Patent ID: 7111491

Claim:
A portable pressure differential generating system comprising: a portable flow accelerator having a passage therethrough, said passage having a high pressure region with a first cross sectional area and a low pressure region with a second cross sectional area, the first cross sectional area being larger than the second cross sectional area, said accelerator further including: an accelerator low pressure tap in fluid connection with the low pressure region of the flow accelerator, said low pressure tap adapted for fluid connection with a low pressure port of a pressure measuring device; an accelerator high pressure tap in fluid connection with the high pressure region of the flow accelerator; said high pressure tap adapted for fluid connection with a high pressure port of a pressure measuring device; a portable pump in fluid connection with the passage in the flow accelerator; and a valve disposed between and in fluid communication with the flow accelerator and the pump, the valve having an upstream side and a downstream side defined by the direction of fluid flow through the valve; a valve low pressure tap in fluid connection with the downstream side of the valve; and a valve high pressure tap in fluid connection with the upstream side of the valve; a range selection device for selecting either a first pressure differential across the accelerator low pressure tap and the accelerator high pressure tap or a second pressure differential across the valve through the valve low pressure tap and the valve high pressure tap.