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Side 60
Ultrasonic Level Meter
Operation Manual
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How to judge the fault causes at site according to echo pattern
The ultrasonic level gauge has a function that it can show the ultrasonic
wave form reflected from the site, so that the fault causes at site can be roughly
judged according to the shape of echo. Now, please allow me to explain it in
details.
Enter echo pattern: press the
↑
button and hold on, and then press the
Set button and hold on for 3s, an echo pattern will appear.
Exit echo pattern: press the
↓
button and hold on, and then press the Set
button and hold on for 3s, the echo pattern will disappear.
I. Resonance
When the probe is connected with a metal support or flange, the unceasing
vibration of probe will be transmitted to the metal flange and then reflected by
the metal flange back and accumulated on the probe, forming a strong echoed
signal. As a result, a condition that the water level of the pond is 3m but the
ultrasonic level gauge shows nearly full measuring range appears.
Fig. 1 Echo Signals Caused by Resonance
In the echo pattern, echo close to the left is the echo close to the probe,
while the echo close to the right is the echo away from the probe.
The figure on the left is an ultrasonic echo picture taken at site and the
figure on the right is a comparison graph. The echo in the frame I marked in
the right figure is caused by the resonance between probe and metal support.
Although the wave caused by resonance is fixed and the reflected waves on the
right are very clear, the ultrasonic level gauge often shows the pool is full
because the strength and width of the reflected waves on the right can not be
compared with the wave caused by resonance.
