TECHNICAL DESCRIPTION
ULTRAFLOW
®
54 and 34
5512-385 GB/02.2014/Rev. H1
21
6
Pressure loss
The pressure loss in a flow sensor is stated as the maximum pressure loss at q
p
. According to EN 1434 the
maximum pressure loss must not exceed 0.25 bar, unless the energy meter includes a flow controller or functions
as pressure reducing equipment.
The pressure loss in a sensor increases with the square of the flow and can be stated as:
p
kv
Q
∆
×
=
where:
Q =volume flow rate [m³/h]
kv=volume flow rate at 1 bar pressure loss
∆
p=pressure loss [bar]
q
p
Nom. diameter
[m³/h]
[mm]
[m³/h]
A
0.6 & 1.5
DN15 & DN20
3.2
1.6
B
2.5 & 3.5 & 6
DN20, DN25 & DN32
13.4
6.7
C
10 & 15
DN40 & DN50
40
20
D
25
DN65
102
51
E
40
DN80
179
90
F
60 & 100
DN100 & DN125
373
187
Graph
kv
Table 15. Pressure loss table.
Diagram 1. Pressure loss chart for ULTRAFLOW
®
54 and 34.
0,01
0,1
1
0,1
1
10
100
1000
∆
p
[
b
a
r]
Flow [m³/h]
∆
p ULTRAFLOW
®
54 and 34
A
B
C
D
E
F
