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Airflow Sensor Critical for HVAC Control System

Airflow Sensor Critical for HVAC Control System

Airflow Sensor is Key Element of HVAC Control System                                
HVAC Series "Analyzing Airflow" Part 4:  

A well-run HVAC control system is conducive to a healthy and comfortable indoor environment, helps maintain equipment life expectancy, and helps save costs. The control system is only as good as its sensing devices. Degree Controls airflow sensors are key elements of HVAC control systems.

Care should be taken in choosing the right airflow sensor for your application. Close attention should be paid to both sensor mounting and location to ensure that it will function according to published specifications. Here are some sensor considerations to evaluate:

  • Check the specs against the environment the sensor will be used in. 
  • Consider outside influences such as vibration, spray water or debris. Decide if any special provisions will be needed for protection.     
  • Determine where the sensor will be mounted. Avoid mounting the sensor in turbulent locations caused by elbows or duct size changes, and follow ASHRAE best practices. 
  • Determine the insertion depth needed for the application. The main airflow cavity surrounding the flow thermistor should be in the center of the duct when the sensor is installed.
  • Be mindful of the size of the airflow probe. A probe may impact flow and thus airflow measurements in a small cross-sectional duct. An airflow sensor with remote head or low profile head may be needed.
  • Find out what airflow velocities the sensor is expected to encounter. Choose the sensor velocity range accordingly.
  • Understand the sensor flow direction and whether it is non-directional or bidirectional. The main airflow cavity surrounding the flow thermistor must be orientated perpendicular to airflow being monitored in order for it to function as designed.
  • Mount the sensor securely. Do not overtighten °C-Clamps.
  • Dress the sensor cable. Allow a sufficient cable bend radius and loop to prevent stress and premature wear. The wiring system should allow for serviceability.
  • Maintain sensor signal integrity. Avoid excessive cable length, and keep cabling separate from high voltage lines.

Air Flow Sensors for HVAC Ducts

Airflow Switch for HVAC Duct

S Series Air Flow Sensors for HVAC Ducts

The S-Series is a specialized platform of air velocity and temperature switches optimized for demanding applications including laboratory, HVAC, high-performance electronics, and more. With both relay and open drain outputs available and configurable alarm behaviors, the S-Series is the most customizable, high-performance airflow switch platform on the market.

Non-Directional Airflow Sensor for HVAC Duct

F Series Air Flow Sensors for HVAC Ducts

The F-Series is a platform of non-directional air velocity and temperature sensors optimized for demanding applications including laboratory, HVAC, high-performance electronics, and more. With both digital and analog outputs, which can be used simultaneously, the F-Series transducer sets a new standard in flexible design integration and airflow control.

Multi-Point Airflow Sensing for HVAC Ducts

C Spar Air Flow Sensors for HVAC Ducts

Fully-configurable °C SPAR Sensor Pole Array system for linear air velocity, humidity & temperature measurement. System is custom built to meet user-defined specifications including pole dimensions, calibration ranges, and sensor quantities. Aggregate sensor data with the °C Port Data Collection Instrument.

Consult with a Airflow Sensor Specialist

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Alex Sargent 
Alex joined Degree Controls, Inc. in 2018 bringing with him nearly a decade of experience with sensor technology and instrumentation. As Technical Sales Engineer he handles the sales of embedded sensors and consults some of the world's largest manufacturers on the use of these instruments.