The photoelectric liquid level
sensor/liquid
level switch can convert the changes of various liquid level parameters into standard current signals, which are transmitted to the operation control room for centralized display, alarm or automatic control by secondary instruments or computers. So what should the photoelectric liquid level switch do when the measurement is inaccurate? The problem of sensor misjudgment caused by liquid droplets after contact with liquid The photoelectric liquid level sensor contains a near-infrared light-emitting diode and a photosensitive receiver. The light from the LEDs is directed into a lens on top of the sensor. When the liquid immerses the lens of the photoelectric water level sensor, the light is refracted into the liquid, so that the receiver cannot receive or only a small amount of light. The photoelectric liquid level sensor senses this working condition change, and the receiver can drive the internal electrical switch, thereby starting the external alarm or control circuit. If there is no liquid, the light from the LED is reflected directly from the lens back to the receiver. According to the working principle of the photoelectric liquid level sensor, it can be known that liquid droplets will be generated after contact with the liquid, and the liquid droplets will cause the sensor to misjudge. The light will affect the final detection result, so it will lead to the wrong judgment of the sensor. It may be judged as a liquid state when the liquid level does not reach due to the influence of the liquid bead. The solution is detected by the liquid sensor building up on the surface, causing the signal output voltage to drop. Therefore, considering the influence of steam or liquid droplets, it is recommended to adjust the liquid level threshold voltage setting to solve this problem. When the page fluctuates, the liquid will continuously contact the sensor, which may cause the sensor to misjudge. So how to avoid this problem? Adding anti-shake logic to the program can avoid this phenomenon. The misjudgment of the liquid level sensor caused by direct sunlight The photoelectric liquid level sensor uses the optical reflection principle of infrared rays to measure the liquid level, and the infrared rays in the sunlight will interfere with the detection of the photoelectric i liquid level sensor. It is recommended to use a hood or change the installation method to solve this problem.
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