MULTICAL® 302
Kamstrup A/S · Technical Description · 5512-1334_F1_GB_12.2016
25
5
Pressure loss
Pressure loss in a flow sensor is stated as max. pressure loss at q
p
. According to EN 1434 maximum pressure must not
exceed 0.25 bar.
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 [m³/h]
∆
p = pressure loss [bar]
q
p
Nom. diameter
Δp@q
p
[m³/h]
[mm]
[bar]
[m³/h]
A
0.6
G3/4B x 110 mm
DN15
0.02
4.89
2.4
A
1.5
G3/4B x 110 mm
DN15
0.09
4.89
2.4
B
1.5
G1B x 130 mm
DN20
0.07
5.71
2.9
C
2.5
G1B x 130 mm
DN20
0.09
8.15
4.1
Graph
Housing
kv
Table 2: Approximated pressure loss table
0,01
0,1
1
0,1
1
10
Δp
[b
ar
]
Flow [m³/h]
Δ
p MULTICAL
®
302
A
B
C
Diagram 2: Pressure loss graphs
5.1
Calculation of pressure loss
The pressure loss at a given water flow can be calculated as:
Δ
p=(Q/kv)
2
.
Example: a qp 1.5 meter with a current flow of 0.5 m
3
/h:
Δ
p=(0.5/5)
2
= 0.01 bar