Water Meter WP-Dynamic Flow Sensor For Hot Water up to 130° C DN 50 Flow Sensor Rate Pressure PN 40 Technical Data Performance Data WP-Dynamic 130° C Nominal Diameter : DN 50 Qmax : 30 m³ / h Maximum peak flow once lifetime 24h Qmax or 5 min. 1.2 x Qmax Qn-Continuous Flow ( ± 2% ) : 15 m³ / h Qt-Transitional Flow ( ± 2% ) : 1.8 m³ / h Qmin-Minimum Flow ( ± 5% ) : 0.6 m³ / h Starting Flow : 0.25 m³ / h Performance data table according to PTB-A22 spesification class B Diameter Nominal DN : 50 mm Size of meter ( acc. to PTB-A-22) Qn : 15 Qmax-Maximum peak flow short time : 30 m³ / h Qn-Continuous Flow ( ± 3% ) : 15 m³ / h Qt-Transitional Flow ( ± 3% ) : 2.25 m³ / h Qmin-Minimum Flow ( ± 3% ) : 0.6 m³ / h