The working principle of photoelectric liquid level switch is based on the reflection and refraction phenomena of light. It contains a near-infrared light-emitting diode and a photosensitive receiver inside.

In the absence of liquid, the light emitted by the light-emitting diode is directly reflected back to the receiver from the lens. When the liquid submerges the lens, the light is refracted into the liquid, causing the receiver to not receive or only receive a small amount of light, thereby achieving the determination of the liquid level.

What are the highlights of the 01 photoelectric liquid level switch?

What are the better features

Liquid level detection and control:The photoelectric liquid level switch can detect whether the liquid level in the container or pipeline has reached the preset height, accurately detect changes in liquid level, which is its basic function, and control the start and stop of related equipment such as pumps to prevent liquid overflow or dry burning.

Automation and Intelligence:With the development of IoT technology, photoelectric liquid level switches can achieve remote monitoring and data transmission, improving production efficiency and management level.

Multi point liquid level monitoring:Multi point liquid level sensors can be made to achieve multi-point monitoring and control of liquid levels.

What problems can be solved

Prevent liquid leakage:In devices such as peristaltic pumps, photoelectric level switches can monitor leaks and prevent the loss of high-value fluids and equipment damage.

Abnormal liquid level alarm:Provide an alarm when the liquid level reaches a dangerous level to avoid flooding or drying up.

What benefits can it bring

Improve security:Reduce safety accidents caused by abnormal liquid levels through precise liquid level control.

降低成本：Reduce fluid waste and equipment maintenance costs caused by improper liquid level control.

Improve efficiency:Automated liquid level control improves the efficiency of production and processing processes.

What kind of working conditions can be handled

The photoelectric liquid level switch is suitable for various working conditions, including but not limited to:

High temperature and high pressure environment:It has the characteristics of high temperature resistance and high pressure resistance, and is suitable for liquid level monitoring in extreme environments.

Corrosive media:Corrosion resistant, suitable for monitoring corrosive liquids in industries such as chemical engineering.

Cleanliness requirements:Suitable for industries such as food and pharmaceuticals, meeting high cleanliness requirements.

02 Installation and Maintenance Guide

Installation precautions

Installation location:It is recommended to install a liquid level sensor from the side or bottom. Avoid installing from the top as this may cause droplets to hang on top of the sensor, leading to false alarms. For non viscous liquids, downward installation is usually feasible, especially when there is a high liquid level alarm and the system is shut down.

Keep clean:Regularly clean the probe of the photoelectric liquid level switch to keep it clean and dry, and avoid impurities in the liquid affecting measurement accuracy. If there is algae or other residual accumulation on the top of the sensor, cleaning media should be used to clean the outer surface, but material compatibility should be noted to avoid using cleaning agents that may damage the sensor material.

maintenance and upkeep

According to the characteristics and application environment of the instrument itself, corresponding maintenance measures should be taken, such as avoiding contact between the instrument and corrosive media, reducing mechanical wear, etc.

Environmental lighting:Avoid installing sensors in locations that may be exposed to direct ambient light to reduce the risk of false alarms.

Reflective surface:If you need to install the sensor within 10mm of the reflective surface, please consult a technician first. Especially for LLG sensors provided by the industrial mining network, it is advisable to avoid placing the top of the sensor within 50mm of the reflective surface.

Electrical connection guidance

Wire protection: Do not immerse the sensor wires in liquid for a long time to avoid irreparable damage.

Load impedance: Ensure that the load impedance does not exceed the output current when connecting the load. Before installation, please confirm the relevant technical parameters.

Avoid short circuiting: Short circuiting the output to VS or VO can cause irreversible damage to the sensor.

Installation method: Do not hang the sensor to avoid damage.

Cable protection: Avoid excessive dragging of cables, such as pulling or tugging, as this may damage the cables or connections.

Following these guidelines can help you install and use photoelectric level switches correctly, ensuring their stable and reliable performance.

03 About Fanyi

Shanghai Fanyi Technology Electronics Co., Ltd. was established in May 1999, specializing in the research, production, and sales of various types of material/liquid level switches and meters.

Since its establishment, we have invested a certain proportion of funds each year to focus on research and development work, contributing to the improvement and innovation of our products. As a result, we have obtained qualifications such as a technology giant enterprise and a specialized and innovative enterprise; And invited to join as a member of the National Standardization Management Committee of China and the National Technical Committee for Industrial Process Measurement, Control and Automation Standardization (TC124/SC1&TC124/SC2).

In the past five years, Fanyi Technology has participated in drafting and formulating more than 40 national and industry standards, many of which have been announced and implemented, accelerating the industrial upgrading of related industries in China, improving industrial production efficiency, and enhancing product quality and functionality.

Our products cover various types of conveyors, flow meters, pressure and temperature transmitters, as well as various bridge breakers, and are widely used in various environments of factories to meet the requirements of fully automated control operations for customers. In the future, we will strengthen the creation, protection, utilization, and management of intellectual property rights, providing strong technological support for the steady development of the company.