MSR Magmeter
Up and downstream distance from obstructions
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The overall turbulence and uniformity of flow determines how far away from an obstacle the Magnum can be installed. A good indicator of this is the Reynolds number. The higher the number the less distance required - or in other words the faster the flow and the bigger the pipe the less distance is required.

To calculate the Reynolds number and velocity for your pipe we have a handy shareware called "Pressure Drop" in the software library section.