Water Meter WP-Dynamic Flow Sensor For Hot Water up to 130° C DN 80 Flow Sensor Rate Pressure PN 40 Technical Data Performance Data WP-Dynamic 130° C Nominal Diameter : DN 80 Qmax : 90 m³ / h Maximum peak flow once lifetime 24h Qmax or 5 min. 1.2 x Qmax Qn-Continuous Flow ( ± 2% ) : 45 m³ / h Qt-Transitional Flow ( ± 2% ) : 3.2 m³ / h Qmin-Minimum Flow ( ± 5% ) : 1.4 m³ / h Starting Flow : 0.35 m³ / h Performance data table according to PTB-A22 spesification class B Diameter Nominal DN : 80 mm Size of meter ( acc. to PTB-A-22) Qn : 40 Qmax-Maximum peak flow short time : 80 m³ / h Qn-Continuous Flow ( ± 3% ) : 40 m³ / h Qt-Transitional Flow ( ± 3% ) : 6.0 m³ / h Qmin-Minimum Flow ( ± 3% ) : 1.6 m³ / h