External ultrasonic level gauge

The external ultrasonic level gauge, as the name suggests, the external type is because the ultrasonic level gauge does not need to open the hole, the probe is placed outside the pipe and does not directly contact the medium, because many level gauges need to directly contact the medium, so many working conditions are more complicated. There are also some working conditions that require stricter hygiene conditions, such as the milk industry, which cannot be used with these level gauges that directly contact the medium. Therefore, external ultrasonic level gauges are widely used in industries with relatively special working conditions. Of course, the external ultrasonic level gauge does not mean that it can only be applied to these complicated working conditions. It can be applied to various working conditions, except for the gas industry. Then some people will ask, what is an external ultrasonic level gauge Well, which occasions is it suitable for? So today I will tell you what is an external ultrasonic level gauge. Principle: The external ultrasonic level meter is a high-frequency pulse sound wave emitted by an ultrasonic transducer (probe) when it encounters the surface of the measured level (material) and is reflected and folded back. The reflected echo is received by the transducer and converted into an electric signal. Acoustic wave The propagation time is proportional to the distance from the sound wave to the surface of the object. The relationship between the sound wave transmission distance S and the sound speed C and the sound transmission time T can be expressed by the formula: Su003dC×T/2. The probe part emits ultrasonic waves, and then is surfaced by the liquid Reflect, the probe part is received again, the distance from the probe to the liquid (object) surface is proportional to the elapsed time of the ultrasonic wave: 　　hb u003d CT2, that is, distance [m] u003d time × speed of sound/2 [m] 　　 speed of sound temperature compensation formula: ambient sound speed u003d 331.5 + 0.6×Temperature structure: The external ultrasonic level gauge is composed of three parts: ultrasonic transducer, processing unit, and output unit.　　 Application features: 1. No mechanical moving parts, high reliability, simple and convenient installation, non-contact measurement, and not affected by liquid viscosity, density, etc. The accuracy is relatively low.　　 2. Use polypropylene waterproof shell. The shell is small and very strong, and has excellent chemical resistance. For inorganic compounds, no matter acid, alkali, salt solution, except for strong oxidizing materials, there is almost no destructive effect on it, and it has no destructive effect on almost all solvents at room temperature. Insoluble, it can be used on alkane, hydrocarbon, alcohol, phenol, aldehyde, ketone and other media.　　3. Light weight, no scaling, no pollution to the medium.　　 4. Non-toxic. It can be used for the installation of equipment in the pharmaceutical and food industries, and the maintenance is extremely convenient. Through the above introduction of the external ultrasonic level gauge for everyone, I must have a clear understanding of the external ultrasonic level gauge. Since the ultrasonic level gauge has so many performance characteristics, can it be applied to all working conditions? This is not the case. Although the ultrasonic level gauge does not need to directly contact the medium, it also has its limitations.　　 1. There should be no obstacles under the sound wave. Ultrasonic level gauge is a sound wave reflection principle. Obstacles will affect ultrasonic emission and cause signal loss; 　　2. 2. Ultrasonic level gauge test is prone to blind spots; 　　3. It is not suitable to measure pressure vessels. Pressure mainly affects the probe, and there is also a certain relationship between pressure and temperature, Tu003dKP (K is a constant), so the change of pressure affects the change of temperature, which in turn affects the change of sound velocity; 　　 4. In actual measurement, Temperature can also cause measurement errors, and changes in temperature can cause changes in the speed of sound. Advanced measurement system, including temperature sensor and system functions, can automatically compensate for the influence of temperature. In practical applications, because the surrounding environment of the probe is different from the temperature of the measured medium, the measurement system will select the temperature sensor combined with the probe and the external temperature sensor separated from the probe for temperature compensation; 　　 5. Dust is an ultrasonic level gauge The one with greater impact in the measurement. The dust environment has a very small impact on the speed of sound, but the attenuation of the sound wave is very obvious, so it is best not to use it in this situation; 　　 6. Medium with water mist and a large amount of foam, The ultrasonic level gauge cannot be used in the occasion of volatile medium, it is easy to absorb the sound wave or interfere with the sound wave emission, and the signal is lost and the accuracy is reduced. Therefore, everyone must have a good understanding of their working conditions when purchasing, otherwise the external ultrasonic level gauge that you bought will not be used. Not only will the money be wasted in vain, but it will also affect the industrial production, which will not pay for it. . Kaidi is a professional manufacturer of external ultrasonic level gauges. If you have any questions about external ultrasonic level gauges, you can consult Kaidi’s online customer service or call Kaidi’s consultation hotline.
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