Pilot Mini Gas Alarm - One Sensor The Pilot mini gas alarm has a single gas alarm. It has one gas detection sensor on a 3.5 metre length of 3-core cable. The unit draws 98 milliamps at standby rising to 100 milliamps in the event of an alarm. Dimensions: 35mm x 53mmx 100mm. Pilot gas alarms are powered directly by a 12V battery. They sense and give an alarm for LPG, butane and propane. The units are not calibrated for diesel fumes and petrol vapour but these will be detected at higher concentrations