Liquid surfaces are not perfectly flat, therefore perfect reflection of the waves cannot be obtained. The linear output cannot reach its maximum value.

To use the Sensor at its maximum sensing distance (e.g., when the sensing range of the E4PA-LS400-M1, is 500 to 4,000 mm, the maximum sensing distance is 4,000 mm), the sensing surface must be perfectly flat and the waves must be vertical. Keep this in mind when positioning the Sensor.