What is an Ultrasonic Level Gauge
What is an Ultrasonic Level Gauge? Ultrasonic surface sensor using ultrasonic method is a non-contact surface measurement method. The sensors emit sound frequency waves in the range of 20 kHz to 200 kHz, which are reflected from the liquid surface and detected by the emitting transducer. Ultrasonic surface sensors can be affected by factors such as humidity, temperature and pressures (due to changes in sound speed). To overcome this, correction factors are used to measure the surface to improve measurement accuracy.
Figure: Simple diagram to show an ultrasonic level measurement system
It is important to install an ultrasonic transducer to ensure the best response to reflective transmissions. In addition, the tank should be relatively free of obstacles such as brackets or ladders to minimize false returns. A major disadvantage of ultrasonic tank sensing systems is that they are prone to rusting. This occurs when the transmitted signal returns from an unwanted surface to the surface of the transducer, ie another surface other than the liquid in the tank. Rusting can be compensated for and in many cases minimized so that it has little effect on measurement accuracy.
Another drawback is that it is widely accepted in the industry that contactless ultrasonic devices can be mistaken for use in vacuum-potassium nitrogen storage tanks. Accuracy can be improved by having a fixed reference point in the tank, and instead, continuously controlling surface changes according to this fixed point. This tank level measurement system is relatively inexpensive compared to alternative systems that have comparable accuracy.
This level measurement method is widely seen as inaccurate. This is due to the effect of gasoline vapor on the measurement. Both system manufacturers and system solution designers and installers have stated that this technology should not be used on gasoline or fuel storage tanks .
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