KROHNE ALTOFLUX 2W IFM 4042K EN - Manual (Page 35)

Part C Technical data, Block diagram and Measuring principle Section 5.2
02/2001 ALTOFLUX 2W 35
5.2 Error limits at reference conditions
Display, digital values, pulse output
• calibated in accredited test rigs to EN 17 025 by direct comparison of volume
F maximum error in % of measured values (not typical values)
v Flow velocity in m/s and ft/s
Reference conditions similar to EN 29104
Product water at 10 – 30 °C / 50 – 86 °F
Electrical conductivity >300
µ
S/cm
Power supply (rated voltage) U
N
(±2%)
Ambient temperature 20 - 22 °C / 68 – 71.6 °F
Warm-up time 60 min
Inlet / outlet runs 10 × DN / 2 × DN (DN = meter size)
Primary head properly grounded and centered
Measuring time 100 s
Meter size Maximum error in % of measured value (MV) at ...
DN mm inch v
≥
1 m/s /
≥
3 ft/s: v < 1 m/s / < 3 ft/s:
DN 10 - 150 3 /
8
” – 6“ ≤ ±
0,5% MV
≤ ±
5 mm/s /
≤ ±
0.2 inch/s
Current output Same error limits as above, additionally ± 10
µ
A
Reproducibility at v
≥
1 m/s /
≥
3 ft/s: v < 1 m/s / < 3 ft/s:
constant flow ≤ ±
0,1% MV
≤ ±
1 mm/s /
≤ ±
0.04 inch/s
External influences typical values maximum values
Ambient temperature
Pulse output
0,003 % MV
1)
0,01 % MV
1)
Current output 0,01 % MV
1)
0,025 % MV
1)
}
at 1 K / 1.8 °F variation
Power supply < 0,02 % MV 0,05 % MV at 10 % variation
1) All KROHNE signal converters undergo burn-in tests, duration minimum 20 hours at varying ambient temperature
–20 to + 60 °C / -4 to +140 °F. The tests are controlled by computers.