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The Problem – Pressure Drop Across Protective Mask Face masks are often the first line of defense against the spread of infection or damaging particles. A properly designed face mask will stop dangerous materials, but allow normal air flow for breathing. The mask material must be woven tightly enough to trap unwanted particles, but the pressure drop through the mask should be low enough so that breathing effort is normal. Testing protective masks requires the measurement of pressure drops equal to just a few millimeters of water.
The Solution The Validyne DP103 differential pressure transducer is available in full scale pressure ranges as low as 3.5 mm H2O. This transducer was recently used to measure the pressure drop through prototype face masks that were on the order of 5 to 10 mm H2O. The pressure drop was to be recorded at different flow rates and this required a data acquisition system for the output of the DP103.
Validyne Products The DP103 transducer was combined with the CD280 carrier demodulator so that a +/-10 Vdc output was achieved with a +/-10 mm H2O differential pressure. This analog output was sent to the PCM862 A/D card for a notebook PC. A data acquisition application program was supplied that graphed the pressure drop as a virtual strip chart and recorded the data to a text file suitable for importation into Excel.
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| Phone: 818.886.2057 || Email: Sales@validyne.com |
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