Water Meter WP-Dynamic Flow Sensor For Hot Water up to 130° C DN 40 Flow Sensor Rate Pressure PN 40 Technical Data Performance Data WP-Dynamic 130° C Nominal Diameter : DN 40 Qmax : - Maximum peak flow once lifetime 24h Qmax or 5 min. 1.2 x Qmax Qn-Continuous Flow ( ± 2% ) : 10 m³ / h Qt-Transitional Flow ( ± 2% ) : 1.8 m³ / h Qmin-Minimum Flow ( ± 5% ) : 0.6 m³ / h Starting Flow : 0.25 m³ / h