KROHNE OPTIFLUX 2000 EN - Manual (Page 34)

6
TECHNICAL DATA
34
OPTIFLUX 2000
www.krohne.com 4/2014 - 4000839504 - HB OPTIFLUX 2000 R04 en
6.3 Legal metrology
6.3.1 OIML R49
The OPTIFLUX 2300 has a certificate of conformity with the international recommendation
OIML R49. The certificate has been issued by NMi (Dutch board of weight and measures).
The OIML R49 recommendation (2006) concerns water meters intended for the metering of cold
potable and hot water. The measuring range of the flowmeter is determined by Q3
(nominal flow rate) and R (ratio).
The OPTIFLUX 2300 meets the requirements for water meters of accuracy class 1 and 2.
• For accuracy class 1, the maximum permissible error for water meters is ±1% for the upper
flow rate zone and ±3% for the lower flow rate zones.
• For accuracy class 2, the maximum permissible error for water meters is ±2% for the upper
flow rate zone and ±5% for the lower flow rate zones.
According to OIML R49, accuracy class 1 designation shall be applied only to flowmeter with
Q3 ≥ 100 m
3 /h.
INFORMATION!
OIML R49 and MID Annex MI-001 is only
only only only available in combination with the IFC 300 signal
converter!
Q1 = Q3 / R
Q2 = Q1 * 1.6
Q3 = Q1 * R
Q4 = Q3 * 1.25
Figure 6-2: ISO flow rates added to figure as comparison towards OIML
X:
X: X: X: Flow rate
Y [%]:
Y [%]: Y [%]: Y [%]: Maximum measuring error
1 ±3% for class 1, ±5% for class 2 devices
2 ±1% for class 1, ±2% for class 2 devices