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 level sensing of fluids

Reed switches in fluid level sensing
Fuel Gauge

In ships and yachts, it is not only necessary to monitor the exact volume of fuel, but also the volume of the sewage and the drinking water tanks. These gauges work on the same principle as a fuel gauge and require a potentiometric feedback from within the tanks.

Reed Sensors need to be combined with resistors, on PCBs that re designed to generate this sort of output. More information about the design of such PCB circuits is available here.

As on boats and ships, there is a space restriction, tanks are usually design to fit these small spaces and are long and wide but very short in height. This mean that the design of the PCB would need to be very compact, with reed switches mounted very close to each other. Specially designed reed sensors with a high differential need to be used and are combined with integrated resistors. These PCBs to 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. For sensing fluids such as sewage, a perforated housing can be fitted outside the float assembly so that semi solids do not come near the float and obstruct its path.

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

R2E Latching / Bi-stable SMD Reed Sensors
R2E Latching / Bi-stable SMD Reed Sensors Drawing of R2E-S Latching SMD Reed SensorR2E-S Gull-wing SMD Formed Reed Sensor Pad LayoutDrawing of R2E-F Latching SMD Reed Sensor Continue reading ->

Oct 30, 2020

UM-0018-H Ultra Miniature Reed Switch
Ultra Miniature Reed Switch Size 7 mm These highly sensitive, Ultra Miniature Form A reed switches are designed for low power, high speed switching applications and Continue reading ->

Nov 8, 2022

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