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Feedback liquid level position signal, notify the duty room center console, water level switch is divided into: capacitive water level switch, electronic water level switch, electrode water level switch, photoelectric water level switch, tuning fork water level switch, floating ball water level switch, etc., the most popular intelligent water level controller in the market, its principle is installed in the pipeline. By detecting the height of the water level, installing the water point set by the user, starting the pump automatically at low water level, stopping the pump automatically at high water level, and protecting the pump from running idle under water shortage, it is gradually replacing the photoelectric and Hall switches to realize the intelligent control of the water level whether the water level reaches the specified water level or not, and can control the related equipment to start up. Moving or closing (e.g. pumps). Signal voltage is usually 12V or 24V safe voltage.
Capacitive type
Capacitive Water Level Switch Principle: It uses the small capacitance difference (usually PF) caused by the detection of water level changes. It is processed by a special ADA capacitance detection chip. It can output a variety of signal communication protocols, such as: IO, BCD, PWM, UART, IIC. The biggest advantage of capacitive water level detection is that it can detect the change of water level or liquid in the container through any medium, which greatly expands the practical application. At the same time, it effectively avoids the disadvantages of poor stability and reliability of traditional water level detection methods, and even can not be detected in some special fields. Because of the built-in MCU dual-core processing, the special ADA capacitance detection chip can realize many special control functions, and even more integrated and intelligent water level detection functions, such as solar water heater, coffee pot and other applications can reliably detect the current water level changes after power failure. Capacitance water level detection is the goal. The most advantageous detection method in front water level switch.
Electronic form
Principle of electronic water level switch: (not electrode type, not by water conductivity to judge the water level, the conventional size is 150 *20mm) through the built-in electronic probe to detect the water level, and then by the chip to detect the signal to be processed, when water is judged, chip output high level 24V or 5V, when judged to no water, when judged to no water The chip outputs 0V. High and low level signals are read through PLC or other control circuit boards, and drive pumps and other electrical work. The product can be installed in any direction. When installed horizontally, the water level reaches the blue line, and the accuracy is high. When the product is installed vertically, the water level moves to the red line and has certain anti wave function. The BZ2401 in this picture is a common electronic water level switch, which is suitable for normal temperature water environment. The product is sealed with epoxy resin, waterproof and sealed. It can be immersed in liquid for a long time. There are no mechanical moving parts outside, and its life is long. Electronic water level switch is suitable for water plant, precious aquaculture, plant breeding, reservoir, power supply room, sewage treatment, etc. Installation method: the same water level switch can be installed horizontally, vertically, skew and other irregular free installation, flexible and convenient. Fixation method: it is simple and easy to use. It can be fixed or fixed by thread interface (M20). Electronic water level switch can also cooperate with the controller to realize automatic control of water level. It has strong anti-wave function. In order to see the effect more intuitively, we can search the official website of electronic water level switch in Baidu and find more information.
Electrode type
The principle of electrode water level switch: the electrode water level switch consists of a primary electrode sensor and a secondary controller. The liquid level switch is installed on the top of the container or the wall of the container, and the electrode is inserted into the liquid. The control is based on single electrode supply. When the liquid level rises to contact the electrode, the current of the AC signal flows through the electrode to produce the liquid level signal. After receiving the liquid level signal, the control board rectifies, filters and amplifies the signal, and finally converts it into the output of the closed contact of the relay or the output of the standard current of 16 mA. User use. When the liquid level drops off the electrode, there is no AC signal current flowing between the electrodes, the control board can not receive the liquid level signal, the relay returns to the release state or the standard current returns to 8mA. Therefore, the liquid level can be measured correctly by contacting and not contacting the liquid with the electrode, and by sucking and not sucking the relay or by the size of the current. Users can use relay contacts or output current to contact with external equipment to achieve automatic level control. One disadvantage of the electrode water level switch is that if the electrode probe has fouling, it is prone to misoperation or non-operation.
Optoelectronic
Photoelectric liquid level switch principle: it uses infrared detection, the use of light refraction and reflection principle, light in two different media interface will produce reflection or refraction phenomenon. When the liquid under test is in high position, the liquid under test forms a interface with the photoelectric switch. When the liquid under test is in low position, the air and the photoelectric switch form another interface.
Floating ball
Floating Ball Water Level Switch Principle: Water has buoyancy, and the floating ball system is based on the buoyancy of the liquid and matching production, when the level rises, floating ball system also phase
Should rise, similarly when the liquid level drops also correspondingly drops, when rises or falls to the set position, the floating ball system will bump into the switch in the set position, so that the switch sends out the electrical signal, and the electronic control equipment will act immediately when receiving the electrical signal, cut off or switch on the power supply, forming an automatic control system. The usual method is to install a magnet in the float and make the switch move in the reed when the float moves to the position of the reed.
