It is most economic, handling loads from zero load up to 250 w in a wide range of applications. They break easily the casing of the reed switch body is typically made of glass and is very fragile. Dropping a reed switch onto a hard surface, from a height of 30cm or more, can result in the. Reed switches like this are called normally closed nc normally switched on, so electricity flows through them most of the time. A reed switch is an electromagnetic switch used to control the flow of electricity in a circuit. As the magnet is brought into the proximity of the reed sensor switch, the device activates. The switch contacts of a reed switch are sealed in an airtight glass tube. A reed switch is a passive device consisting of two reed blades sealed inside a glass tube with an inert gas, which operates when brought near a magnetic field. If shock in excess of 294ms2 is applied to a reed switch the pullin value is subject to change from standard specifications. The sensors act as nonlatching electrical switches. Due to resonant frequency a reed switch may not operate properly if vibration is applied in excess of 2khz even minute acceleration. So, if you want a circuit triggered by a reed switch to remain on or off, it will be necessary to use a latching relay circuit.
The addition of a normally closed contact to the standard normally open contact meets the needs hamlin reed switch selection guide a quick reference guide to selecting reed switches for electronic applications. Standex is the worlds largest producer of reed switches and come in low to high voltages for every application. Reed relays and products because of the reed switch s unique switching capability. It is absolutely imperative that reed switches are not dropped. A wide variety of reed switch price options are available to you, there are 436 suppliers who sells reed switch price on, mainly located in asia. View and download smc networks reed switch solid state switches manual online. Hsi sensing has years of experience handling reed switches and have identiied several best practices. A magnet is used to pull the two contacts together to. Reed switch working principle instrumentation tools. The reed switch is the core element in reed sensors, level sensors and reed relays. How to handle a reed switch reed switches consist of two or three metal reed contacts blades that are hermetically sealed inside a glass tube. Basic electrical parameters of reed switch products reed switch characteristics pullindropout temperature effects40302010 0 10 20 30 40 5060 10 40 90 140 temperature c rate of change % here, because the copper coil wire expands and contracts with temperature, the pullin or operate point will vary with temperature by 0. It was invented at bell telephone laboratories in 1936 by walter b.
The reeds are hermetically sealed in cantilever form so that their free ends overlap and are separated by a small air gap. Media in category reed switches the following 20 files are in this category, out of 20 total. Reed switch and reed sensor activation although a reed switch can be activated by placing it inside an electrical coil, many reed switches and reed sensors are used for proximity sensing and are activated by a magnet. The reed switch, also known as reed contact or magnetic contact, is the ideal component for nontouch switching. A reed switch consists of two or three metal reed contacts blades that are hermetically sealed inside a glass tube containing an inert atmosphere. These dry reed switches have been hermetically sealed in a gasfilled glass envelope actuation is done with an electromagnet, a permanent magnet or a combination of both. Liquid level sensing using reed switch technology off on fig. How reed switches work magnetically operated switches. A float switch is a device used to detect the level of liquid within a tank or vessel. All reed switches are available as normally closed, normally open or bistable versions. Industrial switches free delivery possible on eligible purchases.
The reeds are sealed in the capsule in cantilever form so that their free ends overlap and are separated by a small air gap. The capacity range covers switching capacities up to 120 wva, switching voltages of almost 0 v to 10 kv acdc and switching currents of 0 to 3 a acdc. No load forward speed is 25 rpm, with a fast reverse switch that allows 60 rpm backoff to expedite jobs. Proper processing and proper annealing clearly are important steps in their manufacturing. They are made from two or more ferrous reeds encased within a small glass tubelike envelope, which become magnetised and move together or separate when a magnetic field is moved towards the switch. Many translated example sentences containing reed switch sensor spanishenglish dictionary and search engine for spanish translations. Kemet electronics sensors include current, thermal, and proximity detection sensors. The contacts are usually normally open, closing when a magnetic field is present, or. Auto switch guide reed switch solid state switch reed switch p 621 solid state switch p 643. A reed switch consists of two contacts that are hermetically sealed inside of a glass tube. In its simplest and most common form, it consists of a pair of ferromagnetic flexible metal contacts in a hermetically sealed glass envelope. Reed switch ord2 super ultraminiature j2r00123822 general description the ord2 is a small singlecontact reed switch designed for general control of lowlevel loads less than 24 v.
Auto switch internal circuit dz73 dz80 auto switch specifications weight dimensions grommet dz76 auto switch model 0. Normally open or closed contacts change states when a magnetic field is applied. Reed switches are sometimes also fitted to the spinning arms of dishwashers to detect when they jam, and in the thermal cutoffs in electric showers to stop the water heating to dangerous levels. This seal, while strong, may be damaged if proper handling is not used. Reed switch types are dry reed switch or mercury wetted reed switch. The second point is that reed switches have only a momentary action their contacts revert back to their original state as soon as the magnetic field diminishes. Know how to protect the reed switch electrical contact of the eicos sensors. The switch may be actuated by a coil, making a reed relay, or by bringing a magnet near to the switch. In your application, if you dont want to change to a different type of bulb or led, the best approach would be to use the reed switch contacts to operate a relay, or switch on a transistor, that then switches the power to the. Simulation tools developed by coto and used for customer support allow magnetswitch system designs to be rapidly prototyped. Jun 26, 2019 you can also get reed switches that work the opposite way. Theres a big difference with a microswitch matrix as used in sish chessboard project. Reed switch solid state switches switch pdf manual download.
Under non operating conditions the reed switch contacts do not touch. By utilizing the output voltage level of a redrock tmr magnet. Reed switch protection reed switch protection the hermeticallysealed reed switch used in gems level switches are extremely rugged and designed to operate reliably for many years 2 million cycles under ideal conditions. What is a reed switch, and which magnets operate them. An example of a reed switch s application is to detect the opening of a door, when used as a proximity switch for a burglar alarm. Auerswald comfort 2000 base handset reed switch2363. Stg offers a wide range of reed switches with a glass tube length from 7 to 50 mm. A magnetic contact switch consisting of two ferromagnetic blades are hermetically sealed inside a glass tube. Many translated example sentences containing reed switch sensor spanishenglish dictionary and search engine for. Separately, the switch will have a maximum voltage rating based on the insulation, separation between conductors etc. The switch can control a pump or be used as an indicator or alarm. The reed switches are packaged in several ways depend\. It contains two ferromagnetic nickel and iron reed elements in an evacuated, hermetically sealed glass tube to minimize contact arcing.
The term reed switch can refer to either the small glass electrical component as shown in the above drawing, or a complete assembly that is based around this type, or similar component. Consult the comus groups reed switches brochure on directindustry. In the presence of a magnet, the blades contacts close. Since the crocus magnetic switch is a solid state device, it has no. Reed switch direct mounting style dz73dz76dz80 24 v or lessac dc 100 v ac 48 v dc dc contact protection box cdp11 cdp12 contact protection box cdp11 cdp12 reverse current prevention diode most sensitive position most sensitive position for. Conductor circuit block conductor block including the internal reed switch is entirely. The crocus magnetic switch is much more robust than the reed switch. The glass tube is filled with a high purity inert gas. Reed switch 2 wire indicator protective circuit blue load indicator protective circuit brown blue load npnand connection with relay switch 1 brown switch 2 black blue load brown black blue.
The reed switch is an electrical switch operated by an applied magnetic field. In the diagrams on page 7 you can see several basic examples of reed switch operation with the use of a moving and stationary magnet. Reed switches come in various sizes, magnetic sensitivities, high power capabilities. Look up words and phrases in comprehensive, reliable bilingual dictionaries and search through billions of online translations. Once the magnet is pulled away from the switch, the reed switch will go back to its original position. Standex electronics offers the most comprehensive listing of magnetic reed switches that cover the majority of low power switching requirements. Reed switch 2 wire indicator protective circuit blue load indicator protective circuit brown blue load npnand connection with relay switch 1 brown switch. As the cups turn, they make a reed switch spin past a. Reed switches are commonly referred to as normally closed nc or normally open no types. The reed contacts are sealed within the glass tube within inert gas to maintain contact reliability. Anemometers with rotating cups have reed switches inside that measure the speed of the wind. What is driving these new applications is the ever broadening of new reed relay, for example, standexmeder offers a reed switch where the overall glass length is only 3.
D2rw sealed reed basic switch strongly watertight with a unique seal construction mechanical block magnet reed switch sealed resin d2rw internal structure internal reed switch construction enables to separate the conductor block and mechanical block. Reed switch article about reed switch by the free dictionary. Normally open type of thermal reed sensors are made by positioning the magnet assembly, slightly away from the reed switch contact overlap. To close reed switch contacts, two approaches are generally used. Current sensors are used to measure the amount of current flowing in a circuit and are available as low or highalternating current transformers, zerophase transformers, and directpulse current sensors. Nov 30, 2009 the reed switch is the core element in reed sensors, level sensors and reed relays. Reed switches the comus group pdf catalogs technical.
Contact your local coto technology representative with your special packaging needs. Many engineers have come across original contact elements contained in a glass shell because of the germetic shell sealed relays are not necessarily reed ones, but because of the fact that in a reed relay, a thin plate made of magnetic material functions as contacts. Standard packaging for uncut reed switches is a box containing 500 pieces. Magnetic reed switches are available at mouser electronics. We also offer accessories such as reed switch magnets. Information and translations of reed switch in the most comprehensive dictionary definitions resource on the web. It consists of a sealed glass envelope where there are two ferrous elastic reeds and is filled with inert gas called rhodium. They are typically manufactured with two ferromagnetic reeds contact blades, which are sealed in a glass capsule.
Reed switch is a kind of passive electronic switching component with contacts with a simple structure, small size and easy to control. The hsr0025 was designed to address the need for smaller electronic components in the medical and healthcare industries, specifically in hearing aids, pacemakers and other implantable devices, defibrillators, surgical instruments and testdianostic equipment. Our reed switches are manufactured to the highest standards ensuring long life and consistent performance. Any square containing a piece will have its reed switch activated. Hall effect sensors use all three wires while reed switches use only blue and brown. Reed switches, though mechanical in nature, ultimately transfer current and voltage when it completes a circuit. The crocus magnetic switch offers the same electrical functionality as the reed switch with additional advantages. The vertical reed switch is an alternative switching mechanism designed for use in specific onsite installations. Buy cylewet 15pcs reed switch with gilded lead normally open no magnetic induction switch electromagnetic for arduino pack of 15 cyt1065. Basic electrical parameters of reed switch products.
The best reed switches products and stock availability in the business, available online, on the phone or by fax from rs components. Its important to realize that there are numerous possibilities for a switch s orientation within a given magnetic. Reed switch basic information for beginners in electronics. Magnetic proximity sensors reed mp2018 sensors reed based magnetic proximity sensor in plastic flangemount package description the mp2 series sensors are reed position sensors. Reed switch magnet for use with reed switch description. Reed switches are available in a wide range of formats and contact ratings. Reed switch sensors are chiefly comprised of a magnet and a reed switch. A reed switch is a magnetically operated switch moving a magnet near to the switch will cause it to close if it has normally open contacts. The flowing current is broken up into the onstate switches, so indicator light becomes dark or may not turn on due to the lack of the current.
Since the reed switch carries out a switching function it must be directly or remotely connected to a. The crocus magnetic switch is a suitable replacement for the reed switch in many applications. The simplest magneticfield sensor is a reed switch. Reed switch magnetic reed switch deeter electronics ltd. A safety arm is always included, as is a carrying case. Reed switches and reed sensors find applications in vast areas, from simple position sensing in doors, to more complicated ones used in the military, to more sophisticated cellular phone radio frequency rf switching electronics and medical applications although every application cannot be listed here, we have broadly classified the them into various fields and have listed each of. Reed switches have unique switching capabilities making them an ideal. Spdt reed switch, also known as a form c reed switch. Reed switch there is no current leakage so that load voltage does not in crease at off. The basic reed switch consists of two flattened ferromagnetic reed blades, hermetically sealed in a dry inertgas atmosphere within a glass capsule, thereby protecting the contact from contamination.