Kamstrup ULTRAFLOW 54 DN150-250, Technical Description, Page: 16 / 64

TECHNICAL DESCRIPTION ULTRAFLOW
®
54 DN150-250
5512-876 GB/04-2012/Rev. F1
16
6 Pressure loss
Pressure loss in a flow sensor is stated as max. pressure loss at q
p
.
According to EN 1434 max. 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 meter 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]
Nom. flow q
p
Nom. diameter
Q at 0.25 bar
[m³/h] [mm] [m³/h]
A 150 & 250 DN150 1060 530
B 400 DN150 2000 1000
C 400 & 600 DN200 & DN250 4040 2020
D 1000 DN250 8160 4080
Graph kv
Table 9. Pressure loss table.
∆
∆ ∆
∆ p ULTRAFLOW
®
54 DN150-250
0,01
0,1
1
100 1000 10000
Flow [m³/h]
∆∆∆∆
p
[
b
a
r]
A
B
C
D
Diagram 1. Pressure loss graphs.