SINGLE SENSOR ALARM – PETROL WG100-P Ocean Safety offer a range of alarm systems for detecting petrol vapour. These systems use modern technology to provide unrivalled protection, the alarm system incorporates a unique waterproof sensor. Petrol vapour is often used as a fuel for inboard and outboard engines of boats, tenders and RIBs. Petrol is very volatile and easily ignited. A small leak of petrol can therefore quickly lead to a very dangerous situation. If the petrol vapour is allowed to build up in a confined space and ignition occurs an explosion will result.