This is the first item's accordion body. Daihatsu MD-SX Controller Oil Mist Detector This equipment consists of plural sensor units, inserted into crankcase side wall of each cylinder on diesel engine, and an integrated controller which controls sensors units by the communication link. Sensor units is compactly designed to detect oil mist by the natural diffusion system without air suction mechanism by moving parts like a fan, driving air and piping, as well as realizes improved reliability and easy maintenance. Controller constantly monitors the oil mist density in the crankcase and indicates the oil mist level. Additionally it will indicate status with alarm in case the oil mist density will be increased over normal level by overheated bearing, etc., so can realize early detecting and reasonable precaution for the serious accident in low-, medium- and high-speed diesel engines.