Reed Relays and
Electronics India Limited
Manufacturer of Reed Switches, Reed Sensors and Reed-based products
Reed Relays and Electronics India Limited Incorporated in 1971
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Position sensing Type Applications

Position sensing
Position Sensing type application

When an application requires the end position of a movement sensed, or the sensing of a part when it comes into a zone, or when the movement of a part as it crosses an intermediary point, or when a part moves away from a zone, it is classified as a Position Sensing Application.

The best practice is to use a reed switch or a reed sensor on the fixed surface, with the magnet on the moving surface. Both normally open, normally closed or latching devices are suitable for position sensing. Provided the sensing circuit is low in the range of milli-amperes, this combination achieves error free operation for millions of operations and is also cost effective.

As the moving part with the magnet approaches the stationary part, the reed sensor or the reed switch gets actuated. This distance depends on its Operate AT band. When the moving part moves away, the reed sensor or the reed switch opens, and this distance depends on its Release AT band. The opening distance and and closing distance is highly repeatable. More information on actuating positional actuation of reed switches is available here.

Reed Switch based Vibration Switches, Inclination Switches, Pressure Switches, Float Switches and Flow Switches use these basic position sensing principles to function. The variations in the type of sensing for vibration, inclination, pressure or flow, are achieved by changes in the mechanical design of the assembly with regards to how the magnet moves to and from the reed switch.

As Reed Switches are hermetically sealed, they are immune to dust and moisture, and can safely be used in liquid level sensing applications even in explosive liquids such as fuel. Apart from tank full or empty levels that can be sensed, the actual volume of a liquid present in a tank can also be determined by combining reed switches with a simple resistance matrix to generate a potentiometeric two wire output.

Although position sensing for such applications can also be be achieved by using active devices like Hall effect sensors, Reed Switches and Reed Sensors, are passive devices that do not drain the batteries, they have the imperative advantage of using no power at all for operation, and have no leakage current across the contacts. More information on the advantages of Reed based products over Hall-effect devices is available.

Example Applications

Reed switches and Reed Sensors in Portable Defibrillators

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Magnet Sensors for Securing Fire safety and Emergency Exits

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Float Switches in Portable Air Conditioners

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Reed sensors for detecting key in ignition

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Sensors for Window Sun-shade Shutter Control

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Reed Sensors to Prevent Thievery of Cargo Containers

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Reed Sensors in Pediatric Feeding tubes

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Reed Sensors in Hotel Security Card Readers

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Reed sensors in Automobile Sun Visors

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Reed Sensors in Electric Car Chargers

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Reed switches and Reed Sensors in Barcode Scanners

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Reed Sensors for Early Brake Sensing

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Reed Switches in Exhaust Emissions Sensing

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Reed switches in Lightsabers

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Proximity sensors in Top-loading washing machines

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Magnet sensors in Hospital Electric Beds

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Reed Switches and Reed sensors in Canal Hearing Aids

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Reed switches in Transformer tap changers

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Magnet sensors for Bridge control in Airports

Reed switches in airport bridge control Airplane Bridge The bridge control operator needs to steer the bridge towards the airplane...Continue reading ->

Reed switches in Gear speed and direction sensing

Reed switches in gear speed and direction sensing Gears Mechanical machinery always have a set of manual controls that not only direct...Continue reading ->

Reed switches in Ferrous part detection

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Magnet sensors in End position sensing in Cylinders and Pistons

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Magnet sensors in Musical Greeting Cards

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Reed sensors in Radio-controlled Gliders and model Airplanes

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Reed switches in Electronics and Science Kits

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Reed switches and Reed sensors in Lap counter in slot car racing tracks

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Reed switches in Model Train Tracks

Reed switches in signal moduling in model train track Model Railway Today modelers create model railway layouts as a hobby, recreating real locations...Continue reading ->

Reed switches in LEGO Sensors

Reed switches in LEGO sensor Lego Mindstorms Lego Mindstorms is a hobby kit developed and manufactured by Lego for...Continue reading ->

Proximity Sensors in Treadmills

Reed switches in treadmill Treadmill Proximity Sensors find a few applications in treadmills for speed and gradient sensing....Continue reading ->

Reed switches in Magnet Extensometers

Reed switches in magnet extensometer Extensometer Whenever there is a deep excavation that is done prior to construction, the...Continue reading ->