature & hazardous. Hydrogen Gas Levels should be monitored at all times. H2 Gas Alarm should trigger alarms & ventilation systems. At higher alarm levels, the charging shall be cut-off. Emergency ventilation shall dilute the room and reduce risk. Contact us for more information.