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Table 1 - Flowmeter Selection Guide

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Flowmeter
element		 Recommended
Service		 Rangeability Pressure Loss Typical
Accuracy,
percent		 Required
Upstream
pipe,
diameters		 Viscosity
effect		 Relative
Cost
Orifice Clean, dirty
liquids; some
slurries		 4 to 1 Medium ±2 to ±4
of full
scale		 10 to 30 High Low
Wedge Slurries and
Viscous liquids		 3 to 1 Low to
medium		 ±0.5 to ±2
of full scale		 10 to 30 Low High
Venturi tube Clean, dirty
and viscous
liquids; some
slurries		 4 to 1 Low ±1 of full
scale		 5 to 20 High Medium
Flow nozzle Clean and
dirty liquids		 4 to 1 Medium ±1 to ±2
of full scale		 10 to 30 High Medium
Pitot tube Clean liquids 3 to 1 Very low ±3 to ±5
of full scale		 20 to 30 Low Low
Elbow meter Clean, dirty
liquids; some
slurries		 3 to 1 Very low ±5 to ±10
of full scale		 30 Low Low
Target meter Clean, dirty
viscous
liquids; some
slurries		 10 to 1 Medium ±1 to ±5
of full scale		 10 to 30 Medium Medium
Variable area Clean, dirty
viscous liquids		 10 to 1 Medium ±1 to ±10
of full scale		 None Medium Low
Positive
Displacement		 Clean, viscous
liquids		 10 to 1 High ±0.5 of
rate		 None High Medium
Turbine Clean, viscous
liquids		 20 to 1 High ±0.25 of
rate		 5 to 10 High High
Vortex CLean, dirty
liquids		 10 to 1 Medium ±1 of rate 10 to 20 Medium High
Electromagnetic Clean, dirty
viscous con-
ductive liquids
and slurries		 40 to 1 None ±0.5 of
rate		 5 None High
Ultrasonic
(Doppler)		 Dirty, viscous
liquids and
slurries		 10 to 1 None ±5 of full
scale		 5 to 30 None High
Ultrasonic
(Time-of-travel)		 Clean, viscous
liquids		 20 to 1 None ±1 to ±5
of full scale		 5 to 30 None High
Mass
(Coriolis)		 Clean, dirty
viscous
liquids; some
slurries		 10 to 1 Low ±0.4 of
rate		 None None High
Mass
(Thermal)		 Clean, dirty
viscous
liquids; some
slurries		 10 to 1 Low ±1 of full
scale		 None None High
Weir
(V-notch)		 Clean, dirty
liquids		 100 to 1 Very low ±2 to ±5
of full scale		 None Very Low Medium
Flume
(Parshall)		 Clean, dirty
liquids		 50 to 1 Very low ±2 to ±5
of full scale		 None Very low Medium

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