AquaProbe FEA100 / FEA200
Electromagnetic flowmeter – insertion-type flow sensors
5 Setting Up
22
OI/FEA100/200–EN Rev. D
5 Setting Up
5.1 Introduction
The basic equation for volume measurement using the flow sensor is:
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.
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
Example
– for a pipe of internal diameter 593 mm (23.35 in.):
F
p
= 0.861 (derived from Fig. 5.1)
F
i
= 1.021
Q
=
A F
i
F
P
V
Where: Q
=
flow rate
F
i
=
insertion factor
F
p
=
profile factor
V
=
velocity
A
=
area
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).
Fig. 5.1 Profile Factor vs Velocity for Pipe Sizes 200 to 2000 mm (8 in to 80 in.)
F
i
1
1
38
D
–
-------------------------------------
=
F
i
1
1
38
593
–
-------------------------------------------
=
Pipe Bore in Inches
Pipe Bore in mm
Pr
ofile Fact
or
(Fp)
8
16
24
32
40
48
56
64
72
80
200
400
600
800
1000
1200
1400
1600
1800
2000
0.875
0.870
0.865
0.860
0.855
0.850