ABB WaterMaster - Introduction; 2.1 Quality Control

6
WATERMASTER ELECTROMAGNETIC FLOWMETER | DS/WM-EN REV. Y
—
Specification
WaterMaster specification to OIML R49 Class 1
0.1 (0.44) 1.0 (4.4) 10 (44) 100 (440)
1000 (4402)
Error (%)
Flowrate m
3
/h (GPM)
Typical meter
performance
±0.2 % ±0.9 mm/s
whichever is the greater
Around Q2 the
performance is
±0.7 mm/s
WaterMaster Class 1
specification
OIML R49 Class 1
accuracy limits
DN100 (4 in. NB)
WaterMaster specification to OIML R49 Class 2
0.1 (0.44) 1.0 (4.4) 10 (44) 100 (440) 1000 (4402)
Error (%)
Typical meter
performance
±0.4 % ±0.9 mm/s
whichever is the greater
Around Q2 the
performance is
±0.7 mm/s
WaterMaster Class 2
specification
OIML R49 Class 2
accuracy limits
DN100 (4 in. NB)
Flowrate m
3
/h (GPM)
Although OIML R49 does not define the flow accuracy below Q1, WaterMaster continues to measure flow at lower flow rates
down to a cutoff velocity of ±5 mm/s (±0.2 in./s). The accuracy between cutoff and Q1 is typically ±0.9 mm/s (±0.04. in./s).