KROHNE UFM 500 EN User Manual
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39
Part D Technical data, measuring principle, block diagram
10.
Technical data
10.1
Versions, measuring ranges, accuracies
Versions
Compact systems (K)
UFM 400 K
UFM 500 K
UFM 500 K-EEx
Signal converter (C)
UFC 400
UFC 500
UFC 500-EEx
Local display
no
yes
yes
Primary head (S)
UFS 500
UFS 500
UFS 500
Remote systems (F)
UFM 400 F
UFM 500 F
UFM 500 F-EEx
UFC 400
UFC 500
UFC 500 F-EEx
no
yes
yes
UFS 500 F
UFS 500 F
UFS 500 F-EEx
Measuring ranges
Full-scale range Q
100%
UFM 400: factory setting
UFM 500: user-defined
lowest
highest
Meter size DN in mm
14.2
100
DN
/hr]
[m
Q
2
3
min
100%
×
=
0.05
DN
/hr]
[m
Q
2
3
max
100%
×
=
Meter size (DN) in inches
0.9
DN
/hr]
[m
Q
2
3
min
100%
×
=
3.9
DN
GPM]
[US
Q
2
min
100%
×
=
31.25
DN
/hr]
[m
Q
2
3
max
100%
×
=
138
DN
GPM]
[US
Q
2
max
100%
×
=
Measurement accuracies UFM 400/500
Linearity
for v > 0.5 m/s (> 1.6 ft/s): within ± 0.5%
for v
≤
0.5 m/s (
≤
1.6 ft/s): within ± 2.5 mm/s (0.1 inch/s)
Uncertainty
for size
≥
DN100 (
≥
4”):
within
±
(0.001 x DN [mm]) m
3
/hr
for size < DN100 (<4”):
within
±
(0.0015 x DN [mm]) m
3
/hr
Influence of temperature
Less than
±
0.1% per 10K
Influence of Reynolds number (Re)
•
single beam flowmeters
•
double beam flowmeters
± 1% of measured value for Re > 5000
± 0.1% of measured value for a change of Re =100
within the Re 1000 - 4000 range.
Repeatability
single beam flowmeters
double beam flowmeters
better than 0.3% of measured value
better than 0.2% of measured value