The in line type magnetic flow meters offer a higher accuracy. They can be as accurate as 0.5% of the flow rate. The insertion styles offer a 0.5 to 1% accuracy. Example : Omega’s FMG-600 series in line flange and wafer style meters offer higher flow rates of 1 to 10 m/sec. These in line meters are offered in pipe sizes up to 12".
Minimum conductivity: 5 micro Siemens/cm
In line flow meters do not require as much straight pipe as the insertion styles. A minimum of 5 to 10 pipe diameters of straight run upstream and 1 to 2 diameters downstream is recommended.
In vertical pipe runs, flow should always run up and not down. These flowmeters are very sensitive to air bubbles.
The magmeter cannot distinguish entrained air from the process fluid; therefore, air bubbles will cause the magmeter to read high.