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Industry Information
Ultrasonic level gauge for level measurement of volatile liquids in closed containers
2012-3-15 8:40:03

通常应用于温度在-40℃~100℃之间、压力在3Bar(5kg/cm2)以下的场所进行液位或料位的测量。 Ultrasonic liquid level gauge is usually applied to the measurement of liquid level or material level in places with temperature between -40 ℃ ~ 100 ℃ and pressure below 3Bar (5kg / cm2). In the case of normal temperature and pressure, the ultrasonic liquid level gauge is the best choice to measure the liquid level. It has the characteristics of reliable operation, easy installation, long service life, maintenance-free, and has a relative price advantage. Because the ultrasonic level gauge does not contact the measured medium when measuring the material level, and has a fully enclosed and anticorrosive structure, it is the best for liquid level measurement of various liquids such as viscous, corrosive and turbid.

对于密闭容器内的挥发性的液体的液位测量,应注意容器内气体声速可能与空气中的声速不同,如液位计不能对声速进行修正,则会出现一定的误差;挥发性的液体会在超声波液位计探头表面凝结,阻挡声波的收发,要求液位计具有可变功率控制功能。 For the ultrasonic level gauge for volatile liquid level measurement in a closed container, it should be noted that the sound velocity of the gas in the container may be different from the sound velocity in the air. If the level gauge cannot correct the sound velocity, a certain error will occur; volatilization The liquid will condense on the surface of the ultrasonic level gauge probe, blocking the transmission and reception of sound waves. It is required that the level gauge has a variable power control function. It is feasible to use ultrasonic level gauge for material level measurement, with sufficient application experience and successful examples. When measuring the material level, the installation position should be selected, and the material level should be relatively flat. For the powdery material level, a level gauge with greater power (range) can be selected for measurement. For liquids with sharp fluctuations in the liquid level, use an ultrasonic level gauge with automatic power control; use a larger range ultrasonic level gauge; add a plastic tube to the liquid to measure the liquid level in the plastic tube


安装时,变送器探头必须高出最高液位50公分左右。 When the ultrasonic level gauge is installed, the transmitter probe must be about 50 cm above the maximum liquid level. Only in this way can the accurate monitoring of the liquid level and the safety of the ultrasonic level gauge be ensured. In actual use, due to inadequate consideration during installation, the level gauge is flooded with water, causing the level gauge to be completely damaged. Features: low price, small size, light weight, can be used in food, chemical, semiconductor and other industries for liquid and bulk solid non-disconnected level measurement, can be used for remote level monitoring and pump control machinery installation should pay attention to: installation It should be perpendicular to the surface of the object to be measured. Avoid using it to measure foamy objects. Avoid installing it at a distance less than the blind area from the surface of the object (blind area: there will be a standard for each product, as known by the product). The blocking material does not meet the nozzle and the container wall. When detecting large solid objects, the orientation of the probe should be adjusted to reduce measurement errors. When the ultrasonic level gauge works, high-frequency pulse sound waves are emitted by the transducer (probe). ) The surface is reflected, and the reflected reflection echo is received by the same transducer (probe) and converted into an electrical signal. The time between the sending and receiving of pulses (moving time of the sound wave) is proportional to the distance from the transducer to the surface of the object. The relationship between the distance S of the sound wave transmission and the speed of sound C and the time T can be expressed by the formula: S = CT / 2 Installation of ultrasonic liquid level timer must consider the blind spot problem of ultrasonic liquid level meter. When the liquid level enters the dead zone, the ultrasonic transmitter cannot measure the liquid level, so when determining the range of the ultrasonic level meter, a margin of 50 cm must be left.