Prove Fan Airflow with the S400 Air Velocity Switch

February 22, 2024 | Posted By: Degree Controls Inc.
Example Trip Point Configuration

Fans are used across a wide variety of machinery in a multitude of industries. Cooling, drying, material transportation, and chemical processing are just a few of the many applications. To keep systems and processes running smoothly, engineers integrate airflow switches into their industrial automation to detect when fans are not moving enough air.

Where fans need to be running for equipment to operate safely,  one manufacturing technology solutions company has added S400 air velocity switches to monitor the fans and confirm that airflow is adequate:

  • Fans are integrated into a shroud above the machinery.
  • Airflow direction is top to bottom.
  • Fan rpm varies. At the minimum fan speed, air velocity is 0.9 m/s (177 fpm).

To fit with the low rpm requirement, the probe-style S400s are configured with a trip point of 0.3 m/s (59 fpm), and to interface with the control system, the client has specified a normally closed (NC) relay output. S400 switches are successfully measuring actual airflow, rather than inferring it from some other measurement, and work reliably at the low rpm level. The S400 triggers an alarm when velocity drops below a predefined threshold.

The S-Series platform of high-performance air velocity and temperature switches are configured to order with selections for supply voltage (S300, S400, S500), probe length, output style, and fitting. The velocity trip point is also defined by the user. For our non-directional airflow switches which sense flow from either direction, the trip point range is 0.15 – 20 m/s (30 – 4,000 fpm). 

Prove that your industrial fans are moving enough air and protect the performance and reliability of systems and machinery with the S-Series platform of airflow switches.

Where fan rotation and a certain level of air movement are important to safety, the S-Series air velocity and temperature switch, configured with an analog output, is a customer favorite to prove fan airflow. Alarm below trip point is default and most common, however switches can be configured to alarm above trip point if needed.

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