The Oil Streak Sensor is designed to detect oil traces in the air tube, down to 5mm3/min. The product has been designed using a master and slave concept. The master sensor, while monitoring a single tail tube, also incorporates a 4-segment LED display, 3 soft keys for programming and configuring, and an M12 electrical connector for power supply and fault alarm output. The slave sensors may be piggybacked to the master sensor, up to a maximum of 3, or may be remotely connected via an interconnecting cable. One slave sensor can monitor one tail tube. The sensors are designed for either 4mm or 6mm tube.