Blowers Use Reed Switches to detect drop in Flow-rate

Blowers, also known as centrifugal fans, find extensive application across various fields for air or gas movement, serving purposes ranging from creating vacuum or exhaust in a space to generating positive pressure in clean rooms and similar environments. In such critical applications where maintaining specific pressures or ensuring the removal of harmful gases is imperative, monitoring the gas flow rate becomes crucial.

In these systems, Reed Switches are commonly employed within blowers and vacuum ducts. These switches consist of a vane housing a small magnetic element placed within the airflow inside the duct, while the sensor is positioned externally. Under normal conditions, the flow of air in the blower sustains the vane in close proximity to the reed sensor. However, if there’s a decline in the airflow due to factors like filter clogging or saturation of exhaust water jackets, the vane fails to trigger the reed switch.

This failure to actuate the reed switch serves as a signal, indicating a decrease in airflow rate. This signal can then be utilized to activate indicators such as a “filter change” LED, prompting maintenance actions, or in critical scenarios, it can trigger alarms to draw immediate attention to the issue.

By employing Reed Switches in blowers in this manner, systems can proactively monitor their operational efficiency and promptly address any deviations from optimal performance, ensuring the continued effectiveness and safety of the environment they operate within.

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

When an application requires the end position of a movement sensed, or the sensing of a part when it comes into a zone, or when the Continue reading -> Sep 29, 2024

Recommended Products

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.

Miniature Flat Pack Reed Sensor MS-324

Drawing of MS-324 Magnet Sensor starFeatures10W Contact Rating. Normally Open contact. Three sensitivity bands. Sputtered Ruthenium Continue reading -> Sep 28, 2024

Reduced Miniature Reed Switch, RM-1318

Full Length LeadsCropped LeadsSMD Formed LeadsLeads Formed for Horizontal mountingLeads Formed for Vertical Continue reading -> Sep 29, 2024

Sub Miniature Reed Switch, SM-1322

Reed Switch with Full Length LeadsCropped LeadsSMD Formed LeadsHorizontal MountingVertical Mounting starFeaturesRelease AT Continue reading -> Sep 28, 2024

Miniature Cylindrical Magnet Sensor, MS-214

Drawing of MS-214 Magnet Sensor starFeatures10W Contact Rating. Normally Open contact. Three sensitivity bands. Sputtered Ruthenium Continue reading -> Sep 28, 2024