Flowmeter Selection: electromagnetic
Flowmeter selection guide covering 16 meter types across 6 categories (differential_pressure, velocity, mass_flow, electromagnetic, positive_displacement, variable_area, open_channel) — each record documents accuracy (% reading or full-scale), rangeability, pressure drop class, fluid compatibility, installation straight-run requirements, and relative cost class
| meter category | meter type | accuracy basis | accuracy pct reading (%) | cost class | cost relative | downstream diameters max | downstream diameters min (pipe_diameters) | fluid compatibility | fluid phase | fluid restrictions | installation notes | measurement principle | moving parts | notes | pressure drop class | pressure drop notes | rangeability | rangeability num | requires power | temp limit C max (degC) | temp limit C min (degC) | typical applications | typical pipe size in max (in) | typical pipe size in min (in) | upstream diameters max (pipe_diameters) | upstream diameters min (pipe_diameters) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| electromagnetic | electromagnetic_magmeter | percent_of_reading | 0.5 | high | 4 | 5 | 2 | Conductive liquids, slurries, corrosive acids or bases - conductivity greater than 5 uS/cm | liquid | Cannot measure non-conductive fluids such as hydrocarbons, DI water, or gases | Full-bore flanged; electrodes must be wetted; horizontal preferred to avoid air pockets; bi-directional | Faraday induction voltage proportional to velocity in conductive fluid | no | OIML R 49; no moving parts; liner materials: PTFE or rubber or ceramic; electrode materials: SS or Hastelloy or platinum | none | Zero permanent pressure loss - full-bore no obstruction | 40:1 | 40 | yes | 180 | -20 | Wastewater, slurries, acids, food or beverage, pharmaceutical, water distribution | 120 | 0.1 | 10 | 5 |
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