Setting Up; Introduction; Centre Line Method - ABB AquaProbe FEA100 User Manual

AquaProbe FEA100 / FEA200
Electromagnetic flowmeter – insertion-type flow sensors

5 Setting Up

5.1 Introduction

The basic equation for volume measurement using the flow sensor is:
Q = A F F
i
Where: Q = flow rate
F = insertion factor
i
F = profile factor
p
V = velocity
A = area
The profile factor and insertion factor must be determined as detailed in Section 5.2 to 5.3, page 23 as
applicable. The pipe diameter must be accurately determined, see Appendix B, page 31 page for use of
gauge.
Note. Due to software configuration, all calculations are in metric units. Therefore if using an imperial
pipe, the diameter MUST be converted into millimeters (1 in. = 25.4 mm, for example, a 36 in. pipe =
914 mm).

5.2 Centre Line Method

1. Determine the internal diameter D of the pipe, in millimeters, by the most accurate method available.
2. Determine the profile factor Fp from Fig.5.1.
3. Calculate the insertion factor
1
------------------------------------ -
=
F
   D
i –
1 38
Example – for a pipe of internal diameter 593 mm (23.35 in.):
F = 0.861 (derived from Fig. 5.1)
p
1
------------------------------------------ -
=
F
   593
i –
1 38
F = 1.021
i
0.875
8
0.870
0.865
0.860
0.855
0.850
200
Fig. 5.1 Profile Factor vs Velocity for Pipe Sizes 200 to 2000 mm (8 in to 80 in.)
22
V
P
 
 
16 24 32
400 600 800
Pipe Bore in Inches
40 48 56
1000 1200 1400
Pipe Bore in mm
5 Setting Up
64 72 80
1600 1800 2000
OI/FEA100/200–EN Rev. D