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 switches and Reed sensors in Pressure Gauges

Reed switches in bourdon tube pressure gauge
Pressure Gauge

A pressure gauge is an instrument used to display the pressure of a fluid. The most widely used type of pressure gauge is the Bourdon gauge which uses a flattened tube that tends to straighten or regain its circular form with change in pressure. The flattened tube is directly coupled with the a mechanical arm that directly drive the needle of the display.

Legacy Bourdon tube pressure gauges are fitted with a magnet on the Bourdon tube itself so that as pressure increases, the magnet moves along a circumference. A circular PCB with multiple reed switches mounted from radial center to circumference, wired to generate a potentiometric two wire feedback is triggered by the magnet as the pressure changes. Circuits for such PCBs follow the same principles of level sensors, which is reed switches combined with resistors, and more information can be found here. This sort of assembly is cost effective and accurate. An added advantage in such gauges is that multiple alarm points can be set and the digital outputs can be saved to a web server or to a smart phone.

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 A Position Sensing Application is one which requires the end position of a movement...Continue reading ->

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.

R2 Standard size SMD Reed Sensor

Standard Size Reed Sensor Omni polar, normally open (NO), 19.5 mm SMD and low-profile SMD pitch, 10 W...Continue reading ->

MM-1018 Micro Miniature Reed Switch

Micro Miniature Reed Switch Size This is durable and reliable, Form A type 10.0 mm Micro Miniature reed switch...Continue reading ->

MS-105 Miniature PCB Mountable Reed Sensor

Miniature pcb mountable This micro miniature PCB mountable reed sensor is designed for switching 10W. The sensors...Continue reading ->

SM-1322 Sub Miniature Reed Switch

Sub Miniature Reed Switch Size The SM-1322 is a robust and reliable, Form A type 13.0 mm Sub Miniature...Continue reading ->