KROHNE IFC 090 Converter EN - Manual (Page 71)

10/2
Error limits at reference conditions 10.3
Display, digital values, pulse output
F
maximum error in % of measured value (not typical values)
v Flow velocity in m/s and ft/s
Reference conditions similar to EN 29 104
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 x DN/2 x DN (DN = meter size)
Primary head properly grounded and centered
Type/Meter size Maximum error in % of measured value (MV) ... Curve
DN mm
DN 2.5 – 6(1)
DN 2.5 – 6(1)
≥
DN 10
≥ DN 10
inch
1 / 10 ” – 1 / 4 ”(1)
DN 2.5 – 6(1)
≥ 3 / 8 ”
≥
DN 10
v
≥
1 m/s /
≥
3 ft/s
≤
± 0.5% of MV
DN 2.5 – 6(1)
≤
± 0.3% of MV
≥
DN 10
v
<
1 m/s /
<
3 ft/s
≤
± (0.4% of MV + 1 mm/s)
≤
± (0.4% of MV + 0.04 inch/s
≤
± (0.2% of MV + 1 mm/s)
≤ ± (0.2% of MV + 0.04 inch/s)
B
D
A
E
Current output same error limits as above, additionally ± 10
µ
A
Reproducibility and
repeatability
0.1% of MV, minimum 1 mm/s / 0.04 inch/s at constant flow
External influences typical values maximum values
Ambient temperature
Pulse output
< 0.003% of MV (2) 0.01 5 % of MV (2)
Current output < 0.01 3 % of MV (2) 0.025% of MV (2)
Power supply < 0.02 3 % of MV 0.05 5 % of MV (2) at 10% variation
Load < 0.01 3 % of MV 0.02 5 % of MV (2) at max. permissible load,
see Sect. 10.4
(1) IFM 6080 K and IFS 6000 F (DN 2.5 – 4 and 1/10 – 1/6”) additional error ± 0,3% of MV
(2) All Krohne signal converters undergo burn-in tests, duration minimum 20 hours at varying ambient temperatures
– 20 to + 60°C/– 4 to + 140°F. The tests are controlled by computers.
}
per 1 K / 1.8°F variation
0 1.6 3.2 6.4 32 36 40 v [ft/s]