A reed relay consists of a reed switch and coil fitting into a housing which could be plastic, metal or moulded. Reed relays generally have a faster response time than electro-mechanical relays, lower coil consumption and are smaller in size. Furthermore, the switch is sealed in a dry inert atmosphere preventing the ingress of contaminants.
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Solid state relays(ssr) manufactured by the comus group of companies are sold around the world. The sign, with no moving parts, means that solid state relays have an almost unlimited life expectancy compared with electromechanical relays. With no mechanical parts there is no contact bounce, no sparks and no mechanical wear making solid state relays the natural choice in working environments where these features are important.
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A reed switch consists of two ferromagnetic and specially shaped contact blades(reeds) positioned in a hermetically sealed glass tube with a gap between them and in a protective atmosphere. The plated contact surfaces are isolated from the outside environment, which protects the contacts from contamination. Reed switches are available as form a (normally open) and form c (changeover), and are operated using a magnetic field generated by either a permanent magnet or current-carrying coil. The features that make the reed switch a valuable tool include compact size, low weight, quick response time, long life and low cost. Some common applications are: reed relays, automotive sensors, robotics sensors, security sensors and toys and games. They are also available in moulded packages affording protection from damage and in surface mount styles.
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These switches have a normally open contact which closes when the switch reaches the acceleration/activation level.
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Float switches are used to monitor liquid levels by opening or closing when a desired action point is reached. A variety of types are available using mercury and non-mercury tilt switches and, also, permanent magnets and reed switches. Common applications include sumps, pump-control systems, bilge pumps, below ground vaults and irrigation systems.
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Motion sensors (also known as vibration sensors )are very similar in design to tilt switches; in fact, some tilt switches are used as motion sensors. The sensor will be in one condition (open or closed) at rest. When it is subjected to motion it will continually change state as long as it remains in motion. Some common applications include: anti-theft devices, man-down alarms to detect non motion, smart appliances to turn off power when not in use and portable equipment to do the same.
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Tilt switches are used to sense movement (tilt) of a device above and below a horizontal axis. A typical use is in a thermostat. A glass mercury switch is mounted to a bi-metallic spring which expands and contracts with temperature. As the spring moves, the switch contacts pass through the horizontal plane, opening or closing to operate the furnace or boiler. The angle through which the switch must move for proper operation -the differential angle- is measured from the point of just make to just break; it is specified as a maximum. When selecting a tilt switch, it is important to ensure that the operating mechanism can move the switch through an angle greater than the differential angle. Some additional applications include: level controls, appliances, security alarm systems, toys and games, float switches and water-treatment equipment (non-mercury).
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Tip over switches sense tilt over 360 degrees of a vertical axis. A common use is in portable heaters used in the home to prevent electrical shock or fire. When the heater tilts more than a specified angle, the switch operates turning the heater off. This angle, called the operating angle, describes the angle from vertical to the point of contact operation, subject to a tolerance, ie:45 degrees plus-minus 10 degrees(35 degrees to 55 degrees). Both normally closed(tilt to close) switches are available. Some additional applications include: portable lamps, pc anti-theft devices, vending-machine alarms and machinery security systems.
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The hbs line of reed switches is the comus groups answer to the market demands for a lower cost reed switch that is still capable of handling high voltage applications. The hbs line of reed switches is ideal for certain markets such as medical applications; for example defibrillation equipment where high reliability and excellent quality is absolutely essential.
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Proximity switches and sensors use a reed switch and a permanent magnet. Each is encased in a plastic housing for protection and ease of mounting. A classic use is sensing the opening of a door in a security system. A reed switch in the jamb and a permanent magnet in the door complete a circuit when the door is closed. Opening the door breaks the circuit.
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