Capacitive Switch

AIPUXin: Your Professional Capacitive Level Switch Supplier!

Shandong AIPUXin Automation Instrument Co., Ltd. specializes in the development, design, and production of intelligent automation sensors. As market demands change, our company has developed RF capacitive liquid level switches, magnetostrictive liquid level transmitters, RF capacitive liquid level transmitters, microwave material level switches, radar liquid level transmitters, tuning fork density meter series products, etc. We have been working hard to create first-class products and become a first-class enterprise.

Our Advantages

Professional Production Equipment

Our modern factory is equipped with advanced CNC lathes, Mounters, oscilloscopes, sandblasting machines, argon arc welding machines, Ammeter, computer wire stripping machines, high-temperature test boxes, etc.

Continuous Product Innovation

Our company continues to innovate products, has more than 200 products, and has obtained more than 80 patents. CE certification, ISO9001, SIL certificates, etc., which enhance the credibility of our products and improve their competitiveness.

Strict Quality Inspection

Our R&D, design, and production strictly comply with international standards, and each process has strict operating procedures. More than 30 sets of testing and processing equipment help ensure product quality.

24-Hour Service System

The professional service team can quickly solve the problems users encounter and also provide customers with lifelong technical services. Video tracking services and emails make it easy for us to communicate with our customers on the fly.

Introduction to Capacitive Level Switch

RF capacitance level switch is a high-precision liquid level measuring instrument that operates based on the principle of radio frequency capacitance. It detects the liquid level or material level through the change in capacitance between the probe and the measured medium. The level switch usually consists of a probe and a control unit. The probe is equipped with sensitive capacitance detection elements, which adjust their capacitance value according to the properties of the surrounding medium.

Types of Capacitive Level Switch

Symmetrical capacitive level switch
Dielectric Constant Change: Liquid level changes cause the dielectric constant of the dielectric to change, thereby affecting the capacitance. Variable Plate Distance: Liquid level changes cause the distance between the capacitor plates to change, thereby changing the capacitance.
Asymmetric capacitive level switch
Variable Area: Liquid level changes cause the contact area between the capacitor plates to change, thereby affecting the capacitance. Variable Electrode Shape: Liquid level changes cause the electrode shape to change, thereby changing the capacitance.
Composite capacitive level switch
Combining the characteristics of symmetrical and asymmetric capacitive types, the sensitivity and measurement range are improved by designing a complex electrode structure.
Metal induction capacitive level switch
Specially used to detect liquid level changes in metal containers. Since metal containers have a strong shielding effect on electric fields, specially designed capacitive sensors are required.
High-frequency capacitive liquid level switch
Using a high-frequency oscillator as the sensing element, changes in liquid level cause changes in capacitance, thereby affecting the frequency of the oscillator. This type of switch is suitable for occasions with high response speed requirements.

Advantages of Capacitive Level Switch

High precision
Using advanced electronic technology to provide high-precision measurement results.
High reliability
Simple structure, no moving parts, reduce the possibility of damage and reduce maintenance requirements.
Anti-interference performance
Using digital filtering and anti-interference technology to effectively shield electromagnetic interference in industrial environments.
Easy to install
Small device size, easy to install in a variety of complex industrial environments.
Output diversity
Different output modes can be selected according to system requirements, such as relay output, transistor output, etc.

Application of Capacitive Level Switch

Petrochemical

In order to adapt to various complex working conditions in the petrochemical industry, capacitive level switches are usually designed to be explosion-proof, corrosion-resistant, high-temperature resistant, etc. In addition, in order to improve the accuracy and stability of measurement, intelligent processing methods are also used, such as integrated microprocessors to monitor and calibrate the changes in capacitance in real time, to eliminate external interference and compensate for errors caused by factors such as temperature and pressure.

Thermal Power Plant

In thermal power plants, accurate control of boiler water level is essential to ensure steam production and power generation efficiency. Capacitive level switches can be used to monitor boiler water level to ensure that it is maintained within a safe range to prevent excessive water level from causing deterioration in steam quality or excessive water level from causing boiler damage.

Food and Beverage Industry

Capacitive level switches used in the food industry usually need to comply with relevant food safety and hygiene standards, such as being made of stainless steel or other food-grade materials, easy to clean and sterilize, and having good sealing properties to prevent contamination. In addition, depending on the application scenario, they may also need to have characteristics such as corrosion resistance, high temperature resistance, and waterproofness. With the accurate and reliable level data provided by these level switches, the food industry can ensure that its production process runs efficiently and safely, and guarantee product quality.

Pharmaceutical Industry

In the batch production process of medicines, a large number of reaction tanks and storage tanks are required. Capacitive level switches can be used to monitor the liquid levels in these tanks in real time to ensure the continuity and efficiency of the production process.

Working Principle of Capacitive Level Switch

The RF capacitance level switch uses the change of capacitance to measure the liquid level or material level. When the capacitor on the probe contacts the surrounding medium, its capacitance will change. This change is converted into an electrical signal and further converted into a switch signal output. When the liquid level or material level reaches the preset point, the capacitance of the probe changes accordingly, triggering the switch action. The RF capacitance level switch is not only suitable for liquids, but also for the measurement and control of the liquid level or material level of solid granular materials.

What factors should you consider before choosing a Capacitive Level Switch?

01/

Liquid properties
Capacitive level switches are suitable for a variety of liquids, but understanding the specific properties of the liquid, such as dielectric constant, corrosiveness, viscosity, etc., will help to more accurately select the appropriate switch model and material.

02/

Measuring range
Choose a capacitive level switch with a measuring range that meets the requirements according to the actual application requirements. For example, different monitoring requirements such as full tank monitoring, intermediate volume monitoring, or empty tank monitoring require different switch configurations.

03/

Accuracy requirements
If high-precision liquid level control is required, ensure that the accuracy of the selected capacitive level switch meets the requirements. The accuracy of capacitive level switches may vary depending on different models and manufacturers, so it is necessary to select according to specific needs.

04/

Working environment conditions
Consider the working environment conditions of the level switch, including factors such as temperature, pressure, corrosiveness, humidity, etc. These factors may affect the performance and life of the switch. Therefore, a capacitive level switch with an appropriate protection level and environmental resistance should be selected.

05/

Installation and ease of use
Choosing a capacitive level switch that is easy to install and easy to use can reduce the cost of use and improve work efficiency. For example, choosing a switch with standard wiring can be easily connected to the control system; choosing a switch with a simple mounting structure can shorten the installation time and reduce the difficulty of installation.

06/

Cost considerations
Capacitive level switches of different types and configurations have different prices. Therefore, it is necessary to select the appropriate switch model and configuration according to the actual budget.

Our Certificate

3A certification, CE certification, ISO9001, SIL certificate, explosion-proof certificate, etc. prove our company's professional strength and the high quality of our products.

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Our Factory

Our company was established on July 9, 2012, located at No. 106-108, Building 4, 11th Street, Block B, Haode Trade City (Anju), with an existing plant area of 3000 square meters. Professional production equipment and employees continuously promote product innovation and optimization.

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Ultimate FAQ Guide to Capacitive Level Switch

Q: What are capacitive switches used for?

A: A capacitive switch is an electronic switch whose main function is to close and open the switch by changing the capacitance. Capacitive switches use the change in capacitance between an object and a metal probe to detect the presence of an object. When an object approaches the switch, it changes the distance between the two plates and causes a change in capacitance, which triggers the switch action.

Q: What is a capacitance level limit switch?

A: A capacitive level limit switch is similar to a normal capacitive level switch, but it is mainly used to limit the liquid level to a certain height. Once the liquid level reaches the preset limit, the switch will operate to prevent the liquid level from rising further, which may be used for safety purposes or to control the fill level of a container.

Q: How do capacitive switches work?

A: Capacitive switches use the physical quantity of capacitance to detect the presence or distance of an object. Typically, a capacitive switch includes two electrodes. When an object approaches these electrodes, it affects the capacitance between the electrodes, causing a change in the circuit state. This change can be detected and used to trigger some action or output signal.

Q: What are some common applications of capacitive switches?

A: Capacitive switches are widely used in a variety of fields, including home appliances, industrial control, automotive systems, medical equipment, etc. They can be used for touch-controlled surfaces (such as mobile phone screens), liquid level sensors, proximity detection, gesture recognition, and various other sensor applications.

Q: What is the difference between capacitive switches and resistive touch screens?

A: Capacitive switches rely on the capacitance change introduced by the user's touch to detect touch events, while resistive touch screens rely on pressure to bring two layers of conductive film into contact to complete the detection of touch. Capacitive touch screens are generally more sensitive and responsive, and support multi-touch, but the cost is higher than resistive touch screens.

Q: How to choose the right capacitive switch?

A: When choosing the right capacitive switch, you need to consider several factors, including the application environment, the required sensitivity, the switch size, durability, the operating temperature range, and whether there is a need for waterproof or dustproof.

Q: Do capacitive switches need to be calibrated regularly?

A: Capacitive switches generally do not require frequent calibration, but if they are used in extreme environments or if performance degrades, calibration may be required to ensure their accuracy and reliability.

Q: Can capacitive switches detect non-conductive materials?

A: Yes, capacitive switches can detect non-conductive materials because they work mainly by detecting the interference of objects on the electric field. However, for non-conductive materials, longer sensing distances and more complex circuit designs may be required.

Q: How do capacitive switches deal with environmental interference?

A: Environmental interference can be reduced by filters, shielding techniques, and proper circuit design. In addition, many capacitive switches have adaptive capabilities and can automatically adjust their parameters to adapt to environmental changes.

Q: What is the life of a capacitive switch?

A: The life of a capacitive switch depends on its material and construction quality. A high-quality capacitive switch can last for millions of operations without performance degradation. However, when used in harsh environments, it may be affected by corrosion or contamination, which will shorten its life.

Q: Can capacitive switches achieve waterproof functions?

A: Yes, there are many specially designed capacitive switches that can achieve waterproof functions. They usually have sealed housings and special trigger circuits that can work properly in humid environments.

Q: Are there any alternatives to capacitive switches?

A: Although capacitive switches are very popular and practical, there are other types of touch switches as alternatives, such as resistive, sonic, infrared, etc. Each type has its own unique advantages and applicable occasions.

Shandong Aipuxin Automation Instrument Co., Ltd. is one of the most professional capacitive switch manufacturers and suppliers in China, specialized in providing high quality customized service. We warmly welcome you to wholesale cheap capacitive switch in stock here from our factory. For price consultation, contact us.

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