AQUA M A STE R4
|
EL EC T R O M AG N E T I C FLO W M E T ER I N SER T I O N SEN S O R | O I/FE W4 0 0/A P - EN R E V. B
13
Setting up
The basic equation for volume measurement using the
insertion sensor is:
Q
=
A F
i
F
ρ
V
Where: Q
=
flow rate
Fi
=
insertion factor
Fp
=
profile factor
V = velocity
A = area
The profile factor and insertion factor must be determined as
detailed below (as applicable). The pipe diameter must be
accurately determined, see page 14 for use of gauge.
IMPORTANT (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).
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 F
ρ
from Figure 14.
3
Calculate the insertion factor
F
i
=
1
1 – (38/(
π
D))
Example:
for a pipe of internal diameter 593 mm (23.35 in):
F
ρ
= 0.861 (derived from Figure 14)
F
i
=
1
1 – (38/(
π
593))
F
i
= 1.021
Pipe bore in mm
Pipe bore in inches
P
ro
fi
le f
ac
to
r (
F
p
)
200
400
600
800
1000
1200 1400
1600
1800
2000
8
0.875
16
24
32
40
48
56
64
72
80
0.870
0.865
0.860
0.855
0.850
Figure 14 Profile factor vs velocity for pipe
sizes 200 to 2000 mm (8 to 80 in)
Mean axial velocity method (1/8 Diameter)
1
Determine the internal diameter D of the pipe, in millimeters,
by the most accurate method available.
2
A profile factor F
ρ
of 1 must be used.
3
Calculate the insertion factor
Example
– for a pipe of internal diameter 593 mm (23.35 in):
F
ρ
= 1
F i
1
12.09
593
1.3042
593
+
+
=
Fi = 1.074
Partial velocity traverse
Refer to page 28 for the procedure.
Transmitter setup
The transmitter can be set up to display point velocity, mean
velocity or flow rate, as required. For full programming details
refer to Instruction manual: OI/FET400-EN.
Menu entries must be made for:
• Profile Factor F
ρ
• Insertion Factor F
c
• Insertion sensor pipe bore (mm)
F i
1
12.09
D
1.3042
D
+
+
=
