Ultraminiature reed switch series manufactured by standex electronics are some of the smallest switches currently available in the world. A typical reed switch flow meter works something like this. Note 2 regarding the lead wire length, refer to page 6167. 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. Reed switches are small electrical switches that are activated by an applied magnetic field. Maximum switching voltage is less than the breakdown voltage. In addition they are suitable for control of small relays and solidstate relays. It is turned on by bringing a magnet near to the switch. Reed capsules switches from coto, this ri23 series micro dryreed switch contains two magnetically actuated reeds hermetically sealed in a glass envelope, the ri23 series reed switch boasts an excellent life expectancy and is suitable for general purposes. The reed switch itself is totally isolated from the media. 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. The two wires are formed into reeds by flattening one end. Switch front panels this section shows the design of the front panel for each model. Electronics series datasheet mk10 series reed sensors features.
Reliability testing by reliability testing we mean determination of the life characteristic of the. Reed switches tolerate high humidity, sea salt spray, toxic gases, dangerous chemicals, and dust or partical laden atmospheres. The switches are used to activate the device from outside the waterproof. The crocus magnetic switch is a suitable replacement for the reed switch in many applications. Theres a pipe through which liquid flows 1 with a paddle wheel mounted inside it 2. A reed switch is an electrical switch that changes its position via magnetism. With a focus on technical support and personalized customer service, reedrex is positioned to help engineering groups maximize reed switch attributes. 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 the types. The reed ends are carefully aligned with a small overlap and then permanently sealed inside the glass capsule. It is absolutely imperative that reed switches are not dropped. Once the magnet is pulled away from the switch, the reed switch will go back to its original position. Then, as it spins around and presents its opposite pole 5, the. The overlap or contact area of the reeds is coated with special metals such as ruthenium.
Reed switches are not suitable for control of inductive loads such as electric motors, even very small dc motors. They are typically manufactured with two ferromagnetic reeds contact blades, which are sealed in a glass capsule. Reed switches come in various sizes, magnetic sensitivities, high power capabilities, high voltage capability, contact con. Reed switches are used in the automobiles as position sensors, parking sensors and movement sensors. Reed switches and reed sensors in lifts, hoists, door and window security, hands free emergency lamps, deep bore liquid sensing, settlement monitoring, blowers and ducts, electric chairs and beds, tamper proofing etc. Bernstein has extended its range of electromechanical magnetic switches with electronic versions which operate according to the hall and magnetoresistive. Note 3 under 5 ma, the strength of the indicator light is poor. Smart sensors can be designed to detect angle, shock, magnetic field or ferrous metal, acceleration and gforce. Reed capsules switches from coto, this ri23 series micro dry reed switch contains two magnetically actuated reeds hermetically sealed in a glass envelope, the ri23 series reed switch boasts an excellent life expectancy and is suitable for general purposes. Reedrex is a factory authorized distributor of high quality kofu reed switches and standexmeder reed sensors and relays. To minimize contact arcing, it is imperative to select a reed switch with the appropriate features including vacuum, inert gas or pressurized inert gas. A great handson book that will kickstart your electronics hobby. Atfs75020 model figure 1 illustrates the front panel of the atfs75020 switch. Reed switches are ideal for computer or plc applications, and for all types of signalling in electronic controllers, timers and telemeter systems.
Mercury wetted reed switches are not covered by this standard due to their possible environmental impact. Hall sensors are generally used to measure the speed of intelligent vehicles and count assembly lines, while reed switches are often used to detect the existence of a magnetic field. Several of the projects in this book involve hooking up reed switches to arduinos and pis there are complete instructions for a reedswitch door buzzer alarm. The two reed type has normally open no contacts which close when operated, and the three reed type is a changeover, i. Mercury wetted reed switches are not covered by this standard due. A reed switch is also a sensor used to detect the magnetic field. The tworeed type has normally open no contacts which close when operated, and the threereed type is a changeover, i. We manufacture a range of ruthenium sputtered, inert gas filled, nonpressurized dry reed switches with tin plated leads, for switching as high as 120 w. Theres a simple introduction to reed switches in chapter 3. Reed switch applications in construction and security. Reedschalter auch reedkontakte sind im glasrohr hermetisch eingeschmolzene. Buy cylewet 15pcs reed switch with gilded lead normally open no magnetic induction switch electromagnetic for arduino pack of 15 cyt1065.
Reed switches do not need to be powered in the off position. They can tolerate wide swings in temperature and to 30gs of shock. These dryreed switches have been hermetically sealed in a gasfilled glass envelope. If you prefer, they can be placed alongside a coil and actuated when a.
Series 1750 reed proximity switches are available as either 1030 vdc or 110120 vac models for simple interfacing to sequencers and programmable controllers. Reed switches come in various sizes, magnetic sensitivities, high power capabilities, high voltage capability, contact. Know how to protect the reed switch electrical contact of the eicos sensors. Reed switches were formerly used in the keyboards for computer terminals, where each key had a magnet and a reed switch actuated by depressing the key. Jun 26, 2019 several of the projects in this book involve hooking up reed switches to arduinos and pis there are complete instructions for a reed switch door buzzer alarm. They are very delicate, as are all reed switches glass. Application reed switches are in use in the following areas. Reed switch simple english wikipedia, the free encyclopedia. August 20 mit einigen kleineren anpassungen lassen sich nach einschatzung des herstellers auch 10. These dryreed switches have been hermetically sealed in a gasfilled glass envelope actuation is done with an electromagnet, a permanent magnet or a combination of both. Applications include miniature reed relays, keyboards, etc. Industrial switches free delivery possible on eligible purchases.
If you try to bend the lead on a reed switch without doing this, the tiny glass will crack. A common application of a reed switch is to detect the opening of a door. Atfs75020 switch front panel atfs75028 model figure 2 illustrates the front panel of the atfs75028 switch. Mercury wetted reed switches the comus group pdf catalogs. Hyr 1501 for 110 vac high power switches switching power rating between 20 and 70 watt. Pic gmbh reed switches, smd reed switches, sensors and magnets, switching the smart way. The switches can be provided as normally open normally closed or changeover contacts. Reed switch pdf normally open reed switch and its component makeup. Ultraminiature switches with glass capsule length of 7 to 12mm. How reed switches work magnetically operated switches. As the liquid flows, the paddle spins and makes a magnet rotate 3. Reed switch magnetic reed switch deeter electronics ltd. Standard packaging for uncut reed switches is a box containing 500 pieces.
A reed switch consists of two or three metal reed contacts blades that are hermetically sealed inside a glass tube containing an inert atmosphere. A reed switch is used as sensor and the initiator is an impeller fitted with a magnet, which creates one switching pulse per technical data contact rating cable. They seem so get stuck in closed position in some cases. If you prefer, they can be placed alongside a coil and actuated when a current is applied to the coil. In the presence of a magnet, the blades contacts close.
This guide provides an introduction to magnetic sensing and. The life expectancy of a reed switch refers to a kind of load to be used. As the magnet is brought into the proximity of the reed sensorswitch, the device activates. Reed switches of the highest reliability are applied in our level switches, flow switches and their life expectancy can reach above two million operations. If the magnet is an electromagnet, it is a reed relay. Inexpensive proximity sensor with internal reed switch, that is turned on and off by change of magnetic field strength vertical, horizontal or longitudinal movement. The reed switch is an electrical switch operated by an applied magnetic field. In general, applications switching above 250 volts require a reed switch with an internal vacuum or pressurized gas. As the magnet is brought into the proximity of the reed sensorswitch, the.
Consult the comus groups mercury wetted reed switches brochure on directindustry. A float switch is a device used to detect the level of liquid within a tank or vessel. Actuation is done with an electromagnet, a permanent magnet or a combination of both. Configurations include normally open or normally closed.
When installing on a printed circuit board, either lift the reed switch above the board surface, as shown in fig. Reed switch 570 diehl metering pdf catalogs technical. May be used for directly switching power line voltages, i. Reeds switches are hermetically sealed contacts actuated by a magnetic field.
Reed switches are hermetically sealed, durable, proven, and precise. Proximity sensors are based on reed switches which are actuated without direct physical contact. Buy your pta 47030 from an authorized comus distributor. Components 1 sunfounder uno board 1 usb data cable 1 reed switch module. Depending on this original contact coniguration, the contacts will either complete or interrupt a circuit when actuated by a magnetic ield. They break easily the casing of the reed switch body is typically made of glass and is very fragile. Reed switches are available in a wide range of formats and contact ratings. Electric and electronic pedal keyboards used by pipe organ and hammond organ players often use reed switches, where the glass enclosure of the contacts protects them from dirt, dust, and other. Ermec has reed switches, reed sensors, level sensors. Reed switch glass capsule, two ferromagnetic nickeliron wires. Series 1750 reed proximity switches are available for use on most phd products and provide mounting versatility and save space with a compact low profile design. The switch can control a pump or be used as an indicator or alarm. This reed switch is produced in germany and offers a unique flat lead construction.
Reed switches are suited to applications in radio frequency operation. Our reed switches can be used in a wide range of applications, from low level signal switching in mobile phones, to temperature sensing in heating appliances, and high wattage switching in reed relays. When you bend the leads, clamp the wire with tweezers and use it as a mandrel to bend it. Reed switch types are dry reed switch or mercury wetted reed switch. Normally open no, normally closed nc and form c which has both no and nc. Testing reed switches and relays for reliability cont. This actuates the reed switch with its magnetic field without causing any wear. Magnetic alarm reed switch magnetic alarm reed switch. Reed switches and reed sensors in lifts, hoists, door and window security, hands free emergency lamps, deep bore liquid sensing, settlement monitoring, blowers and.
Switching status remains stable after a magnetic field disappears until a magnet with opposite polarity approaches. The objective is to find a modeling function that closely fits the available data, and can used for interpolation or judicious extrapolation to find estimates of the mcbf and other reliability statistics. The crocus magnetic switch offers the same electrical functionality as the reed switch with additional advantages. As the magnet is brought into the proximity of the reed sensor switch, the device activates. Contact your local coto technology representative with your special packaging needs. The reed blades act as magnetic lux conductors or a magnetic antennae.
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