How should the ultrasonic measurement range and installation height be understood?
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Is there a mistake written here? 1. Why isn’t it H-Hmax≥Lmin above? H-Installation height ； At this point, the distance between the ultrasonic sensor’s installation height and the liquid level is at its minimum. Should it be greater than the minimum measurement range (within that minimum range)? 2. Why isn’t it H-Hmin≤Lmax above? At this point, the distance between the ultrasonic sensor’s installation height and the liquid level is at its maximum; should it be less than the maximum measurement range (within that maximum range)?
There is indeed some confusion in the wording. The correct understanding is as follows: 1. When discussing “H-Hmax≥Lmin”, it means that at the highest liquid level in the container (i.e., Hmax), the distance from the ultrasonic sensor to the liquid surface should be greater than or equal to the sensor’s minimum measurement range (Lmin). This is to ensure that the sensor can still function properly even at the highest liquid level, without exceeding its lower measurement limit due to being too close. 2. When discussing “H-Hmin≤Lmax”, it means that at the lowest liquid level in the container (i.e., Hmin), the distance from the ultrasonic sensor to the liquid surface should be less than or equal to the sensor’s maximum measurement range (Lmax). This is to ensure that even when the liquid level is at its lowest, the sensor can still cover the liquid surface and will not fail to detect it due to being too far away. In summary, it is necessary to ensure that the installation height of the ultrasonic measuring equipment is appropriate, so as to enable effective monitoring across the entire range of liquid level changes. .