Refrigeration & Air Conditioning Mechanic Red Seal · Question
When performing a duct traverse for airflow measurement using a pitot static tube, which of the following is a critical precaution to ensure accurate readings, as per CSA B52 principles if adapted for airflow measurement accuracy?
For accurate static and total pressure readings, the pitot tube must be aligned precisely with the airflow direction. Not having enough straight run upstream (s
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Question: When performing a duct traverse for airflow measurement using a pitot static tube, which of the following is a critical precaution to ensure accurate readings, as per CSA B52 principles if adapted for airflow measurement accuracy?
Answer options: ✅ Ensure the pitot tube tip faces directly into the airflow.
- Take all readings at the exact centre of the duct for simplicity.
- Maintain a minimum of one duct diameter straight run upstream of the measurement point.
- Fluctuate the fan speed during measurement to get an average.
Correct answer: Ensure the pitot tube tip faces directly into the airflow.
Explanation: For accurate static and total pressure readings, the pitot tube must be aligned precisely with the airflow direction. Not having enough straight run upstream (should be 7-10 diameters) and fluctuating fan speed would lead to highly inaccurate readings. Taking readings only at the centre neglects velocity profile variations.
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