The Schaller 153020 is a genuine replacement sensor unit, also known as a measuring head, designed for the Schaller VISATRON Oil Mist Detection (OMD) systems. This critical component is engineered to precisely measure the opacity of the atmosphere within an engine’s crankcase. By detecting the earliest signs of oil mist, which can indicate serious engine issues like piston or bearing overheating, the 153020 sensor unit plays a vital role in preventing catastrophic engine damage and potential explosions. It is built to withstand the harsh conditions of an engine room and ensures the reliable and continuous operation of your safety monitoring system. This unit is a direct replacement for the measuring head on VISATRON VN 87 plus series systems.