How does a Reed Switch Sensor work?

The Reed Switch Sensor is a versatile device that has many applications in the modern world. It is often used to detect changes in magnetic fields, measure distance or direction, and provide security features for access control systems. The Reed Switch Sensor offers a low power consumption and can be customized to meet specific requirements for any given application. With its wide range of uses, it's no wonder why the Reed Switch Sensor continues to be an invaluable tool for so many industries today.

• How does a Reed Switch Sensor work?

• What is the working principle of Reed Switch Sensor?

• What are the precautions for using the Reed Switch Sensor?

How does a Reed Switch Sensor work?

The working principle of the dry reed switch is very simple. Two overlapping magnetizable reeds at the ends are sealed in a glass tube. The distance between the two reeds is only about a few microns. The glass tube is filled with high-purity inert gas. , before operation, the two reeds are not in contact, and the external magnetic field causes the two reeds to have different polarities near the end positions. As a result, the two reeds with different polarities will attract each other and close. According to this technology, a switching component with a very small size and volume can be made, and the switching speed is very fast and has excellent reliability. The position and orientation of the permanent magnet determines when and how many times the switch is turned on and off.

What is the working principle of Reed Switch Sensor?

Reed switches usually only collect switching signals, and some reed switches can also be used for frequency detection at lower frequencies, usually up to a few KHz.

The so-called sensor is actually using various methods to convert some physical quantities that are not convenient for direct measurement into electrical signals that are more convenient for measurement. For example, a temperature sensor, which can produce changes in resistance value with changes in temperature, etc. Wait.

Commonly used sensors generally include pressure, position, temperature, humidity, brightness and other sensors. The basic principle of many sensors is to change the physical quantity through the change of resistance value, position, inductance and capacitance, etc., to make the subsequent circuit detect and process.

What kind of sensor to use for a specific physical quantity depends on your specific requirements. For example, it is also a pressure sensor, which can be made of conductive glue, strain gauge, inductive or capacitive, etc.

What are the precautions for using the Reed Switch Sensor?

First, the contacts and reeds are fairly small and delicate, so it's difficult for them to withstand high voltage or high current. When the current is too large, the reed will lose its elasticity due to overheating. That is, the switching capacity is small, the contacts are prone to jitter and the contact resistance is large.

There are many troubleshooting procedures. The faulty reed switch needs to be detected by special instruments (such as AT value tester, insulation withstand voltage tester, internal resistance tester, etc.).

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