magnetic flowmeter sizing

1. when sizing a magnetic flow meter, in cases where the results are more than one option (meter size), what would be the deciding factor, is it accuracy or something else? results were 0.5,1,1.5 and 2 inch size magmeters

2. when to use a DC powered magmeter and AC powered magmeter? 

  • 1. There could be a couple deciding factors - magmeter size will commonly be selected to match the process piping size to avoid making piping changes; select a size that provides a good velocity range for the application's flow range - it's good practice to try to keep the minimum flow rate above 2 ft/sec velocity to maintain the best accuracy, velocities are usually kept below 20 ft/sec to minimize wear on piping and other devices, for abrasive applications such as slurries the upper velocity should be limited to under 10-15 ft/sec depending on the severity of the abrasive factors of the slurry.
    2. This is dependent on the available power, it doesn't make a difference in the operation or performance of the magmeter.
  • Please refer to attached file, sizing and AC/DC choice are covered