Flowmeter Selection: variable_area
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 | 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) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| variable_area | variable_area_rotameter | percent_of_full_scale | 2 | low | 1 | Liquids and gases - clean transparent or opaque service | liquid|gas | Float must be matched to fluid; gravity-dependent must be vertical; no viscous fluids greater than 10 cP without recalibration | Vertical installation (upflow); no straight run required; glass or metal tube | Float position in tapered tube (gravity-dependent) | yes | Simplest meter; no power required for direct-reading; ASME PTC 19.5; widely used in chemical labs | low | 0.05 to 0.2 bar across float | 10:1 | 10 | no | 150 | -200 | Chemical dosing, laboratory, gas purging, pneumatic supply, low-flow sampling | 6 | 0.1 |
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