WATER FLOW 1/2 INCH BRASS

SEN-HZ21WI ½-inch brass body Hall effect water flow sensor with 3-pin JST connector. A rotating magnetic wheel generates pulses to calculate flow rate and total volume. Suitable for drinking water (0–80°C). 1 litre = 553 pulses (±10%). Flow formula: F = 10Q − 4 (F: Hz, Q: L/min).

Pin Connection:

• Red — VCC (5–18V)
• Black — GND
• Yellow — Pulse output

Specifications:

• Model: SEN-HZ21WI
• Body: Brass, ½-inch
• Sensor: Hall effect
• Flow Range: 1–30 L/min
• Operating Voltage: 4.5–18V DC (≤15mA)
• Output: Pulse (High ≥4.5V, Low ≤0.5V @ 5V)
• Duty Cycle: 50%
• Pulses per Litre: 553 (±10%)
• Flow Formula: F = 10Q − 4
• Max Hydraulic Pressure: 1.75 MPa
• Insulation Resistance: >100MΩ

Applications:

• Thermostatic water heaters and purifiers
• Water dispensers and coffee machines
• Industrial water flow monitoring