what is a reed switch used for


Reed switches may be an older technology, but they are far from obsolete.

They are made from two or more ferrous reeds encased within a small glass tube-like envelope, which become magnetised and move together or separate when a magnetic field is moved towards the switch. Although these switches are being used in lots of devices around the world today, alarm systems seem to be the most common devices they can be found in. A movable window or door houses a magnet, and the sensor resides on the base, passing a signal until the magnet’s removal. A reed switch is an electromagnetic switch used to control the flow of electricity in a circuit. Finally, they help to check door positions.
They are used in making of tamper-proof.

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Reed switches can be used with permanent magnets (for example, to detect doors closing), but for the reed relays, the field is generated by a coil, which can have a current passed through in response to a control signal. Like any electrical switch, a reed switch is a device used to control the flow of electricity.

The reed switch was born in 1936. This is a switch which has been designed to facilitate the flow of current inside a circuit. The switch looks like a small glass capsule with electrical leads poking out of each end. But unlike most other types of switches, reed switches do not require someone or something to physically operate them. A typical example is a flip phone which can be opened and closed. Have you ever seen any of those doors or windows which close automatically once there is no one around? Reed switches are sometimes also fitted to the spinning arms of dishwashers to detect when they jam, and in the thermal cut-offs in electric showers (to stop the water heating to dangerous levels).

In case you don't know reed switches are becoming increasingly popular amongst different products today.

Because of this, reed switches are often also referred to as magnetic switches, proximity switches or proximity sensors.One of the unique characteristics of reed switches is high-speed switching with no mechanical wear. The company maintains a network of more than 336 locations worldwide.To choose which arrow.com newsletter(s) you want to receive just hit the Subscribe button below.Our website places cookies on your device to improve your experience and to improve our site. This should explain how such switches are being considered by manufacturers of these devices in recent times.

They definitely reflect the future of electronics and appliances. DRAM, SRAM, flash, and EEPROM are by far the most popular memory chips of choice in design. The switch effectively works like a gate, or a bridge, in an electric circuit so when the two reeds are in contact, electricity can flow around the circuit operating a device. If a reed switch is open, electricity does not flow; if the switch is closed, electricity flows. Reed switches are operated by the proximity of a magnetic field.

Finally, they help … They are made from two or more ferrous reeds encased within a small glass tube-like envelope, which become magnetized and move together or separate when a magnetic field is moved towards the switch. Modern refrigerators aren't complete without the inclusion of reed switches in them. Most people make the mistake of thinking that they are similar to This is because they tend to be different in lots of regards. Take advantage of these switches today and make your device function optimally. There is no doubt that the automobile industry has advanced at an incredible pace over the years with some breathtaking discoveries and innovations. It may surprise you to find out that devices such as laptops, phones and tablets do have reed switches.

Reed switches are operated by the proximity of a magnetic field. Once touching, the blades close the normally open (NO) contacts, allowing electricity to flow. The common lead will be in contact with one contact in its normal position until a magnetic field is introduced moving the common lead to be in contact with the other contact. When a magnet is moved close to a switch, or the switch close to a magnet, the reeds repel one another and split apart, breaking the circuit. Choosing the right magnet for a switch can be confusing as the density of a magnet’s magnetic field is measured in The following calculation used to work out the above values allows you to work out the flux density of a disc magnet at any distance directly above the central point of the magnet’s pole.If you want to calculate how the flux density of a disc magnet decreases over a distance, you can use the following calculation.Br = Remanance (e.g. Opening the door again forces the reeds to contact each other thereby making the light to be switched on.

166,767 Lasers also are sometimes used to adjust the sensitivity of reed switches by slightly bending the switch blades to change the size of the contact gap. A reed switch uses two magnetized strips of metal to make or break a contact when a magnet is brought close to them.

In this configuration, the current flows along a common lead which can be toggled between two contacts.


Some reed switches also contain a non-ferromagnetic contact, which forms a normally closed (NC) output.

The coil surrounds the reed switch and generates the axial magnetic field needed to close the reed contacts.

Reed relays and reed switches are used in many areas where smaller, faster acting relays are needed in an electronic or electrical circuit.

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Posted by / September 11, 2020