What is a reed switch?
Reed switch is the abbreviation of dry reed switch. It is a passive electronic switching element with contacts. It has the advantages of simple structure, small volume and easy control. Its housing is generally a sealed glass tube. There are two iron elastic reeds and an inert gas called a metal crucible. At ordinary times, two reeds made of special material in the glass tube are separated. When there is a magnetic substance near the glass tube, the two reeds in the tube are magnetized and attracted to each other under the action of the magnetic force lines of the magnetic field, and the reeds are sucked together so that the circuit connected to the node is connected. After the external magnetic force disappeared, the two reeds were separated due to their own elasticity and the lines were disconnected. Therefore, as a circuit switching device controlled by a magnetic field signal, a reed switch can be used as a sensor for counting, limiting, etc. (in a security system, it is mainly used for the manufacture of door magnets and window magnets), and also It is widely used in various communication devices. In practice, the permanent magnets are usually used to control the turning on or off of the two metal plates. Therefore, they are also called “magnetronsâ€.
The reed switch is also called a magnetron. It is similar to a Hall element, but its principle is different. It is a kind of switching element controlled by a magnetic field signal. It can be used to detect the state of a circuit or a mechanical motion without a magnetic disconnect.
Reed switch features and applications:
First, characteristics:
The dry reed pipe has a compact structure and a small weight, and can be installed in an extremely limited space, and is very suitable for use in miniaturized devices.
The switching elements of the dry reed switch are hermetically sealed in an inert gas atmosphere and will never come into contact with the external environment, and have a long working life.
Dry reeds do not use sliding elements, so metal fatigue associated with all metal degradation does not occur, ensuring virtually unlimited mechanical life.
Second, application:
Reed switches are well received in mobile phones, program-controlled switches, copiers, washing machines, refrigerators, cameras, disinfection cupboards, door magnets, window magnets, electromagnetic relays, electronic scales, level gauges, gas meters, water meters, etc. application.
Reed pipe principle and structure
What is the principle of reed switch and reed switch work? - Zhang Xinfang - Zhang Xinfang's blog
What is the principle of reed switch and reed switch work? - Zhang Xinfang - Zhang Xinfang's blog
What is the principle of reed switch and reed switch work? - Zhang Xinfang - Zhang Xinfang's blog
What is the principle of reed switch and reed switch work? - Zhang Xinfang - Zhang Xinfang's blog
What is a reed relay?
The reed relay is an electromagnetic breaker with a sealed contact. Reed relays can reflect signals such as voltage, current, power, and current polarity, and are widely used in detection, automatic control, and computer control technologies. Reed relays are mainly composed of dry reeds and excitation coils. Reed relay has: simple structure, small size.
Reed Relay An electromagnetic circuit breaker with sealed contacts. Reed relays can reflect signals such as voltage, current, power, and current polarity, and are widely used in detection, automatic control, and computer control technologies. Reed relays are mainly composed of dry reeds and excitation coils. The dry reed (contact) is sealed and made of iron-nickel alloy. The contact portion of the tongue is usually plated with precious metals (such as gold, rhodium, palladium, etc.), with good contact and excellent electrical conductivity. The contacts are sealed in a glass tube filled with an inert gas such as nitrogen, which effectively prevents the contamination of dust, reduces the corrosion of the contacts, and improves the reliability of operation.
After the coil is energized, the free ends of the two reeds in the tube are respectively magnetized into N and S poles to attract each other, thereby turning on the controlled circuit. After the coil is de-energized, the dry reed is separated by its own elastic force and the line is cut off.
Reed relay has: simple structure, small size. Low suction power, high sensitivity, general pull-in and release time are within 0.5 ~ 2ms. The contact seal is not contaminated by dust, moisture, and harmful gases. The moving piece has a small mass, a small stroke, and an electrical contact life of about 107 times.
Reed relays can also be driven with permanent magnets, reflecting non-electrical signals, used as limit and stroke control, and non-electricity detection. The main component is the reed relay water level indicator for reed relays. It is suitable for water level control and water level alarm for open tanks such as water tanks, water towers, and pools in industrial and civil buildings.
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