This device uses a new method to detect water level - photoelectric reflection method. The sensor uses infrared emitting and receiving diodes, and through the anti-interference circuit, it effectively suppresses background light interference and electromagnetic wave interference; the amplification and rectification circuits are used to enhance weak signals, and the hysteresis comparator is used to obtain a stable control signal at the output end. Tests have shown that it is a pollution-free, high-precision, and good control effect liquid level measurement and control device. Keywords: photoelectric; detection; interference
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