Purchase the appropriate gauge for your helicopter. For example, an R-22 helicopter is a two-seat bird so a smaller CO monitor and detector is suitable, whereas an Aerostar A-Star is a five-passenger helicopter necessitating the need for a larger CO detector.
Purchase the gas leak detector for your helicopter. These devices are specific to the helicopter as the are installed via the gas supply. If unsure which to purchase, contact the maker of your helicopter and get the needed parts from it.
Bring the helicopter to a certified helicopter mechanic to have the gas detectors installed. These are sensitive and sophisticated tools and must be installed by a trained professional. Helicopter maintenance is no place for an amateur.
Get training on how to use the gas detectors. Most mechanics and certified flight instructors have the knowledge to show by example how to use these crucial pieces of gear.
