Sierra INNOVA-FLO 220 User Manual
Page 12
Chapter 1 Introduction
Series 220/221 Instruction Manual
1-6
IM-22
As shown below, Innova-Flo
™
Vortex Flow Meters exhibit a constant
Strouhal number across a large range of Reynolds numbers, indicating a
consistent linear output over a wide range of flows and fluid types. Be-
low this linear range, the intelligent electronics in Innova-Flo automati-
cally corrects for the variation in the Strouhal number. Innova-Flo’s
smart electronics correct for this non-linearity by calculating the Rey-
nolds number based on constant values of the fluid’s density and viscos-
ity stored in the instrument’s memory. Innova-Flo Vortex Flow Meters
automatically correct down to a Reynolds number of 5,000.
0.3
0.2
0.1
0.0
3
4
10
Linear range
Reynolds Number, Re
Strouhal Number, St
10
5
10
10
8
10
6
10
7
5000
Corrected range
Figure 1-3. Reynolds Number Range for the Innova-Flo Meter