Ultrasonic level gauge is a very practical measuring instrument, its metering performance is very good. There are many types of ultrasonic level gauges on the market today, and different ultrasonic level gauges have different characteristics. The ultrasonic level meter is a high-frequency pulse sound wave emitted by the ultrasonic transducer (probe). When the surface of the measured object (material) is reflected and folded back, the reflected echo is received by the transducer and converted into an electrical signal. The propagation time of the sound wave is proportional to the distance from the sound wave to the surface of the object. The relationship between the acoustic wave transmission distance S and the sound velocity C and the acoustic transmission time T can be expressed by the formula: S=C×T/2. Since the mechanical inertia in the sound wave pulse emission process occupies the transmission time, the sound wave in a small area close to the ultrasonic transducer This area that cannot be received is called a dead zone. The size of the blind spot is related to the range of the ultrasound. When the ultrasonic level gauge emits an ultrasonic pulse, the reflected echo cannot be detected at the same time. Since the transmitted ultrasonic pulse has a certain time width, and the sensor still has residual vibration after the ultrasonic wave is emitted, the reflected echo cannot be detected during the period, so a small distance from the probe surface downward cannot be detected normally, and the distance is called a blind zone. If the highest level being measured enters the blind spot, the meter will not be detected correctly and an error will occur. If necessary, you can increase the level gauge installation. Ultrasonic level gauge features: 1. Its measurement accuracy is very high, ultrasonic level gauge uses high intelligence technology, can make its measurement accuracy to a few tenths of a percent, can resist various kinds of measurements Interference wave; 2. The performance of the ultrasonic level gauge is very stable. When designing the circuit, it will use high-quality isolation modules and other components from the power supply. The performance of these components is very stable; The waterproof level of the ultrasonic level gauge is relatively high, and the appearance looks more beautiful and safe. It is mainly made of aluminum-gold casing and has good explosion-proof performance. 4. The use of ultrasonic level gauge is relatively frequent and will not There are a lot of faults, it is very convenient to install, and it is very well maintained. Users only need to follow the user manual to install and debug. The ultrasonic level gauge is a non-contact meter that does not come into direct contact with liquid and has a low failure rate. At the same time, when the instrument is installed, there is no need to clear the tank and it will not affect the normal operation of the production. Built-in temperature compensation, power adaptive, using a number of self-developed patented technology, with a new signal processing technology, greatly improving the measurement accuracy of the instrument, the interference echo has a significant suppression function. The ultrasonic level gauge is made of metal-aluminum alloy die-cast housing, which has a beautiful appearance and good protection. The instrument uses industrial isolated power supply, and all input and output lines have lightning protection, overvoltage and overcurrent protection circuits. It is widely used in the measurement of materials in petroleum, chemical, water treatment, water conservancy, food, food and other industries. It has the characteristics of safety, cleanness, high precision, long life, stable and reliable, convenient installation and maintenance, and simple reading. The blind zone of the ultrasonic level gauge differs depending on the range and the blind zone. If the range is small, the blind zone is small and the range is large, and the blind zone is large. But generally they are between 30cm-50cm. Therefore, the blind zone must be considered when installing the ultrasonic level gauge. In special occasions, the blind zone will be required to be small. At this time, the small blind zone ultrasonic level gauge can be considered, and the blind zone is generally only 4-6 cm. However, its range is small, only 0.6m. In many areas of liquid level measurement, because of space constraints and installation conditions, ultrasonic level gauges with small dead zones are required.
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