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

Defibrillator Defibrillator Defibrillation is a treatment for life-threatening cardiac arrhythmia, or irregular heart beat. This...Continue reading ->

Magnet Sensors for Securing Fire safety and Emergency Exits

fire safety exit Emergency Exit Building codes provide standards for the safety, welfare and general health of...Continue reading ->

Float Switches in Portable Air Conditioners

portable ac Portable Cooler Air Conditioners remove heat and moisture from an occupied space thereby improving...Continue reading ->

Reed sensors for detecting Ignition Key

key ignition Automobile Key The Ignition key on an automobile comes in two types, a manual...Continue reading ->

Sensors for Window Sun-shade Shutter Control

window shutter Shutter Control Application Smart Homes feature automatic sun-shades or blinds as they are also...Continue reading ->

Reed Sensors to Prevent Thievery of Cargo Containers

cargo container Containerized Cargo Cargo theft is an international problem and hundreds of millions of dollars...Continue reading ->

Reed Sensors in Pediatric Feeding tubes

Pediatric feeding tube Pediatric Feeding Tube Pediatric Feeding tubes are used by nursing homes and hospitals on...Continue reading ->

Reed Sensors in Hotel Security Card Readers

hotel card reader Hotel Keycard Slot In most hotels, the most secure method to prevent unauthorized entry...Continue reading ->

Reed sensors in Automobile Sun Visors

Automobile Sun Visor Automobile Sun Visor Automobiles are fitted with visors that can be swiveled downwards and...Continue reading ->

Reed Sensors in Electric Car Chargers

E-car charger Electric Car Charging Station Electrical cars are designed to have a range of 250-300...Continue reading ->

Reed switches and Reed Sensors in Barcode Scanners

Barcode Scanner Barcode scanners in supermarkets can be clicked on to a docking system that is...Continue reading ->

Reed Sensors for Early Brake Sensing

Brake pedal Automobile Brake Pedal The Brake pedal of an automobile is a very important aspect...Continue reading ->

Reed Switches in Exhaust Emissions Sensing

Automotive exhaust fume emission Automobile Exhaust Pollution, greenhouse gases and smog play a large role in global warming...Continue reading ->

Reed switches in Lightsabers

Light Saber Light Sabers are weapons used by the Jedi and the Sith, in...Continue reading ->

Proximity sensors in Top-loading washing machines

washing machine lid position sensing Top-loading Washing Machine Traditional top-loading Washing Machines have some advantages over the front-loading ones....Continue reading ->

Magnet sensors in Hospital Electric Beds

Magnet sensors in end position detection Hospital Electric Bed Lets face it, no one likes to get into an accident...Continue reading ->

Reed Switches and Reed sensors in Canal Hearing Aids

Reed sensors in canal hearing aids In-canal Hearing Aid As widely known, Hearing Aids are devices designed to improve hearing...Continue reading ->

Reed switches in Transformer tap changers

Reed switches in transformer tap changer Transformer A transformer tap changer is an in-built mechanism which allows for variable turn...Continue reading ->

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

Reed switches in pick and place unit Pick and Place Robot For a cost effective solution to be used in heave...Continue reading ->

Magnet sensors in End position sensing in Cylinders and Pistons

Reed switches in pneumatic linear slide Linear Actuator In industrial automation, cost effectiveness is the key to running a successful...Continue reading ->

Magnet sensors in Musical Greeting Cards

Reed switches in musical greeting card Greeting Card Even in the digital age of Smart phones, people do like to...Continue reading ->

Reed sensors in Radio-controlled Gliders and model Airplanes

Reed switches in model airplanes Model Airplane Radio controlled aircrafts, gliders and helicopters come in various sizes from simple...Continue reading ->

Reed switches in Electronics and Science Kits

Reed switches in science kits Science Kit Reed Switches are used in many electronics and science kits for experimenting...Continue reading ->

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

Reed switches in lap counter in slot car racing Slot Car Racing Slot car racing (also called slot racing) is a competitive hobby of racing with powered miniature autos...Continue reading ->

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 ->

Reed switches and Float switches in Water tank control

Reed switches in water tank control Water tank control Water is a scarcity in most of the major cities of...Continue reading ->

Magnet sensors in Adjustable Chairs

Reed switches in adjustable chairs Adjustable Chair Motorized chairs are used in dentists offices and hair-cutting salons, the latter...Continue reading ->

Reed switches in Blowers

Reed switches in blowers Blower Blowers or centrifugal fans are used in various fields to move air or...Continue reading ->

Reed sensors in Emergency lamp holders

Reed switches in emergency lamp Emergency Lamps Emergency lamps are rechargeable battery powered lamp that automatically turns on when...Continue reading ->

Magnet sensors in End position sensing in hoists and fork lifts

Reed switches in end position sensing in fork lifts Fork Lift Hoists and Fork Lifts are used to transport materials over short distances,...Continue reading ->

Reed switches in Floor detection in Elevators and Lifts

Reed switches in floor detection in lifts Elevator Most people are aware of Elevators, or lifts, as they are called in...Continue reading ->

Proximity Sensors for Door and window Security

Reed switches in window security Door/Window Security Home and Workspace security is paramount and most newly constructed spaces integrate...Continue reading ->

Reed switches in liquid detection probes

Deep bore reed switch probe Liquid Detection Probe Bore holes in the ground are bored or drilled for various...Continue reading ->

Reed sensors in Wind Vanes

Reed switches in wind vanes Wind Vane A weather vane is an instrument used to show the direction of...Continue reading ->

Reed sensors in Rowing Electronics

Reed switches in rowing electronics Row Boat Rowing electronics are useful for tracking rowing information, both in actual competitive...Continue reading ->

Reed switches and Reed sensors in Pressure Gauges

Reed switches in bourdon tube pressure gauge Pressure Gauge A pressure gauge is an instrument used to display the pressure of...Continue reading ->

Reed sensors in Accurate level sensing of fluids

Reed switches in fluid level sensing Fuel Gauge In ships and yachts, it is not only necessary to monitor the...Continue reading ->

Magnet sensors in Anchor, rudder, and hatch position

Reed switches in hatch position sensing Boat Hatch Conventional and recreational sailing craft derive power from sails, and the sailor...Continue reading ->

Reed sensors used in Fuel cap position sensing

Automobile Fuel cap Automobile fuel cap open A dashboard or an instrument panel located in front of...Continue reading ->

Magnet sensors in Anti-lock braking system (ABS)

Reed switches in ABS control system Anti-lock Braking Anti-lock braking system or ABS for short, is a safety system used...Continue reading ->

Reed sensors and Magnet sensors in Two wheeler applications

Reed switches in Two wheeler applications Motorbike throttle Motor bikes and other two wheelers normally use plunger type switches for...Continue reading ->

Magnet sensors in Low fluid level monitoring

Reed switches in low fluid level monitoring Fluid Low Level Automobiles these days need to provide a wide range of information...Continue reading ->

Magnet sensors in Hydraulic arm position sensing

Reed switches in hydraulic arm end position sensing Hydraulic Arm Bulldozers, Earth Movers, Tractors, Fork Lifts and Garbage Compactor trucks use hydraulics...Continue reading ->

Reed switches in Seatbelt lock sensing

Reed switches in seat belt locking system Seat Belt Lock Seat belts are vehicle safety device used to secure the occupants...Continue reading ->

Reed switches in Coolant flow sensing

Reed switches in coolant flow sensing Radiator Coolant A coolant is a fluid, that is used to reduce or regulate...Continue reading ->