Currently, single-point liquid level detection solutions are commonly used: for metal water tanks, reed pipe float switches are usually used. For non-metallic water tanks, low-cost magnetic float switches are generally used. However, the application scenarios of these two liquid level detection products have certain limitations and principle defects: the float switch is a mechanical structure and cannot be used normally in sewage, hard water, moss and corrosive liquid environments, and has certain requirements for water quality.

In addition, the biggest use failure of the reed pipe float switch is that it is easy to corrode, wear, and foreign matter get stuck, which affects the accuracy and reliability of the measurement. Secondly, it has high installation requirements, is greatly affected by the magnetic field, and has defects such as fragile glass tubes, resulting in detection failure. The biggest use failure of the magnetic float switch is also caused by contamination by liquid impurities, dirt, oil, etc., resulting in detection failure, and the high magnetic ring cannot be used. So, in view of the common defects of reed switch floats and magnetic floats, in the current intelligent trend and the home appliance industry with the largest usage, how can the liquid level detection sensor solution be stable, reliable, environmentally friendly, easy to install, and within the acceptable cost range in the market?

Aibaolai have developed an ultrasonic point level switch sensor (3003U01-281) that is not limited by water quality. It can not only be used in a variety of liquid media, such as mixed coffee powder water, detergent water, sewage and beverage liquid, but also has the characteristics of high reliability, high response speed, easy installation and low cost. Regardless of the liquid situation, the sensor can accurately detect the liquid level information, provide users with reliable data support, and completely solve the pain points and difficulties of the float switch.

Its working principle: The signal attenuation of high-frequency ultrasonic signals in air and liquid is quite different, and it will almost attenuate to 0 in air. By designing a circuit, the closed loop of the circuit is constructed by ultrasonic signals. The circuit has output when the loop is closed and no output when the loop is open. The presence or absence of output corresponds to whether the ultrasonic transmission path is filled with liquid, and the corresponding achievable detection includes point liquid level, whether there is liquid medium in the pipeline, etc. In the liquid level detection scenario, the ultrasonic sensor head is placed at the height of the side wall of the water tank to be detected. When there is a liquid medium, the output is high. When the sensor detects air, there is no output。

3003U01-281 product features

· Switching sensor, no calibration required

· No consumables, long service life

· Regardless of water quality, it is suitable for a variety of liquids: mixed coffee powder water, detergent water, purified water, mineral water, sewage, juice, etc.

· Reed switch float switch replacement, cost-effective

· Can work in high magnetic field environment and has strong anti-interference ability

· Compact and beautiful, easy to install, no need for complicated wiring connections

· Not affected by dirt: the product works normally in a dirt environment

· No matter the water tank material: metal, plastic, and glass can be used

· Passed high concentration salt water and 100,000 working tests.