Banner Sensors - The difference between photoelectric level switches and capacitive level sensors

The increasing adoption of industrial automation, technological advancements in liquid level sensors, and increasing usage in the energy and power sectors will drive the growth of the global liquid level sensors market. However, the lack of precision and accuracy of liquid level sensors may hinder the market growth. There are several types of liquid level sensors, photoelectric, separate, capacitive, and piezoresistive, and each type has its own characteristics and advantages. Next, the editor of Gongcai.com will learn about the differences between photoelectric level switches and capacitive level sensors?

Photoelectric level switches are used to detect liquids, including stable substances, interfaces between two immiscible liquids, and the presence of deposits. Their work is based on the variation in the transmission of infrared light emitted by infrared LEDs. Using high-energy infrared diodes and pulse modulation methods, it is possible to reduce the interference that produces light. Photoelectric level switches, on the other hand, use a high-intensity laser that can be injected into a dusty environment and notice the liquid substance. They are commonly used in applications such as leak detection and tank level measurement.

The capacitive liquid level sensor is a new type of gauge point liquid level meter measurement and control technology equipment developed and designed by the basic principle of light refraction in two different substance pages to produce reflective surface mapping. It has a simple construction and high accuracy level; There are no mechanical parts, no adjustment is required; High sensitivity and corrosion resistance; Low power consumption; Small size and many other advantages are slowly recognized by the sales market.

From the above, it can be seen that the photoelectric level switch is a control board that outputs the gate valve for adding water or seepage according to the data signal of the liquid level sensor, so as to maintain the stability of the water level line. It can also be said that the output of the photoelectric level switch is a kind of power switch data signal, and the photoelectric level switch should first clarify the height and width ratio of the liquid level meter, and output the switching data signal according to this height and width ratio. The liquid level sensor converts the aspect ratio of the liquid level gauge into an electronic signal for output. We can solve the problem of electronic signals, e.g. with PLCs, data acquisition terminals or professional displays, to output the aspect ratio of the level gauge. There is also the basic principle of photoelectric level switches and capacitive level sensors, although they are the same. However, the photoelectric level switch is a power switch control loop, and the capacitive level sensor is equivalent to the DC transformer, the circuit element used for conversion. Therefore, the differences between photoelectric level switches and capacitive level sensors are as follows:

(1) Because the output of the liquid level meter is only related to whether the optical camera touches the liquid level, and is not related to other main parameters of the substance, such as temperature, working pressure, relative density, electricity and other main parameters, the capacitance level sensor inspection is accurate, repeated and high-precision; The response time is fast, the level is precisely manipulated, and the application can be installed immediately without calibration.

(2) Because the capacitive level sensor camera volume is relatively compact, it can be installed separately and installed in a suitable unique storage tank or utensils in a narrow indoor space. In addition, it is possible to install several optical cameras on one precise measuring body to make a little more liquid level sensor and transformer.

(3) Because all the electronic devices inside the sensor are encapsulated with epoxy resin, there are no mechanical equipment theme activity components inside the inductor, so the capacitive level sensor has high reliability, long life and maintenance-free.

Banner Sensors - The difference between photoelectric level switches and capacitive level sensors

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