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Technical specifications of your flow sensor


Read the water flow rate

Detects invisible leaks* that can occur when pipes break in walls and ceilings.

Automatic closure

Sends a closure signal to the main water valve when a leak or abnormal flow is detected.

*The flow sensor detects abnormal flow rates of 2L/min (3/4 inch version) 4L/min (1 inch version)

Action on unusual flow

Choose to close the main water valve immediately or be alerted when an abnormal flow ** is sensed.


Duration of abnormal flow before alert

Select the duration of abnormal flow tolerated before the alert is triggered. (e.g.: filling a swimming pool, watering the lawn)

** If no action is taken after receiving such an alert, the valve will close to prevent potential damage

Energy consumption graphs

View your water consumption in real-time thanks to the consumption graphs in Neviweb.


Compatible with 2nd generation Sedna valves VA4220WF / VA4221WF and VA4220ZB / VA4221ZB

Resistance to hydraulic pressure

1.75 MPa (244 PSI)

Water temperature

Operating: ≤ 60°C (140°F)

3-year warranty

Flow range

FS4220 : 2-45 L/Min

FS4221 : 4-45 L/Min


Stainless steel 304, lead-free


Compliant to ANSI B120.1



Length: 60 mm (2.36 in)

Sensor diameter: ¾ in NPT x ¾ in NPT


Length: 66 mm (2.60 in)

Sensor diameter: 1 in NPT x 1 in NPT

Problem solved !