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Wind Tunnel Calibrations

Wind Tunnel Calibrations

Wind tunnel pitot calibration services are available from Apex Instruments.

  • Method 2 and Method 5 pitot calibrations are available on-site and year-round.
  • Method 2F/2G (3D/2D) pitots are calibrated by request.
  • Method 201A (PM2.5 and PM10) pitots are calibrated on a semi-annual schedule.

All pitot wind tunnel calibrations are conducted in accordance with U.S. EPA Methods.



Next wind tunnel pitot calibration date: January 23rd, 2020

  • Method 201A pitots (PM2.5, PM10, and PM2.5+10)
  • Calibration on January 23rd, 2020
  • Pitots must be received by Jan. 20th

Please contact our service department to get a quote on pitots or request an RMA to have your pitots calibrated.

Technical Support Email: support@apexinst.com
Technical Support Number: (877) 726-3919

Method 201A Pitot Calibration

According to EPA Method 201A, Section 8.6.2 and ASTM D3796, the pitot tube used in Method 201A must be calibrated in a wind tunnel while attached to the probe assembly and cyclone: the cyclone is a potential disturbance to the source flow and could change the pitot coefficient value from the baseline value.

Retests due to uncalibrated equipment can cost as much as $200,000 in fuel cost alone!