Airflow Measurement and Control - Hotwire technology

 

 

Applied Systems, representing Air Monitor Corporation, is pleased to announce the new Electra-Flo flow station.  You can learn more by searching our sub pages, downloading the product specifications or by email an Applied Systems sales engineer today.

  • Accuracy to within 2-3% of actual airflow

  • 0 to 5,000 FPM airflow measurement range

  • Up to 32 measurement points per station or probe array

  • Fully field serviceable sensors

  • Rugged, anodized probe construction

  • Optional LonWorks® communication protocol

  • Dual analog outputs (4-20mA, 0-5VDC or 0-10VDC) for airflow and temperature

  • Individual sensor self-diagnostics High visibility backlit LCD can be mounted up to 100’ from station or probe array

  • Selectable display of individual sensor velocity and temperature

  • Password protected membrane keypad for easy access to all transmitter functions

  • Integral honeycomb cell for stations located in highly disturbed airflow

  • CFD (Computational Fluid Dynamics) and wind tunnel optimized sensor aperture design ensures accurate airflow measurement in angular flow conditions.

How it works

The ELECTRA-flo utilizes thermal dispersion technology to measure airflow. As air moves across the surface of an elevated temperature sensor, heat is transferred from the sensor to the airflow in a mathematically defined relationship between heat transfer rate and airflow velocity.

Each ELECTRA-flo sensing node utilizes a pair of precision matched thermistors. One functions as a reference sensor measuring the ambient air temperature at the sensing node location, and the other thermistor is heated to a preset temperature differential (∆T) above the ambient air temperature. Airflow velocity is determined using the measured ambient air temperature, the known heat transfer characteristics of the heated thermistor, and the power consumed to maintain the ∆T between the two thermistors.

Using a combination of Computational Fluid Dynamics (CFD) modeling and extensive full-scale wind tunnel verification, the aerodynamically optimized cross section of the sensing node aperture prevents error inducing turbulence typical of sharp edged sensing tubes.

The aperture’s injection molded shape has been engineered to minimize the angular flow effects naturally present in any duct. The flared aperture captures a representative sample of the ducted airflow, while the contoured leading edges prevent the creation of vortices. The center cross section of the aperture functions in the same manner as a venturi. It stabilizes and flattens the velocity profile at the point of measurement ensuring the airflow maintains full contact with the sensing thermistors. The flow conditioning characteristic of the aperture compensates for turbulent airflow with pitch and/ or yaw angles up to ±30 degrees and produces an accuracy of ±2% of reading for each ELECTRA-flo sensor.

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Contacting ASO:
Allen Sanders

Daniel Mitchell

Jim Krause

Tom Berger

Tanya Moore

Doug Giese

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