This installment of “Truth In Specsmanship” will examine the insertion magmeter technology as it relates to turndown. Turndown is the operating range of a given meter, based on the maximum operating velocity, divided by the turndown factor. For example, suppose a meter has a maximum operating range of 30 ft/s and a turndown of 100:1. […]
Month: February 2013
Truth in Specsmanship, Part 1
Most of today’s flow technologies (paddle wheel, turbines, orifice plates, variable area, pitot tube, vortex, and magnetic) are volumetric, meaning that these devices measure velocity and then calculate volume by using a known cross section area (Velocity (feet/second) x Area (Ft2) = Volumetric flow rate (ft3/s)). In all cases, the higher the velocity the easier […]
Mechanical Flow Meters vs Magnetic Flow Meters
Magnetic flow meters are increasingly taking the place of traditional mechanical flow meter designs. While they both measure the flow of a liquid in a pipe, they do so in different ways. The most common mechanical flow meters are inserted into a pipe and use a turbine, wheel or paddle to measure velocity and then […]