TECHNICAL DESCRIPTION MULTICAL
®
401
5512-091 GB/02.2008/Rev. J1
22
5 Pressure loss
The pressure loss in a flow sensor is stated as the max. pressure loss at q
p
. According to EN 1434 the max.
pressure loss must not exceed 0.25 bar, unless the energy meter has a flow controller or functions as pressure
reducing equipment.
The pressure loss in a meter increases by the square of the flow and can be stated as:
pkvQ
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 Q@0.25 bar
Graph
[m³/h] [mm]
kv
[m³/h]
A 0.6 & 1.5 DN15 & DN20 3 1.5
B 3 & 3.5 & 6 DN20 & DN25 13.5 6.8
C 10 & 15 DN40 & DN50 43 21.7
Table 5: Pressure loss table
Diagram 2: Pressure loss graphs
p MULTICAL
®
401
0,01
0,1
1
0,1 1 10 100
Flow [m³/h]
p [bar]
BC
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