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

Position sensing Type

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

Magnet Sensors for Two Wheeler Side Stand Sensing

Motorcycle Sidestand Magnet Sensors are used in two wheelers to sense whether the side stand has...Continue reading ->

Float Switches in Portable Air Conditioners

portable ac Portable ACs cool an area by removing the humidity in the room and storing...Continue reading ->

Reed sensors for detecting Ignition Key

key ignition As long as the ignition key detecting reed sensor is not actuated means that...Continue reading ->

Reed Sensors to Prevent Thievery in Cargo Containers

cargo container Reed Sensors added to the GPS units serve as a theft proof device by...Continue reading ->

Reed Sensors in Pediatric Feeding tubes

Pediatric feeding tube To know the location of the end of a feeding tube, tiny reed switches...Continue reading ->

Reed Sensors in Hotel Security Card Readers

hotel card reader In most hotels, the simplest method for a guest to enter a room is...Continue reading ->

Reed sensors in Automobile Sun Visors

Automobile Sun Visor A reed sensor and a magnet is used in the sliding mirror assembly to...Continue reading ->

Reed Sensors in Electric Car Chargers

E-car charger Electrical cars are designed to have a range of 250-300 kilometers on a full...Continue reading ->

Reed switches and Reed Sensors in Barcode Scanners

Barcode Scanner A reed switch and magnet combination is used in the docks and barcode scanners...Continue reading ->

Reed Sensors for Early Brake Sensing

Brake pedal When the brake pedal is pressed, the magnet is the first to move away...Continue reading ->

Reed Switches in Exhaust Emissions Sensing

Automotive exhaust fume emission A simple vane with a magnet fitted inside the tailpipe of automobiles is used...Continue reading ->

Reed switches in Lightsabers

Reed Switches are used in Lightsabers to for power up only when the owner...Continue reading ->

Magnet sensors in Top-loading washing machines

washing machine lid position sensing Magnet Sensors are used in Top-loading washing machines to stop the cycle instantly, if...Continue reading ->

Magnet sensors in Hospital Electric Beds

Magnet sensors in end position detection Hospital electric beds come with a adjustment buttons that either raise the upper portion...Continue reading ->

Reed Switches and Reed sensors in Canal Hearing Aids

Reed sensors in canal hearing aids A tiny reed sensor inside hearing aids help the user adjust volume levels and...Continue reading ->

Reed switches in Transformer tap changers

Reed switches in transformer tap changer Tap changers in transformers involve protection and control schemes and one of them is...Continue reading ->

Magnet sensors for Bridge control in Airports

Reed switches in airport bridge control A bridge control operator needs to steer the bridge toward to airplane door for...Continue reading ->

Reed switches in Gear speed and direction sensing

Reed switches in gear speed and direction sensing Miniature ferrous part detection sensors can be positioned near gears to sense the speed...Continue reading ->

Magnet sensors in End position sensing in Cylinders and Pistons

Reed switches in pneumatic linear slide Most pneumatic cylinders, pistons, linear slides and rotary actuators are manufactured with inbuilt magnets...Continue reading ->

Magnet sensors in Musical Greeting Cards

Reed switches in musical greeting card Ultra miniature reed switches can be used in electronic greeting cards with magnets to...Continue reading ->

Reed sensors in Radio-controlled Gliders and model Airplanes

Reed switches in model airplanes Reed Sensors are very light devices and can be used in model airplanes, helicopters...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 tracks usually count the number of laps by having a small...Continue reading ->

Reed switches in LEGO Sensors

Reed switches in LEGO sensor Reed Switches can be built into LEGO bricks to sense position and rotation. Position...Continue reading ->

Reed switches in Magnet Extensometers

Reed switches in magnet extensometer Reed Switches are used in magnet extensometer probes to monitor settlement and heave in...Continue reading ->

Reed switches and Float switches in Water tank control

Reed switches in water tank control Reed Switch based float switches are used to control the pump, which fills an...Continue reading ->

Magnet sensors in Adjustable Chairs

Reed switches in adjustable chairs Chairs and beds with electronic controls for adjusting tilting and height use reed sensors...Continue reading ->

Reed switches in Blowers

Reed switches in blowers In blowers and vacuum ducts, a vane with a tiny light magnet is fitted...Continue reading ->

Reed sensors in Emergency lamp holders

Reed switches in emergency lamp When emergency lamps are taken off their holders, a buzzer should sound. The lamp...Continue reading ->

Magnet sensors in End position sensing in hoists and fork lifts

Reed switches in end position sensing in fork lifts Hoists and fork lifts use hydraulics to move cylinders and pistons to life heavy...Continue reading ->

Reed switches in Floor detection in Elevators and Lifts

Reed switches in floor detection in lifts Latching reed sensors can be mounted on every floor, and a magnet on the...Continue reading ->

Magnet Sensors for Door and window Security

Reed switches in window security Magnets can be mounted on doors and windows, and reed sensors, on the fixed...Continue reading ->

Reed switches in liquid detection probes

Deep bore reed switch probe Reed switch based float switches are fitted with a perforated sheet around the whole...Continue reading ->

Reed sensors in Wind Vanes

Reed switches in wind vanes Eight reed switches are mounted radially at 22.5 degree angles making compass points on...Continue reading ->

Reed switches and Reed sensors in Pressure Gauges

Reed switches in bourdon tube pressure gauge Bourdon tube pressure gauges are fitted with a magnet on the Bourdon tube itself...Continue reading ->

Reed sensors in Accurate level sensing of fluids

Reed switches in fluid level sensing Special reed sensors with an integrated resistor can be mounted on PCBs to give...Continue reading ->

Reed sensors in Rowing Electronics

Reed switches in rowing electronics Reed Sensors are used in water proof rowing equipment like stroke meters to count...Continue reading ->

Magnet sensors for Anchor, Rudder, and Hatch position detection

Reed switches in hatch position sensing Just as reed sensors are used in automobiles for end position and intermediary position...Continue reading ->

Reed sensors used in Fuel cap position sensing

Automobile Fuel cap Driver information. Instrument panel dashboards need to show more and more information for the...Continue reading ->

Reed switches in Coolant flow sensing

Reed switches in coolant flow sensing A simple, cost effective reed switch based flow sensor can be connected in the...Continue reading ->

Reed switches in Defective lamp detection

Reed switches in Defective lamp detection Tail lamps and parking lamps are very vital elements of an automobile and any...Continue reading ->

Reed sensors for Two Wheeler Brake Sensing

Reed switches in Two wheeler applications Motor bikes and other two wheelers use plunger type switches for detecting depression of...Continue reading ->

Magnet sensors in Low fluid level monitoring

Reed switches in low fluid level monitoring Wind screen viper fluid, brake oil, power steering oil, and radiator coolant tanks can...Continue reading ->

Magnet sensors in Hydraulic arm position sensing

Reed switches in hydraulic arm end position sensing Bulldozers, earth movers, tractors, fork lifts and garbage compactor trucks use hydraulics to move...Continue reading ->

Accidental airbag deployment prevention

Reed switches in airbag deployment When a collision occurs, accidental deployment of the airbags is prevented, by sensing whether...Continue reading ->

Reed sensors in Accurate fuel level sensing

Reed switches in fuel level sensing Special reed sensors with an integrated resistor can be mounted on PCBs to give...Continue reading ->

Reed switches as Impact sensors for triggering airbags

Accidental Airbag Prevention Statistics say almost 80% of automobiles use reed switch based crash sensors for triggering...Continue reading ->

Reed switches and Reed sensors in Sewing machine pedals

Reed switches in sweing machine pedals Reed Sensors inSewing Machine's controls the speed of switching. These are far superior to...Continue reading ->

Reed switches in Washing machine vibration detection

Reed switches in washing machine Reed Switches are used for building bi-directional vibration sensors. These sensors can detect if...Continue reading ->

Reed sensors in Electric Toothbrushes

Reed switches in electric toothbrush Electric toothbrushes use Reed Sensors to sense change in direction when switching from the...Continue reading ->

Magnet sensors for Dish Washer spray arm jam detection

Reed switches in dish washer spray arm jam detection Reed Sensors are used in dish washers for spray arm jam detection and door...Continue reading ->