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Conversion Chart – Vacuum vs. Pressure % Vacuum "Hg mmHg bar PSI 10 3 76.92 -0.1 -1.47 20 6 153.85 -0.2 -2.94 30 9 230.77 -0.3 -4.41 40 12 307.69 -0.4 -5.88 50 15 384.62 -0.5 -7.35 60 18 461.54 -0.6 -8.82 70 21 538.46 -0.7 -10.29 80 24 615.38 -0.8 -11.76 90 27 692.31 -0.9 -13.23 100 30 769.23 -1.0 -14.70 Facts to Remember: 50 mmHg = 1 PSI 1mmHg = 1 torr (vacuum) 1"Hg = 25.4 mmHg 2"Hg = 1 PSI 29.92"Hg = 100 Kpa 14.7 PSI = 100 Kpa 14.7 PSI = 29.92"Hg 14.7 PSI = 760 mmHg Air Consumption: The volume of compressed air required to power the generator. Atmospheric Pressure: The atmosphere that surrounds the Earth can be considered a reservoir of low pressure air. Its weight exerts a pressure that varies with temperature, humidity and altitude. Barometer: A device usually filled with mercury that measures atmospheric pressure. Compressed Air Considerations: 1HP @ 80 PSI generates approximately 4 SCFM of flow. Standard or Average Atmospheric Pressure at Sea Level: 29.92"Hg or [760 mmHg] Vacuum Flow: The volume of free air induced by the vacuum generator per unit of time, expressed as standard cubic feet per minute – SCFM or [liters per minute - LPM] Vacuum Force: Equal to the vacuum level X the area of the vacuum surface, i.e. holding area of a vacuum cup. Vacuum Level/Elevation: The magnitude of the suction created by the vacuum generator. The unit of measure is inches of Hg ("Hg) or (mbar). Vacuum level is affected by elevation and barometric pressure. For each 1,000 feet of elevation, vacuum level decreases by 1" of Hg. Venturi's, Ejectors, Transducers, Generators, Eductors: All of these are different names for air powered vacuum generators. Vacuum vs. Elevation: Vacuum Level = The magnitude of suction created by the vacuum generator. Vacuum level is affected by elevation and barometric pressure. For each 1,000 feet of elevation, the vacuum level that the generator can achieve decreases by approximately 1"Hg [33.9mbar]. ISO 9001:2008 Certified • Made in the USA VACUUM TERMS AND DEFINITIONS 10 For more information or for additional configurations, please contact us at NASInsideSales@imi-precision.com