Arrgh - Model Mark IV - Hydrogen Gas Detector - Brochure

The hydrogen gas detector protects battery charging rooms and other locations where motive and stationary batteries are present by monitoring hydrogen gas levels. Lead-acid batteries on charge emit hydrogen gas after reaching the 80% recharge point. Concentrations of 4% to 75% mixed with air can be explosive. Sparks or hot surfaces can ignite them. The hydrogen gas detector will provide a warning and facilitate dissipation of the hydrogen, by operating alarms and exhaust fans before it reaches the lower explosive limit of 4%.