Optimization In Connection With Calibration - Kamstrup ULTRAFLOW 54 Technical Description

TECHNICAL DESCRIPTION

9.9 Optimization in connection with calibration

To make a rational test of ULTRAFLOW
the sensors tested are to be adjusted.
Experience shows that ULTRAFLOW
This is standard deviations at 300...500 pulses at q
In connection with optimization of calibration the following aspects should be taken into account:
Pressure: Optimal working pressure is 4...6 bar of static pressure. This minimizes the risk of air and cavitation.
Temperature: Calibration temperature according to DS/EN 1434-5 is 50 °C ± 5 °C for heat meters and 15 °C ± 5 °C
for cooling meters.
Water quality: No requirements.
Installation - mechanical conditions:
To avoid flow disturbances inlet pipes and distance pieces must have the same nominal diameter as the sensors
(see Table 27). There should be minimum 5 x DN between the sensors. With bends etc. there should be a
minimum distance of 10 x DN. If tests are made at low flow through a bypass at right angles to the pipe, it would
be an advantage to mount an absorber of pressure fluctuations due to the angle of the inlet pipe. This can be a
flexible tube on the bypass. In addition, it would be advantageous to fit a flow straightener before the first
distance piece. Flow disturbances such as pulsations, e.g. pump fluctuations must be minimized. In connection
with calibration, a code of practice concerning distance pieces has been made on the basis of years of experience:
The length of the distance piece must be 10 x DN.
The diameter of the distance piece must be:
Installation - electrical conditions:
To avoid external disturbances and to achieve an electrical interface as that of MULTICAL
you use a PULSE TESTER. See paragraph 9.10.
®
it must be possible to reproduce test results. This is also very important if
®
operates with standard deviations of 0.3...0.4 % at q
, 3000...5000 at q
i
Connection Distance piece
G¾ (R½) DN15
G1 (R¾) DN20
DN20
G5/4 (R1) DN25
DN25
G1½ (R5/4) DN32
G2 (R1½) DN40
DN40
DN50
DN65
DN80
DN100
DN125
Table 27. Distance pieces.
5512-385 GB/02.2014/Rev. H1
, and flying start/stop.
p
Gland
ø15 ø14
ø20 ø19,5
ø20
ø25 ø25,5
ø25
ø32 ø32
ø40 ø39
ø40
ø50
ø65
ø80
ø100
ø125
®
ULTRAFLOW 54 and 34
and 0.2...0.3 % at q
i
®
, we recommend that
.
p
53