Specification: Water quality requirement: Drinking water health standards, 0～80℃ Flow range: 0.35 ～ 3.0 Liter/min Withstand hydraulic pressure: ≤1.75 MPa Voltage/electric current: DC 4.5 ～ 18 Volt, ≤15mA Insulation resistance: >100MΩ Electrical strength: AC500V, 50HZ Output level: Rated voltage DC5V, high level ≥4.5 Volt, low level ≤0.5 Volt Pulse duty cycle: 50% Flow characteristic: F=73Q, F:HZ, Q:L/min，±10% Cumulative flow conversion: 1 Liter water=1780 pulse, accuracy: 8%