Principle of Measurement
The sensor is positioned at the top of the inspection chamber. An ultrasonic signal is emitted towards the surface of the wastewater inside the chamber (or the bench). This signal is reflected by the surface, and the echo returns to the sensor. The travel time of the ultrasonic pulse is calculated, which allows determining the current level of wastewater in the chamber.
Recommendations
The ultrasonic sensor has two blind spots, as shown in the figure below. This means the sensor cannot perform accurate measurements in these areas. The first zone extends from 0 to 30 cm, and the second extends beyond 500 cm.
Ultrasonic sensors use the propagation of ultrasonic waves to calculate the distance between the sensor and the first liquid surface. To obtain accurate measurements, the sensors must be installed at the top of the chamber so that the ultrasonic wave is emitted vertically, without any interference.
Objectives of installing a "Black Point" Probe:
*TO BE EFFECTIVE, THE INSTALLATION OF A "BLACK POINT" PROBE MUST BE SUPPORTED BY RAINFALL DATA.
Alert strategy for black points: Multiple configurations possible.
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