A Reliable and Efficient System for Volumetric Flow Measurements in Ducts and Stacks

The 3DDAS™ data acquisition system and software are tailored to perform duct and stack volumetric flow measurements according to EPA Method 2F. The heart of the 3DDAS™ system is a rugged, industrial computer and a 16 channel, 16-bit data acquisition board. A touch screen and wireless remote transmitter interface simplifies testing procedures.

The 3DDAS™ uses our 3DPROBE™ program to more accurately and efficiently perform 3D duct velocity traverses. The program includes complete test configuration information, data recording and reduction report generation, and error checking. 3DPROBE™ is fully compliant with EPA Methods 2, 2F, 2G, and 2H. Other probe selections include the spherical probe and prism probe (also known as DAT probe).

3DDAS Applications  3ddas

  • Stack/RATA testing
  • Fan outlet ducts
  • Mill inlet ducts
  • General ductwork/piping
  • Turbines/HRSGs
    (with optional water-cooled probe)
  • Fully compliant with
    EPA Method 2, 2F, 2G and 2H


  • Atmospheric pressure transducer
  • Low range pressure transducer set
  • Cold weather operation
  • Heavy duty 3D probe tube bundle
  • Purge pump
  • 3DDAS™ inclinometer
  • Yaw angle laser pointer & protractor
  • Water-cooled probe


  • Industrial NEMA 4/12 rated computer
  • High accuracy (0.25%) pressure transducer
  • Operation range: 40oF to 130oF ambient
  • 30 minute on-board battery backup

For more information, please review the 3DDAS™ system brochure from our partner company, Airflow Sciences Equipment.


From top to bottom: Prism Probe (DAT Probe), S-Probe, and Spherical Probe.