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
Fluid Low Level

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.

Application Classification

Applications are classified as Position Sensing, Pulse Counting, Electromagnetic or Relay, Temperature Sensing or Magnet Biasing types. This application is classified as follows and the link gives more information on best practices to help select the most suitable AT band and matching magnet.

Position sensing Type
Position sensing Position Sensing type application When an application requires the end position of a movement sensed, or the sensing of a part when it Continue reading ->

Nov 7, 2020

The Reed Switches and Sensors used in such applications need to be robust, durable and efficient in meeting a high life expectancy. Our engineers work hard in life testing our products under various conditions, and our intention is to ensure end product durability and life. Although we wouldn’t want to restrict any of our products for use in only certain applications, the recommended products for use in this application are listed below.

MM-1018 Micro Miniature Reed Switch
Micro Miniature Reed Switch Size This 10.0 mm long, Form A type Micro Miniature reed switch is designed for moderate power, low load applications. The fast operate Continue reading ->

Nov 8, 2022

MS-105 Miniature PCB Mountable Reed Sensor
Miniature pcb mountable Drawing of MS-105 Reed SensorDrawing of MS-105 PCB Pad Layout starFeatures10W Contact Rating. 12.7 mm PCB Pitch. Normally Open Continue reading ->

Oct 30, 2020

SM-1322 Sub Miniature Reed Switch
Sub Miniature Reed Switch Size This Form A type SM-1322 Sub Miniature Reed Switch is built with a 2.25 mm diameter glass with a higher wall thickness for better glass to Continue reading ->

Nov 8, 2022