The sensor must be mounted as close as possible to vertical so the sensor can read accurately.
The sensor emits an ultrasonic beam that reflects off the surface of liquid.
If the sensor is set at an angle to the surface, the reflected pulse will not reach
the receiver directly and either an innaccurate or no measurement will be recorded.
The beam emitted is conical in shape. This means that some space must be given
between the wall of the tank and the sensor, otherwise the tank wall will interfere with the reading.
If you have a corrugated roof, we recommend mounting on the peak of a corrugation.