F
L
O
M
A
G
3
0
0
0
-
In
st
al
la
tio
n
a
nd
O
p
er
at
io
n
M
an
ua
l
6
Converter is capable to detect
flow rates as low as 0.1 m/s.
Upper limit is determined by
capability of liquid to maintain
continuous flow at higher veloci-
ties. This is usually true for flow
rates up to 12 m/s.
Measurement error rapidly
increases for too low flow rates,
as can be seen in the diagram.
It shows limits of maximum rela-
tive measurement error as func-
tion of liquid flow rate.
On the other side, too high
flow rate causes discontinuity of
flow and results in chaotic tur-
bulence and vacuum traps. This
results in instable measurement
and too high drift of flow rate
values.
Ideal operational range of the
sensor is in range from 0.5 to 5
m/s. This range is highlighted in
the diagram for correct size se-
lection.
Flow rate ranges for individual
sizes are chosen to meet EN
14154 standard and they are
shown in table. Preferred
ranges are highlighted in bold.
For non-specified working me-
ters, other range can be also
specified on request.
If range is not specified in a
purchase order, the sensor will
be calibrated in preferred range
in accordance with the table
above.
Correct sensor size selection
10
1
0.1
F
lo
w
v
el
oc
ity
[
m
/s
]
Volume flow rate
10
2
3
4 5
10
2
3
4 5
10
2
3
4 5
10
2
3
4 5
10
2
3
4 5
10
-2
-1
0
2
3
DN
1
0
DN
2
0
DN
2
5
DN
3
2
DN
4
0
DN
5
0
DN
6
5
DN
8
0
DN
1
00
DN
1
25
DN
1
50
DN
1
5
DN
2
00
DN
2
50
DN
3
00
DN
3
50
DN
4
00
DN
5
00
DN
6
00
DN
7
00
DN
8
00
DN
9
00
DN
1
00
0
DN
1
20
0
2
3
4 5
10
10
2
3
4 5
10
2
3
4 5
10
2
3
4 5
10
2
3
4 5
10
2
3
4 5
10
-1
3
4
2
3
4 5
[ l/s ]
[ m /h ]
3
2
Tab. Sensor ranges in m
3
/h according to their sizes
Fig. Limit of maximum relative error of measurement
Diagram for correct sensor size selection.
DN
S10
A25
B25
C25
C50
D25
D50
D100
Range Q3/Q1
R10
R25
R25
R25
R50
R25
R50
R100
10
1
0.63
1
1.6
1.6
2.5
2.5
2.5
15
2.5
1.6
2.5
4
4
6.3
6.3
6.3
20
4
2.5
4
6.3
6.3
10
10
10
25
6.3
4
6.3
10
10
16
16
16
32
10
6.3
10
16
16
25
25
25
40
16
10
16
25
25
40
40
40
50
25
16
25
40
40
63
63
63
65
40
25
40
63
63
100
100
100
80
63
40
63
100
100
160
160
160
100
100
63
100
160
160
250
250
250
125
160
100
160
250
250
400
400
400
150
250
160
250
400
400
630
630
630
200
400
250
400
630
630
1000
1000
1000
250
630
400
630
1000
1000
1600
1600
1600
300
1000
630
1000
1600
1600
2500
2500
2500
350
1000
630
1000
1600
1600
2500
2500
2500
400
1600
1000
1600
2500
2500
4000
4000
4000
450
1600
1000
1600
2500
2500
4000
4000
4000
500
2500
1600
2500
4000
4000
6300
6300
6300
600
2500
4000
6300
6300
10000
10000
10000
700
2500
4000
6300
6300
10000
10000
10000
800
4000
6300
10000
10000
900
4000
6300
10000
10000
1000
6300
10000
1200
6300
10000
Range marking
0.25 0.5
0.5
1
1.5
2
2.5
3
0.75 1
±F
10
11
12
[ % ]
v [ m/s ]
9
DN400..1200
DN10..25, 250..350
DN32..200