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 which detect both LPG and Petrol, with visual and audible alarms. There is a test switch to check operation of sensors with indicators for fault detection. 600-GDRV Gas Detector uses the same sensor as the 600-GD and GDL. The sensor is mounted in the front fascia creating a stand alone unit. the unit is designed to be surface mounted at the lowest point in the vehicle. The detector is equiped with a test button and a sensor status light.