ULTRAFLOW® 54/34
Kamstrup A/S · Technical description · 5512-2464_A1_GB_08.2019
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7.3
Inlet prerequisites
ULTRAFLOW® requires neither straight inlet nor straight outlet to meet the Measuring Instruments Directive (MID)
2014/32/EU, OIML R75:2002 and EN 1434:2015. A straight inlet section will only be necessary in case of heavy flow
disturbances before the meter. It is recommended to follow the guidelines based on CEN CR 13582.
Optimal position can be obtained if you take the below installation methods into consideration.
A Recommended flow sensor position.
B Recommended flow sensor position.
C Unacceptable position due to risk of air build-up.
D Acceptable in closed systems.
Unacceptable position in open systems due to risk
of air build-up in the system.
E A flow sensor ought not to be placed immediately
after a valve, with the exception of block valves
(full bore ball valve type), which must be fully
open when not used for blocking.
F A flow sensor ought not to be placed immediately
before (on the inlet side) or immediately after (on
the pressure side) of a pump.
G A flow sensor ought not to be placed immediately
after a double bend in two planes.
Figure 18. General installation recommendations for flow sensors.
For general information on installation, see CEN report
CEN/CR 13582, Heat meter installation. Instructions in selection,
installation and use of heat meters.
7.4
Operating pressure
To prevent cavitation, the static pressure at the flow sensor outlet must be min. 1.5 bar (1.0 bar for ULTRAFLOW® 54 type
65-5-XXHX-XXX) at q
p
and min. 2.5 bar (2.0 bar for ULTRAFLOW® 54 type 65-5-XXHX-XXX) at q
s
. This applies to
temperatures up to approx. 80 °C. ULTRAFLOW® must not be exposed to pressure lower than the ambient pressure
(vacuum). For further information on operating pressure, see paragraph
7.1.1 Guidelines for dimensioning ULTRAFLOW®.