| 摘要 |
PROBLEM TO BE SOLVED: To provide a detector capable of correctly detecting mixing of water or air into fuel oil which will be supplied by a measuring apparatus for supporting a case in which water or air is mixed into fuel oil from a side nearer to the measuring apparatus than an underground tank.SOLUTION: An ultrasonic transmission device (1) emitting ultrasonic waves (Ws) and an ultrasonic receiver (2) receiving the ultrasonic waves (Ws) are provided in an oil supply circuit (3). |
