Ultrasonic level meter is a kind of measuring tool often used in industrial production, which has many advantages, such as wider measuring range, high accuracy of measuring value, sensitive measuring response, fast response frequency and so on. It is widely used in many industrial fields. When we use ultrasonic level transmitter will find that it has a certain use of blind spots, recognize these blind spots in order to more effectively use the ultrasonic level meter.

Ultrasonic level meter is the use of ultrasonic transducer (probe) on the device emits high-frequency pulses of sound waves, when it meets with the measured level (material) surface, converted by the transducer into an electrical signal, showing the level data. The time of propagation of the acoustic signal is proportional to the distance from the acoustic source to the surface of the liquid level. The relationship between the acoustic wave transmission distance S, the acoustic wave velocity C and the acoustic wave transmission time T, can be expressed by the formula: S = C * T / 2. During the transmission of an acoustic pulse, a small area near the ultrasonic transducer cannot receive the acoustic wave because mechanical inertia occupies the transmission time, which is called the blind zone. The size of the blind zone is related to the measuring distance of the ultrasound.

Ultrasonic level meter in industrial production is a more practical measurement instrument, compared with the traditional level meter, its measurement, digital display and other performance is more outstanding. At present, there are many types of ultrasonic level meters on the market, and different ultrasonic level sensors have different characteristics. We should understand the blind spot, in the selection of the time will be in accordance with the actual production needs ratios, will not cause waste to increase production costs.

We first understand the characteristics of the ultrasonic level meter: 1. It is high precision measurement values, ultrasonic level meter using highly sensitive intelligent integration technology, which can make its measurement accuracy of zero percent, to resist the measurement of a variety of natural interference waves; 2. Ultrasonic level meter performance is very stable in the design of circuits, it uses high-quality isolation modules and other components, the components of these components have a high level of technical content Ultrasonic level meter has high waterproof grade, beautiful appearance, safety, high resistance to external environment, the shell material is aluminum alloy, with good anti-explosion performance; 4. Ultrasonic level meter is more durable, there will not be a lot of failures, installation is very convenient, maintenance is also very good, the user only need to check the user manual can be installed and debugged!

Ultrasonic level meter is a kind of non-direct contact liquid level instrument, not in direct contact with the liquid in the tower, irrigation, so there is no liquid erosion and so on, low failure rate. At the same time, when installing the meter, there is no need to clean up the tower, tanks, etc., and it is installed directly outside in a good location of choice, without affecting industrial production. Ultrasonic level transmitter internal temperature compensation, adaptive power supply power, signal processing using new technologies, greatly improving the measurement accuracy of the instrument, can better cope with the interference echo. Ultrasonic level meter plate selected aluminum alloy material, beautiful appearance, has a very good protection ability. The instrument adopts industrial isolated power supply, and all input and output lines have lightning protection, over-voltage and over-current protection circuits. It has good performance in petroleum field, chemical field, water treatment, water conservancy, food, grain and oil, etc. It is characterized by safety, no pollution, high numerical accuracy, long service life, stable operation, convenient operation and maintenance, and quick reading.

Regarding the blind zone in the use of ultrasonic level gauge, it depends on the different measurement distance, the size of the blind zone is also different. If the measuring distance is small, the blind zone is small; if the measuring distance is large, the blind zone is large. The general range of blind zones is between 30-50 centimeters. So generally in the installation of ultrasonic level gauge must consider the blind spot. In special industrial scenarios, you need to ensure a smaller blind zone, in this case you can consider choosing a product with a small blind zone, such as the blind zone in 4-6 cm, measuring distance of 0.6 ultrasonic level meter. Remember that the blind spot is small, the measurement distance is small, you can choose in accordance with the actual industrial measurement needs, but also need to consider the field of measurement, the installation of space with or without restrictions, the use of external environment and other factors.

Ultrasonic level meter in the transmission of ultrasonic pulses, but also can not do the same time to receive the reflected echo. It takes some time after the pulse is transmitted, and the sensor still has the characteristic of aftershock, so the reflected echo cannot be detected during this cycle, and therefore cannot be detected normally at a short distance from the bottom of the probe surface. This distance is called the blind zone. If a higher object is measured into the blind zone, it will not be detected correctly by the instrument and an error will occur. If necessary, the level gauge can be raised.