Small blind area ultrasonic level meter
Why are more and more users paying attention to small blind spot ultrasonic level meters ? Special attention should be paid to small blind spot ultrasonic level meters when measuring small range liquid levels. If the liquid level is higher than the blind spot, the signal will be inaccurate, resulting in inaccurate liquid level. The blind spot of ultrasonic level meters is like the blind spot of human eyes. When an object is close to the eyes and at a certain angle, it is not clear or can not be seen. This range is called the blind spot.
Working principle of ultrasonic level meter:
Ultrasonic level meters emit sound waves, which travel at the same speed in the air. When they encounter liquid, the sound waves will be reflected back and received by the receiver. The wave speed is multiplied by the propagation time, so the distance to the liquid surface is divided by 2. The liquid level is the depth of the pool minus the distance measured by the ultrasonic level meter, which is the height of the liquid level or material level. Ultrasonic level meters are composed of a sounder and a receiver.
The blind area of ultrasonic level meter varies according to the range. The smaller the range, the smaller the blind area, and the larger the range, the larger the blind area. But it is generally between 30cm-50cm. Therefore, the blind area must be taken into consideration when installing ultrasonic level meter. In special occasions, the blind area is required to be very small. At this time, small blind area ultrasonic level meter can be considered, and its blind area is generally only 4-6cm. But its range is also relatively small, only 0.6m. In many fields of liquid level measurement, due to space limitations and installation conditions, small blind area ultrasonic level meter with very small blind area is required.
When the liquid level of an ultrasonic level meter enters the blind area, it will usually display the liquid level position corresponding to the secondary echo. For example, if the blind area is 0.3m and the distance from the liquid surface to the surface of the transducer (or probe) is 0.2m, the ultrasonic level meter will display the liquid level value corresponding to the spatial distance of 0.4m. Because the liquid surface reflects well when measuring the liquid level, the sound pulse emitted by the ultrasonic level meter will be reflected by the liquid surface, and the echo will be reflected back to the liquid surface after reaching the surface of the transducer (or probe), and will be reflected back to the transducer and received again. The echo at this time is the secondary echo. If the reflection conditions are good, multiple echoes (multiple round-trip echoes) may be received, so the liquid level will be inaccurate at that time.
At this time, the ultrasonic level meter with small blind area is particularly important. The ultrasonic level meter with small blind area developed and produced by Meacon is at the leading level in the market. The specific blind area varies according to the range of the ultrasonic level meter . The different wavelengths emitted by the ultrasonic level meter also affect the effect of the blind area. The wavelength and wave penetration are also different. When selecting, you should pay attention to the specific conditions of the customer's site. Meacon is a good choice for the ultrasonic level meter with small blind area, and the selection engineer is also very professional.
