Differences and advantages and disadvantages of photoelectric liquid level sensor and capacitive liquid level sensor

Commonly used water level sensors include photoelectric, separate, capacitive, weighing, etc. The following is a comparison of photoelectric liquid level sensors and capacitive liquid level sensors. Working principle of photoelectric liquid level sensor: Photoelectric liquid level sensor is a new type of contact point liquid level measurement and control device developed by using the principle of reflection and refraction of light at the interface of two different media. Its working principle is that the product 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 liquid level switch, the light is refracted into the liquid, so that the receiver can not receive or only a small amount of light. The photoelectric liquid level switch senses this change in working conditions, and the receiver can drive the internal electrical switch to activate 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. It can be seen from the working principle that the photoelectric liquid level sensor is used to detect liquids, including stable substances, the interface between two immiscible liquids and the appearance of deposits. Their work is based on changes in the transmission of infrared light emitted by infrared LEDs. Using high-energy infrared diodes and pulse modulation methods, light-producing interference can be reduced. Photoelectric level sensors, on the other hand, use high-intensity lasers that can be injected into dusty environments and notice liquid substances. Photoelectric liquid level sensor advantages and disadvantages Compact, high pressure, no moving parts and temperature capability, can notice trace amounts of liquid. Since the sensor needs to be in contact with the liquid and needs power supply, some wide substances may cause the coating on the prism. Capacitive liquid level sensor Capacitive liquid level sensor is a kind of variable dielectric capacitor that uses the change of the measured medium surface to cause the capacitance change. . It is used to detect the change of liquid level like mud and aqueous solution. The sensor is used to check the change of liquid level by using a probe made of polytetrafluoroethylene insulated wire. The change of liquid level causes capacitance change, according to the detected capacitance value. The size of the sensor is used to determine whether the position of the sensor is in a water state or an anhydrous state. However, stainless steel probes are extremely responsive, making them suitable for measuring non-conductive particles or materials with low dielectric constants. These types of sensors are very easy to use and clean because they don't have any moving parts. Advantages and Disadvantages of Capacitive Liquid Level Sensors Capacitive liquid level sensors have a major feature that capacitive liquid level sensors can detect changes in water level without touching the liquid. Therefore, when the container does not need to be opened, and there is dirt, impurities, and sediment in it, it will not affect the test results. So what are the advantages of 'photoelectric liquid level sensor' compared to 'capacitive liquid level sensor'? 1. The photoelectric liquid level sensor uses an optical method to detect the existence of the liquid level, so it will not affect the purity, concentration, and precipitation of the liquid after long-term use of the liquid. The capacitive liquid level sensor uses the different capacitances generated by the change of the water level to determine the level of the water level, so there will be different resistance changes for different water quality. The difference in water quality will directly affect its accuracy, and it is impossible to detect some liquids The accuracy on the water surface is: ±0.5 MM The water surface accuracy of the capacitive liquid level sensor is: ±1.5 MM4. The photoelectric liquid level sensor can also have great advantages in the installation structure of the machine water tank, and can be installed in any orientation. Compared with capacitive liquid level sensors, the limitations are much larger.
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