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ISO 14644 is a standard that provides guidelines for the classification of airborne particulate cleanliness in cleanrooms and controlled environments. It does not specifically outline procedures for air velocity testing using a pitot tube. However, I can provide you with a general explanation of how to conduct an air velocity test using a pitot tube.
Here’s a step-by-step procedure for conducting an air velocity test with a pitot tube:Here’s a step-by-step procedure for conducting an air velocity test with a pitot tube:

Equipment Preparation:

  • Ensure you have a calibrated pitot tube, which consists of a small tube connected to a pressure gauge.
  • Verify that the pitot tube is clean and free from any obstructions or damage.
  • Calibrate the pressure gauge according to the manufacturer’s instructions.

Test Setup:

  • Position the pitot tube in the airflow that you want to measure. The pitot tube should be aligned with the airflow direction and perpendicular to the airflow.
  • Make sure there are no obstructions or disturbances near the pitot tube that could affect the airflow.


  • Turn on the pressure gauge and allow it to stabilize.
  • Position the pitot tube in the airflow, ensuring that it is fully exposed to the airflow.
  • Hold the pitot tube steady for a sufficient period to take accurate readings.
  • Record the pressure reading from the gauge.


  • Use the recorded pressure reading to calculate the air velocity using the appropriate formula or conversion table provided with the pitot tube.
  • If necessary, convert the air velocity from the pitot tube measurement to the desired unit of measurement specified in ISO 14644.

Repeat and Average:

  • Repeat the measurements at multiple locations within the cleanroom or controlled environment to ensure representative sampling.
  • Take multiple measurements at each location and calculate the average air velocity to obtain a more reliable result.


  • Record all the measurement data, including the location, time, and corresponding air velocities.
  • Include information about the pitot tube used and its calibration details.
  • Document any observations or anomalies that may have affected the measurements.

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