Access Sensor Technologies UPAS User Guide 61
Does altitude affect my UPAS?
Your UPAS has fully altitude/density-corrected volumetric flow control between
2,500 ft (~760 m) below sea level and 20,000 ft (~6,100 m) above sea level
without problems.
Can I use Filter Membranes with different ratings?
Access Sensor Technologies has tested the filter membranes listed in Table 1,
“Recommended UPAS Filter Membranes” on page 6. Use of other filter
membranes can restrict air flow, shorten battery life, and not collect the
necessary particulates.
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