The Dwyer Approach to Monitoring Relative Humidity in Stagnant Air
Balancing a HVAC System with Multiple Diffuser Types
The Problem
- Standard air flow hoods do not correct for diffuser type when balancing a system.
- Proportional balancing is extremely difficult when a mixture of diffusers are present, due to the inaccuracy of standard hoods on slot diffusers.
- Below is a sample of diffusers tested on Dwyer’s Precision Air Calibration Station (Figure A) with a standard air flow hood followed by the Dwyer SMART Air Hood™ Balancing Instrument (Series SAH).
Figure A: Precision Air Hood Calibration Station
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Ask the Expert – Impacts from Extended Pneumatic Tubing
Question:
How will the installation of a Magnehelic® Differential Pressure Gage 150 feet away from the pressure source affect accuracy?
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Mystery Solved! Dwyer Solves the Wall Mount- Relative Humidity Error Problem
Wall mount humidity sensors for building automation system (BAS) applications are produced and sold by several different companies and have a 
reputation of poor accuracy despite specifications from suppliers. There is a rational reason why these instruments appear to read outside of their stated accuracy, which in turn causes users to be frustrated with the results.
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