Protects against O₂ deficiency where personnel are at risk from nitrogen leakage.

• Audible and visual alarms on all modules to provide low and critically low oxygen warning
• Base unit cannot be turned off, giving additional security to user
• Battery powered with 24 months continuous operation with separate low battery warnings
• No mains connection needed, simply screws to the wall
• Optional battery power repeater module to provide LCD display locally and/or remotely