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Reed Switch (Reed Switch) Application Overview

- May 22, 2018 -

Following the principles and precautions listed in our instructions for use, the use of reed switches and reed sensors is quite simple. Although the reed switch application is huge, we can roughly divide it into four categories. Most applications are not one of them. Later, we will propose specific products for each application, but this does not mean that other products in the same product category are not suitable.


 Position sensing

 Pulse counting

 Application of coil

 Temperature sensing

 


Position sensing

When an application requires proximity sensing, end position sensing or sensing of a moving part, a reed switch or a reed sensor “can be fixed to a stationary surface and fixed to a magnet on a moving surface” can do jobs. When the moving part is away from the fixed part, the reed sensor still does not brake. The reed sensor is activated because the moving part comes from a nearby fixed part. This braking distance (close and far away) is highly repeatable. Sensors such as shock sensors, vibration sensors, tilt sensors, pressure sensors, and flow sensors use this basic position sensing function.


Since the reed sensors are sealed, they are free from dust and moisture and can be safely used in liquid level position detection applications. In addition to the level detection at the top and bottom, the actual volume of liquid present can also be combined, and results can be given by using a simple two-wire output of the resistor matrix sensor potential. Although this can be achieved through the use of active devices such as Hall-effect sensors, reed sensors, it is passive and must be used with no power and no leakage current between contacts.


Pulse counting

Reed switches have a very high operating frequency and this function itself is used for high-speed pulse counting applications. A rotating wheel or an object that repeatedly moves back and forth. It mounts the magnet. The fixed part of the reed sensor will generate the required number of pulses. The reed sensor is connected to a counter for sensing the pulse. If the magnet cannot be used in the application, the special part of the induction ferromagnetic part of the reed switch can be used. Liquid flow detection and gas flow meters, power meters, automotive ABS, and odometer pulse counting utilize this principle.


Application of coil

Producing relays using reed switches is simple compared to traditional electromechanical relays that require many moving parts. Based on reed relays, one or more reed switches can be inserted into the spool to perform millions of operations in a very small size. Current sensors find application in overload protection of almost every electronic circuit. Current sensors find overload protection to be used in almost all electronic circuits.


Temperature sensing

Due to its sharp cuts, reduced bandwidth, and high reliability characteristics, thermal reed switch over-temperature protection or precise temperature switches are used in bimetal strips, thermistors and thermostats.


From the cut-out temperature suddenly the resistance of the reed contact resistance of a few milliohms to a huge change to several mega-ohms open circuit resistance, cut off the temperature difference is different. In other words, an overall galvanic separation occurs, and the thermal reed switch can sense sub-zero temperatures as low as -30°C.


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