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Side 61
Ultrasonic Level Meter
Operation Manual
Fig. 2 Echo Signals after Resonance Problem Solved
After the resonance problem is solved, the echo close to the left is
obviously narrower than that shown in Fig. 1 and the real echo can be
recognized by the ultrasonic level gauge then.
II. Liquid enters the blind area of ultrasonic level gauge
Fig. 3 Echo Pattern after Liquid Enters Blind Area
The ultrasonic level gauge has a blind area at the position near the
emitting surface of probe. The blind area will increase with the increase of
effective measuring distance. For example, the ultrasonic level gauge with a
measuring range of 5m has a 0.50m blind area at 20
℃
.
The echo enclosed by the red frame in figure above is the high-intensity
echo caused by blind area and the echo enclosed by red circle is normal echo
signal. Due to strong echo caused by blind area, the real echo signals on the
right are covered and the measured water level data may be any values. Seeing
carefully, you may find that the echo in blind area is similar to the echo caused
by resonance in Fig. 1.
After we raise the installation position of probe to make the distance from
the highest water level to the emitting surface of probe be greater than 0.50
(blind area), we find that the echo close to probe on the left changes.
