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ULTRAFLOW® 54/34
Kamstrup A/S · Technical description · 5512-2464_A1_GB_08.2019
73
9.4
Optimization in connection with calibration
To make a rational test of ULTRAFLOW®, it must be possible to reproduce the test results. This is also very important if
the tested sensors are to be adjusted.
Experience shows that ULTRAFLOW® operates with standard deviations of 0.3…0.4 % at q
i
and 0.2…0.3 % at q
p
. This is
standard deviations at 300…500 pulses at q
i
, 3000…5000
at q
p
, and flying start/stop.
In connection with the optimization of calibration, the following subcomponents can be considered:
Pressure:
Optimal working pressure is 4…6 bar of static pressure. This minimises the risk of air and cavitation.
Temperature: Calibration temperature according to EN 1434-5 is 50 °C ± 5 °C for heat meters and 15 °C ± 5 °C for cooling
meters.
Note: For further information regarding allowable test conditions such as water temperature and flow of the individual
ULTRAFLOW®, see the approval of ULTRAFLOW® (see paragraph
Water quality: Recommended water quality as described in CEN TR 16911 and AGFW FW510
Installation (mechanical conditions):
To avoid flow disturbances, the inlet pipes and distance pieces must have the same nominal diameter as the sensors (see
). There should be min. 5 x DN between the sensors. In connection with bends, etc., there should be a minimum
distance of 10 x DN. If tests are made at low flow with a bypass at right angles to the pipe, it will be an advantage to
mount an absorber of pressure fluctuations caused by the perpendicular inlet. This can be a flexible tube on the bypass.
In addition, it will be an advantage to mount a flow straightener before the first distance piece. Flow disturbances such
as pulsations, e.g. pump fluctuations must be minimised. In connection with calibration, a code of practice for distance
pieces has been made on the basis of many years' experience:
The lengths of the distance pieces must be 10 x DN.
The diameter of the distance pieces must be:
Connection
Distance piece
G¾B (R½) DN15
ø15
G1B (R¾) DN20
ø20
DN20
ø20
G5/4B (R1) DN25
ø25
DN25
ø25
G1½B (R5/4) DN32
ø32
DN32
ø32
G2B (R1½) DN40
ø40
DN40
ø40
DN50
ø50
DN65
ø65
DN80
ø80
DN100
ø100
DN125
ø125
Table 32. Distance pieces.
At horizontal mounting of ULTRAFLOW® 54/34, which is typical for a flow bench, pay special attention to
Orientation of ULTRAFLOW® 54/34 around the pipe axis at horizontal mounting
. As a starting point, it is recommended to
install threaded meters with the plastic box to the side, which is metrologically correct and ergonomic for the mounting
of a 4-pole connector in ULTRAFLOW® 54/34 (see
). The orientation of flange meters is normally
less flexible and defined by the holes in the flanges and bolts in the flow bench. Here, the plastic box is typically turned
+45° upwards. Note that ULTRAFLOW® must NOT be evacuated (exposed to vacuum). To make it easier to bleed the
meter, you can, in contrary to our general installation recommendations, still install ULTRAFLOW® 54 (type 65-5-XXHX-
XXX) in the flow bench during the test with the electronics (transducers) pointing downwards.