Reed Relays and
Electronics India Limited
Manufacturer of Reed Switches, Reed Sensors and Reed-based products
Reed Relays and Electronics India Limited Incorporated in 1971

Magnet sensors in Low fluid level monitoring

Reed switches in low fluid level monitoring Automobiles these days need to provide a wide range of information on the various liquid levels ranging from wind screen viper fluid, brake oil, power steering oil, radiator coolant and other. Reed sensors are the only devices that are hermetically sealed and completely safe to use even inside fuel tanks and they are molded, which means they can withstand higher shock and vibration limits that automobiles require. Detecting the actual volume of a liquid required additional PCB, but detecting only the low level is much simpler. Reed Sensors also have the added advantage of withstanding higher temperatures without very little or no change in actuating distance when the right magnets are used for actuation. Tanks are fitted with a foamed magnet float attached to the inside stem of the cap and are usually mounted in the middle of a tank so movement of the liquid when the vehicle is in motion does not affect the measurement much. A reed sensor is then mounted outside the tank at the near empty level. The magnet and reed sensor can be combined into one float switch which is inserted directly into the tank. The signal is then used to trigger an LED on the driver information panel. Some automobile manufacturers also mount the reed sensor to sense a full tank instead of an empty tank, because it will be easier to detect a malfunction.

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