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Insertion-Type Electromagnetic Probe Flowmeter
AquaProbe 2
4 Setting Up
4.1 Introduction
The basic equation for volume measurement using AquaProbe is:
Q =
A F
Where:
Q =
flow rate,
F
=
insertion factor
i
F
=
profile factor
p
V
=
velocity
A
=
area
The pipe diameter, profile factor and insertion factor must be determined as detailed in see section 5.2,
page 32 to 5.3, as applicable.
Note. Due to software configuration, all calculations are in metric units. Therefore if using an imperial
pipe, the diameter MUST be converted into millimetres (1in = 25.4mm) i.e. a 36in pipe = 914mm
4.2 Centre Line Method
1. Determine the internal diameter D of the pipe, in millimetres, by the most accurate method available.
2. Determine the profile factor Fp from Fig. 4.1.
3. Calculate the insertion factor
1
F
=
i
1 – (38/πD)
Example – for a pipe of internal diameter 593mm (23.35in):
F
= 0.861 (derived from Fig. 4.1)
p
1
F
=
i
1 – (38/593π)
F
= 1.021
i
8
0.875
0.870
0.865
0.860
0.855
0.850
200
Fig. 4.1 Profile Factor vs Velocity for Pipe Sizes 200 to 2000mm (8in to 80in)
30
F
V
i
P
16
24
32
400
600
800
Pipe Bore in inches
40
48
56
1400
1000
1200
Pipe Bore in mm
4 Setting Up
64
72
80
1600
1800
2000
IM/AP
Issue 9
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