的盲区：超声波物位计在发射超声波脉冲时，不能同时检测反射回波。 Blind zone of ultrasonic level meter: When transmitting ultrasonic pulse, ultrasonic level meter cannot detect reflected echo at the same time. Because the transmitted ultrasonic pulse has a certain time width and the sensor still has aftershock after transmitting the ultrasonic wave, the reflected echo cannot be detected during the period. Therefore, a short distance from the probe surface downward cannot be detected normally. This distance is called the blind zone. If the measured highest level enters the blind zone, the meter will not be able to detect it correctly and errors will occur. If necessary, the level gauge can be installed higher.
The dead zone of the ultrasonic level gauge is different depending on the measuring range. The smaller the range, the smaller the blind zone, and the larger the range, the larger the blind zone. But generally it is between 30cm-50cm. Therefore, the blind spot must be considered when installing the ultrasonic level gauge. In special occasions, the blind zone is required to be small. At this time, a small blind zone ultrasonic level gauge can be considered, and the blind zone is generally only 4-6cm. But its range is very small, only 0.6m. In many areas of liquid level measurement, because of space constraints and installation conditions, ultrasonic level gauges with small blind spots are required. Market demand, ultrasonic level gauge and level gauge supplied by Anhui Secco Environmental Technology will meet your requirements.
的工作原理，是根据超声波的发射和接收来实现的。 The working principle of the ultrasonic level gauge is based on the transmission and reception of ultrasonic waves. The transmission speed of ultrasonic waves in the air is constant. The ultrasonic waves are emitted, and then the waves reflected from the liquid surface or the object surface are received, and the timing is controlled from the start of transmission to the end of receiving the echo. The timing of the transmission of ultrasonic waves in the air is determined. Distance L = speed (S) * time (T), because it is a round trip, the actual distance is half the distance L. The depth of the tank or the height of the tank is constant. The actual liquid level is the depth of the tank minus the distance measured by the ultrasonic wave, which is the height of the liquid level or the material level. As a result, ultrasonic or liquid level measurement is achieved.
Characteristics, working principle and technical parameters of ultrasonic level gauge (provided by Jinhu Dongxiang Instrument Technology Department 0517-86900921)
Ultrasonic level gauges play an increasingly important role in daily production. It is increasingly used in various industries. Let ’s take a look at the characteristics, working principles and technical parameters of the ultrasonic level gauge.
The working principle of the ultrasonic level meter is that the ultrasonic transducer (probe) sends out high-frequency pulse sound waves that are reflected on the surface of the measured level (material) and are reflected back. The reflected echo is received by the transducer and converted into an electric signal. It is proportional to the distance from the sound wave to the surface of the object. The relationship between the sound wave transmission distance S, the sound speed C and the sound transmission time T can be expressed by the formula: S = C × T / 2. The transmission time is occupied by the mechanical inertia during the sound wave pulse emission The acoustic wave can not be received in a small area near the ultrasonic transducer. This area is called a blind zone. The size of the blind zone is related to the ultrasonic range.
的特性 Characteristics of ultrasonic level gauge
1. Select a professional ultrasonic small-angle probe, with high transmission power, high sensitivity, long life, and long measurement distance; 2. Set the upper and lower limits of any point, set the reciprocal value, (can be arbitrarily set between two points in the range of the measurement The distance corresponds to 4-20MA or 0-5V, and the sensor can be easily installed and debugged to meet various signal connection requirements). Distance accuracy online calibration can be used for water, alcohol, sugar, beverage and other liquid level control. 3. The output mode has 4--20MA or 0-5V output, and 0-10V output. Digital signal: RS232 (three wires) / RS485 (optional one, agreed upon ordering) The secondary indicator is an intelligent digital display instrument with multiple functions, of which the upper and lower limit setting function can realize the liquid level and material level. Automatic control and alarm. 4. The distance or depth data is directly displayed by the LED digital tube, which is convenient for on-site measurement and has temperature display. 5. Fully enclosed design, can be used in the field, and the liquid can be directly measured. 6.High cost performance and low price