The auto hand sanitizer is based on the principle of infrared reflection. When the hand is placed in the sensing area of the hand sanitizer, the infrared light is reflected by the human hand to the receiving tube, and the processed signal is sent to the pulse solenoid valve to control the hand sanitizer system. When the appropriate hand sanitizer is squeezed out, it will automatically shut down.
The realization of the liquid level detection function of the intelligent hand sanitizer also uses the optical principle to detect the liquid level. When the liquid level drops to a set position, the sensor gives a signal to remind the user to add hand sanitizer.
The photoelectric non-contact liquid level sensor can quickly and accurately detect the liquid level in the hand sanitizer. It uses the optical principle to detect the liquid level in the tank. When the liquid level drops to a certain position, the sensor gives a signal to remind the user to add hand sanitizer.
The photoelectric liquid level sensor also has a contra-beam type. There is a transmitting tube and receiving tube inside. When there is no liquid, when the transmitting tube emits infrared light, the receiving tube receives light. When there is liquid, the light is cut off and the receiving tube cannot receive the light.
The advantage of using contra-beam type liquid level sensor is that it can accurately detect the liquid level, and the detection accuracy of the liquid level can reach 1mm. This is a non-contact type, using this type sensor is more hygienic. Moreover, the volume is small, the installation is convenient, and the space required for installation is small.
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