BEP Contour Matrix Gas Detector w/Control [600-GDL]Contour Matrix Gas Detector with Control The Contour Matrix Gas Detectors are the product of continuing research and development which BEP Marine Ltd devotes to their product range. The BEP Detectors use microprocessor control to ensure correct sensor sensitivity. The Detectors have the capability to control two sensors that detect both LPG and Petrol, with visual and audible alarms. There is a test switch to check the operation of sensors with