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	Reed switch - Wikipedia, the free encyclopedia
		A reed switch is an electric switch that consists of a pair of ferrous metal contacts on metal reeds in a hermetically sealed glass envelope (A hermetic seal is an airtight seal).
		Reed switches are commonly used in mechanical systems as proximity switches as well as in door and window sensors in burglar alarm systems.
		In a reed relay, the electromagnet consists of a coil with the reed switch inside the coil.
	en.wikipedia.org /wiki/Reed_switch (262 words)

	Reed switch: Facts and details from Encyclopedia Topic (Site not responding. Last check: 2007-10-22)
		Reed switches are commonly used in mechanical systems as proximity switches as well as in door and window sensors in burglar alarm[Follow this hyperlink for a summary of this subject] systems.
		A mercury switch is a switch whose purpose is to allow or interrupt the flow of electric current in an electrical circuit in a manner that is dependent...
		A micro switch is a generic term used to refer to an electric switch that is designed to be actuated by the physical motion of mechanical devices and is generally...
	www.absoluteastronomy.com /encyclopedia/r/re/reed_switch.htm (562 words)

	Switch - Wikipedia, the free encyclopedia
		A switch is a device for changing the course (or flow) of a circuit.
		An example of a push-to-break switch is a button used to release a door held open by an electromagnet.
		Switching a load on or off from two locations (for instance, turning a light on or off from either end of a flight of stairs) requires two SPDT switches.
	en.wikipedia.org /wiki/Switch (2183 words)

	Hasco Components: Reed Switches/Magnets: Ideal for proximity reed devices and reed relays
		A Reed Switch is a simple, electronic, switching device that uses two pieces of wire to create a Form A style or three pieces of wire to create a Form C. Hasco’s reed switch blades are specially produced and sealed in a glass tube and then placed in an inert gas.
		To make a reed relay, a reed switch is covered with a coil that creates a magnet when the coil is energized which then closes the circuit.
		A reed relay is different from a general purpose relay in that the regular relays do not have their contacts sealed in glass.
	www.hascorelays.com /reed_switches.asp (394 words)

	What is a Magnetic Reed Switch?
		The ability of the seal to properly withstand a switch lead modification is dependent on several factors: the relation of the wire-to-glass dimensions, the length of the seal, the pull force or type of modification to be performed, and the distance and direction of the mechanical force in relation to the seal itself.
		Life Expectancy of a reed switch is influenced by the contact layer, the wire diameter, the load, the load circuit parameters and the applied magnetic field.
		This enables the reed switch to be used as an interface to a transient or integrated circuit.
	www.britestuff.citymaker.com /page/page/1615076.htm (914 words)

	How It Works: Reed Switch Motor
		I used a reed switch to sense the position of the rotor and to change the magnetic field of the stator at appropriate times.
		When the magnet is moved away from the reed switch the contacts demagnetize, separate, and move to their original position.
		Reed switches are very reliable and last as long as 3 billion operations if used properly.
	www.simplemotor.com /rsmotor.htm (703 words)

	[No title] (Site not responding. Last check: 2007-10-22)
		The mode switch 5 has a common terminal and two switched terminals labelled R and T. When the mode switch 5 is connected to the R terminal, one of the relay test sub-circuits will operate in the relay test mode, depending on the position of the circuit switch 7.
		Alternatively, the distance of the reed switch 9 from the arrow 33 may be made equal to the distance of the coil 41 from a particular manufacturers marking on the relay.
		A relay test device for testing the state of a relay switch, the device comprising: a sensor for sensing the presence of an electromagnetic field emitted from a switch- controlling element of a relay; and an indicating device for indicating the presence of the electromagnetic field, in response to a sensor output signal.
	www.wipo.int /cgi-pct/guest/getbykey5?KEY=01/92905.011206&ELEMENT_SET=DECL (2605 words)

	[No title] (Site not responding. Last check: 2007-10-22)
		Reed switches are the major component in reed sensors as well as reed relays.
		Most Hamlin reed switches have a temperature rating of –40°C to 125°C. However, reed switches can operate from less than –270°C to over 400°C. This application note explains the issues to be aware of when using Hamlin reed switches beyond their rated temperatures.
		Reed Switch sensitivity is normally measured by placing it inside a test coil and using a unit of measure called an Ampere-turn (also AT or AW or At).
	www.hamlin.com /index.aspx?tabindex=3&tabid=7&mid=33099 (749 words)

	Reed Switch and Reed Sensor FAQ
		The basic reed switch consists of two identical flattened ferromagnetic reeds, sealed in a dry inert-gas atmosphere within a glass capsule, thereby protecting the contact from contamination.
		The reeds are sealed in the capsule in cantilever form so that their free ends overlap and are separated by a small air gap.
		When a magnetic force is generated parallel to the reed switch, the reeds become flux carriers in the magnetic circuit.
	www.reed-sensor.com /Notes/General_Reed_Switch_Theory.htm (644 words)

	Aleph International
		The reed switch consists of a pair of flexible reeds made of a magnetic material, and sealed in a glass tube filled with inert gas.
		The switching elements of the reed switch are hermetically sealed in an inert gas atmosphere, so that they are never exposed to the external environment.
		The reed switch employs no sliding parts, so there is no fatigue related to degradation in the quality of the materials used, ensuring a virtually unlimited mechanical life.
	www.aleph-usa.com /rs_main.asp (298 words)

	Reed Switch Sensors, Proximity Switches, Magnetic Proximity, Magnet
		Reed Proximity Sensors / Switches (sometimes refereed to as magnetic sensors) are inherently reliable due to their simple construction and sealed reed switch contacts.
		The reed switch will change state when the actuator magnet comes into close proximity to it, there does not have to be any physical contact between the reed switch and actuator.
		Both the reed switches and actuator magnets are housed in rugged cases and are suitable for use in harsh environments, some of the switches are able to switch heavy loads directly.
	www.arun-electronics.co.uk /sensor_reed.htm (237 words)

	Reed Switch Applications in Cars and Trucks
		Reed sensors used in such applications fair well because of their inherent hermetically sealed nature and are free from moving mechanical parts.
		Miniature reed relays, capable of switching high loads are used in automobile climate control circuits to switch on or switch off the heater and coolers.
		A reed sensor is mounted under the seat and a magnet fitted into the foam of the seat actuates the reed sensor whenever a passenger is present.
	www.reed-sensor.com /Applications/Automotive_applications.htm (1512 words)

	Aleph International - Reed Switches, Features, Construction, Magnet Patterns
		This enables the reed switch to be used as an interface to a transistor or integrated circuit.
		The contact area of each reed is plated with a noble metal, such as Rhodium or Ruthenium, to provide the switch with stable characteristics and long life.
		Application of a magnetic field, generated by a permanent magnet or a coil, to the reed switch causes both reeds to be magnetized.
	www.ceejay.com /ales01.html (358 words)

	Aleph International (Site not responding. Last check: 2007-10-22)
		There are two versions of the G sensor: the mercury switch type and a capacitive type which detects the change of G force in relation to the change of capacitance.
		Reed switches combined with coils are able to detect damaged lamps, including burnt-out headlights and rear lights.
		A reed switch type proximity sensor detects whether the door is open or closed and can be linked to an alarm system or internal lighting for security and convenience.
	www.aleph-usa.com /as_main.html (327 words)

	Aleph International - Reed Switch Application Notes - Important
		When mounting a reed switch on a pcb, it is recommended to form the leads and provide adequate spacing between the pcb and the reed switch, or to drop the reed switch into an opening (cutout) in the pcb (see Fig.
		When using reed switches for inductive loads such as motors, relay coil, solenoids, etc., the contacts will be subjected to high induced voltages during opening of the contacts (load circuit).
		When reed switch and its actuating magnet or coil are located near sources of strong magnetic interference such as steel plates, transformers, etc., the reed switch operational characteristics will be altered and false operation is likely.
	www.ceejay.com /ales10.html (610 words)

	so: Directron Reed Switch w/ Magnet & both NO and NC Positions, -V-Best Computer Online Store Houston Buy Discount ...
		The switch is actuated by an externally generated magnetic field, either from a coil or permanent magnet.
		This reed switch is a dual-purpose device which may be used with normally open or normally closed circuits.
		As a rule, the switch part is installed on the stationary part (usually the frame) of the window or door and the magnet on the door or window itself.
	www.directron.com /reed.html (806 words)

	How It Works: Reed Switch Motor with Transistor
		reed switch motor is one of the simplest motors and works very well under low voltages.
		A spark is created because the reed switch is connected directly to the electromagnet, which is an inductive load.
		The switching ability of PNP power transistors is used in these motors, but NPN transistors may be used as well.
	www.simplemotor.com /tmotor.htm (845 words)

	Reed Switch Installation Instructions
		Optimal reed switch location is right inside the track rail and as close to the path of a car’s traction magnets as possible.
		Also, reed switch placement on a track layout should be somewhere that a car is not likely to de-slot such as at the end of a long straightaway for example.
		Under normal circumstances reed switches are maintenance free, but do not use a permanent adhesive to install them in the unlikely event of replacement.
	www.gofastest.com /Reeds.htm (297 words)

	MachineDesign.com: Switch Tips: Reed switch basics (Site not responding. Last check: 2007-10-22)
		A reed switch gets its name from the use of two or three thin metal pieces, called reeds, with plated contacts at their tips and spaced a small distance apart.
		Another typical scenario for a reed switch employed in position sensing is to either move the magnet near the switch or slide ferrous metal between the switch and the magnet, thereby toggling the contacts.
		A point to note is that reed switches have a resonant frequency that relates to the length of the reeds.
	www.machinedesign.com /ASP/strArticleID/57254/strSite/MDSite/viewSelectedArticle.asp (540 words)

	Electronics in Meccano - Reed Switches
		Reed switches are actuated by the field from an external permanent magnet or electromagnet placed in close proximity.
		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.
		Advantages of reed switches to the Meccano modeller are their small size, which makes them easy to mount and unobtrusive, and the fact that the operating force required to operate the switch is very small, thus doing away with cumbersome cams or cranks.
	www.eleinmec.com /article.asp?23 (688 words)

	EAC Electronics - Reed Relays, SMD, DIP, SIP, Tubular, Standard, and Custom
		Reed relay life is much longer at reduced power loading.
		End life is totally unpredictable if one considers that reed relay manufacturers approve many reed switches from many sources for use in standard products, that while meeting physical requirements for relay manufacturing may not all perform the same.
		Reed relay design is then frozen so that only the approved switch is used in the end product.
	www.eac-electronics.com /relayb1.html (545 words)

	Tane Alarm Products - Magnetic Contacts, Alarm Switches, Sirens & B-Connectors (Site not responding. Last check: 2007-10-22)
		The reed is in the brake fluid box and a magnet in on a float measuring brake fluid for ABS systems to work.
		The reed is open with the magnet near it and closes with the magnet moved away.
		A reed switch is a highly reliable device because the blades are sealed in glass.
	www.tanealarm.com /InfoPages/MagneticContacts.asp (1216 words)

	Application (Site not responding. Last check: 2007-10-22)
		When switching charged capacitors (including cable capacitance) a sudden unloading can occur, the intensity of which is determined by the capacity and length of the connecting leads to the switch.
		The sensitivity of a reed switch is a measurement of the magnetic energy required to operate the switch.
		Manufacturers of reed switches will set their machines such that they aim to produce a particular operate AT but, due to tolerances in materials, machinery and operator control, the switches produced will have a range of operate AT.
	www.crydom.co.uk /Webpages/reed_switch-application_notes.htm (680 words)

	Magnetic reed switches and their uses (Site not responding. Last check: 2007-10-22)
		If you need to bend or shorten the reed switch wires (not recommended) you must again grip the wire close to the glass with pliers and bend or cut the wire furthest from the glass.
		The circuit (above) uses a reed switch (S1) and a magnet (not shown) to detect when a door or window is open.
		The reed switch is normally held closed by the proximity of the magnet but when it moves away the reed switch contacts open and the circuit causes a buzzer to sound for a couple of seconds only (duration determined by C2).
	www.satcure.co.uk /car/reed.htm (748 words)

	Madison : Reference : Reed Switch Electrical Data
		Reed switches are rated for a steady-state current.
		If the switch is connected to a 12 V circuit that spikes to 2 Amps and runs at a steady state of 1 Amp, the power spike exceeds the switch rating although the steady state running power is 12 Watts.
		Level switches with two or more floats are often used as part of a control system for pumps and other filling devices.
	www.madisonco.com /reference/electrical.htm (953 words)

	Reed Switch Applications in Domestic and White Goods
		In addition to switching on the heaters, thermal reed switches can be used to cut in and cut out the heaters to keep the water at a comfortable temperature.
		Reed switches are used in bi-directional vibration sensors.
		A reed sensor array inside the pedal housing with a magnet mounted under the pedal, actuates each of the the reed sensors one by one as the pedal is depressed.
	www.reed-sensor.com /Applications/Domestic_and_white_goods.htm (1370 words)

	Reed Switch suits compact environments., Reed Switch Developments Corp.
		switch operates are a magnetic field causes the contact of the switch to open or close and in turn an electrical circuit will be broken or completed.
		Reed Switch Developments Corp. works hard to make certain that our customers' particular requirements are matched specifically to the best reed switch for their application", said Richard Berns, Reed Switch Developments Corp. Vice President of Sales and New Product Development.
		Reed Switch Developments Corp., is a privately held supplier and custom manufacturer of Reed Switch assemblies, magnets and bare reed switches in numerous shapes and sizes for a wide variety of industries.
	news.thomasnet.com /fullstory/10386 (888 words)

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