Water Meter WP-Dynamic Flow Sensor For Hot Water up to 130° C DN 250 Flow Sensor Rate Pressure PN 40 Technical Data Performance Data WP-Dynamic 130° C Nominal Diameter : DN 250 Qmax : 1000 m³ / h Maximum peak flow once lifetime 24h Qmax or 5 min. 1.2 x Qmax Qn-Continuous Flow ( ± 2% ) : 500 m³ / h Qt-Transitional Flow ( ± 2% ) : 45 m³ / h Qmin-Minimum Flow ( ± 5% ) : 20 m³ / h Starting Flow : 10 m³ / h Performance data table according to PTB-A22 spesification class B Diameter Nominal DN : 250 mm Size of meter ( acc. to PTB-A-22) Qn : 400 Qmax-Maximum peak flow short time : 800 m³ / h Qn-Continuous Flow ( ± 3% ) : 400 m³ / h Qt-Transitional Flow ( ± 3% ) : 60 m³ / h Qmin-Minimum Flow ( ± 3% ) : 16.0 m³ / h