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HPAC Engineering, December 2007, Pitot-Tube Technology Helps Maintain...

Hot-wire anemometers succumbed to lint contamination
Airborne particulate not only degrades indoor-air quality, it can affect the performance of HVAC equipment. That was evident at the Rochester Institute of Technology (RIT) in Rochester, N.Y....
...“The hot-wire anemometer performed exactly as it had before, collecting a coating of lint with our equipment, showing a linear degradation as the coating got thicker. After cleaning, the performance would bounce back up and then begin to degrade again. The pitot-tube device didn't degrade at all, and it required no cleaning. It's still performing up to spec and we haven’t had to clean it. Naturally, we don’t use the hot-wire anemometer anymore.”...

The Importance of Correct Airflow Monitoring Stations: A Case Study

How does a healthcare facility that has been occupied only seven months, balanced and recalibrated by the same TAB agency have such severe pressurization problems?
With the high cost of investigative testing and troubleshooting, the vital role of Airflow Monitoring Station cannot be overlooked.
The particular airlow sensing devices for this facility are glass bulb thermal dispersion sensors. During the cleaning of the flow stations for the recalibration purposes, some of the bulbs were found to have a buildup of dirt and lint. This continual buildup was causing incorrect airlow measurements, and in this situation, a vast reduction of outside airlow. Based on all of the information gathered it was assumed that the combination of construction completion, and the introduction of new linens to the facility had caused an unusually high level of airborne particulates. This resulted in a need for flow station cleaning long before expected.