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Kamstrup A/S · Technical description · 5512-2464_A1_GB_08.2019
6
Pressure loss
Pressure loss in a flow sensor is stated as maximum 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 a pressure reducing equipment.
The pressure loss increases with the square of the flow and is usually stated as a direct proportionality between the flow
and the square root of the pressure loss:
𝛥𝑝 =
1
𝑘
𝑣
2
𝑞
2
⇔ 𝑞 = 𝑘
𝑣
× √𝛥𝑝
where:
𝑞
= volume flow rate
[𝑞] =
𝑚
3
ℎ
𝑘
𝑣
= volume flow rate at 1 bar pressure loss
[𝑘
𝑣
] =
𝑚
3
ℎ∙√𝑏𝑎𝑟
𝛥𝑝
= pressure loss
[∆𝑝] = 𝑏𝑎𝑟; 1 𝑏𝑎𝑟 = 10
5
𝑃𝑎