DP-702LH Differential Air Pressure Sensor Board GrayWolf Sensing Solutions
There’s a trade-off between range and low-end resolution with commercially available ∆P sensors. For many Indoor Air Quality (IAQ), Heating Ventilation Air Conditioning (HVAC), Industrial Hygiene (IH) or other applications, extremely low-end ∆P resolution is critical, yet a wide measurement range is highly desirable. GrayWolf solves this by incorporating a 250.0 Pa (1.000 inches H2O) range sensor and a 10KPa (40.0 inches H2O) sensor on the same board and then smoothly auto-ranging from one sensor to the other dependent on the detected pressures. A further issue for low-end measurements, such as determining pollutant pathways, is that sensor drift at these tiny pressures may be significant over a matter of only minutes. Most low range digital manometers include a manual zeroing button to depress in open air ahead of each reading. But for long-term monitoring, the manometer must re-zero automatically in order for the readings to be reliable over time. The DP-702LH board does exactly this, auto-zeroing both sensors every 2 minutes.
This combination of unequaled low-end sensitivity, and wide-range measurement capability, makes the DP-702LH ideal for applications including:
· Verifying positive pressure in occupied areas during local area construction.
· Monitoring/logging positive pressure vs. negative pressure over time for adjacent zones such as classroom/kitchen, childcare room/parking garage, general office/laboratory (and under varied conditions).
· Investigating pollutant pathways (quantifying ΔP is an essential IAQ investigation tool).
· Testing filter performance (the most reliable way to rate dirt loading on the filter).
· Determining pressure drop across coils, diffusors, registers, fans, orifice plates.
· Measuring static pressure, air velocity and volume airflow with a pitot static tube.
· Measuring air velocity over a broad range with a pitot static tube; 1.0 m/s up to 125 m/s (200 ft/min up to 25,000 ft/min).
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02 December 2011
