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Ultrasonic Level Sensor

2014-11-29 06:06  
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Ultrasonic Level Sensor Working Principle

Ultrasonic level sensoris one approach commonly used of the various types of measurement-level offered in the market today. However, there is some other very common method in the measurement of level, such as RF Capacitance, Radar, Conductance (conductivity), and Hydrostatic Head (tank gauging). Which method you choose, you need to understand the underlying theory and how each one works.

Level measurement using radio frequencies (RF) is a set of different configurations of the electrical characteristics of a capacitor. All types of this type use the frequency range from 30 KHz to 1MHz. An ultrasonic sensor consists of a transmitter and receiver, which operate using sound waves to determine the fluid level. As for the type of ultrasonic sensor (transmitter / receiver) using a range of 20-200 KHz, and the sonic type is a frequency of10 KHz.

The working principle of anultrasonic level sensoris to transmit sound waves from an ultrasonic transmitter to the surface of the liquid level to be measured. A piezoelectric crystal inside the transducer converts electrical pulses into sound energy moves in waves at a frequency that was established and at a constant speed in a particular medium. Echoes that reach the liquid surface will be reflected and returned and received by the transducer of an ultrasonic receiver.

The time taken by sound waves to return is directly proportional to the distance between the sensor and the piezoelectric material in the tank. Based on the measured time by the sensor is then used as the information to calculate the level of liquid in the tank.

Velocity of sound waves can sometimes be affected due to the proper temperature variation compensation should be provided in the sensor design. In general, the media on the surface of the fluid is air. However, one can use a blanket of nitrogen or steam as well.

Ultrasonic Level Sensor Transducer

Ultrasonic Level Sensor Transducer

Ultrasonic Level Sensor Installation

In the non-contact design, theultrasonic level sensoris located above the tank in such a way that sends sound waves in the form of bursts in the direction of the liquid in the tank down to below the measurement level. Immediately, after the sound wave hits the surface of the liquid is directed, the echo will be reflected and returned to the sensor.

Ultrasonic Level Sensor Installation

Ultrasonic Level Sensor Installation

Ultrasonic Level Sensor Circuit

Very varied types of ultrasonic fluid sensor current and with different methods of approach led to many design variations associated with theultrasonic level sensor. Here are some examples of such circuits that have different features or optional.

Ultrasonic Level-Sensor Circuit with LED Display

Ultrasonic Level-Sensor Circuit with LED Display

The following circuit is anultrasonic level sensorcomprising an ultrasonic transmitter and receiver circuit. This circuit was built using IC 555 and a transistor amplifier cascade as a high-gain amplifier in the receiver. Ultrasonic UMC40 transducer using a type-T (transmitter) and UMC40-R (Receiver)

Ultrasonic Liquid Level Indicator Circuit

Ultrasonic Liquid Level Indicator Circuit

The workings of the ultrasonic liquid level indicator circuit is when the liquid level is closing to the receiver’s head, the voltage meter’s deflection angle would be increasing. The closer to the liquid level, the bigger the corresponding deflection angle would be. Because the ultrasonic has the feature that it would not be effected by the liquid’s concentration and electric conductivity, so this circuit would be better and have higher accuracy than general contacting liquid level display circuit. Seekic.com

Such a glimpse of the level measurement concerning the workings, installation, and the circuit, you might be interested with it. Many other online resources that it can be used as a reference for learning more about theultrasonic level sensor.


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