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

Reed sensors in Accurate fuel level sensing

Reed switches in fuel level sensing
Fuel Level

Automobile fuel gauges are used to display the volume of fuel in the tank. These gauges require a potentiomteric feedback from within the fuel tank which is triggered by a magnet in a foamed float. For the PCB to generate such an output, reed Sensors need to be combined with resistors. More information about the design of such PCB circuits can be seen here. The space available in larger automobiles such as trucks is more, but for cars, the fuel tank is usually long and wide with a very short height. This mean that the design of the PCB would need to be very compact, with reed switches mounted very close to each other to ensure that at any given time, at least one reed switch is always in an actuated state. Specially designed reed sensors with a high differential need to be used and are combined with integrated resistors. For larger fuel tanks however, standard reed switches with a regular 45% differential can be used. These PCBs give out a potentiometric feed back across two outputs as a foamed magnetic float moves along its height. The PCB tracks can be designed in such a way that a full tank gives high resistance and an empty tank gives low resistance, or vice versa. Being hermetically sealed devices, reed sensors are the best devices to use in explosive environments such as fuel tanks. Suitable products:

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.

R3 Miniature SMD Reed Sensor

Miniature Reed Sensor These miniature SMD reed sensors are designed for low power, high speed switching applications, and have a cost advantage over the Continue reading ->

Jun 7, 2021

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

IR-xxxx Reed Sensor with Integrated Resistor

Reed sensor with integrated resistor IR-xxxx Reed Sensor DrawingIR-xxxx Reed Sensor PCB Layout Drawing starFeatures10W Contact Rating. Includes integrated Resistor. Continue reading ->

Oct 30, 2020