Index parameters of ultrasonic level meter

Ultrasonic level meter is a commonly used level meter, widely used in mining, power plants, chemical plants, water treatment plants, sewage treatment stations, agricultural water, environmental monitoring and other fields. The main indicators of the ultrasonic level meter are introduced in detail below. The main indicators of the ultrasonic level meter 1. The range represents the maximum range that the ultrasonic level meter can measure, which reflects the sensitivity of the transducer. The larger the range, the higher the sensitivity. The ultrasonic level meter can be equipped with transducers with different ranges such as 4, 6, 8, 10, 20, 30m. When the ultrasonic attenuation is fast and the interface reflection is poor, in order to prevent the ultrasonic signal received by the ultrasonic probe from being too weak and indistinguishable from the noise signal, it is necessary to increase the transmitting power of the transducer. 2. The blind zone is also called the dead zone, which is a distance that cannot be measured by the ultrasonic level gauge. When the ultrasonic level meter emits ultrasonic pulses, it cannot detect the reflected echo 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 transmitted, the reflected echo cannot be detected during the period, so a small distance from the probe surface downward cannot be detected normally, and this distance is called the blind zone. For products of the same range, the smaller the blind zone, the better the design of the transducer. 3. The normal temperature range is -10~60 degrees Celsius. Although the limit operating temperature of piezoelectric ceramics is generally 150 degrees Celsius, most materials in the manufacturing process of ultrasonic level gauges cannot work at temperatures above 100 degrees Celsius for a long time. 4. The accuracy is mainly affected by temperature changes. In order to ensure the measurement accuracy, most ultrasonic level gauges are equipped with temperature compensation function. In addition, changes in the gas composition will also affect the accuracy of the ultrasonic level meter. For example, some volatile liquids will cause changes in the air composition after volatilization, resulting in changes in the sound speed of the gas, causing measurement errors. Most manufacturers can control the accuracy within 0.5% under normal temperature and pressure and without external environment interference. 5. The power supply (DC24v) and the signal output (DC4-20mA) of the two-wire and three-wire ultrasonic level meters share a circuit, that is, only two wires are used. The disadvantage is that the transmit power is relatively small. weaker. The three-wire ultrasonic level meter is actually a four-wire system. The power supply (DC24v) and the signal output (DC4-20mA) loop are separated, and each uses two wires. When their negative ends are connected to the ground, usually three wires are used. , its advantage is that the transmit power is larger.

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