Flow sensor

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Technical specifications
Flow sensor
FS4220 / FS4221

Dimensions

FS4220

Length:

60 mm (2.36 in)

Sensor diameter:

¾ in NPT x ¾ in NPT

FS4221

Length:

66 mm (2.60 in)

Sensor diameter:

1 in NPT x 1 in NPT

Installation

The installation of the flow sensor should be performed by a certified professional in accordance with local and national building codes.

The flow sensor is designed to be installed only with NPT valves and not PEX valves.

*To ensure proper operation and durability of the product, it should only be in contact with treated and impurity-free water.

Recommended
location

The flow sensor must be placed before the valve on the pipe to do optimal work.

Note: It is important to take into account the arrow on the sensor, which indicates the direction of the water flow and thus, the direction to be used to position the unit properly during installation.

* Depending on your plumbing, additional parts may be required (not included).

Compatibility

The flow sensor can interact with the following devices:

Smart water valve - Wi-Fi
2nd generation
VA4220WF/VA4221WF

Wi-Fi water valve VA4220WF

Smart water valve - Zigbee
2nd generation
VA4220ZB/VA4221ZB

Zigbee water valve VA4220ZB

Compatible platform

Neviweb

Features

• Detects invisible leaks that can occur when pipes break in walls and ceilings
• Sends a closing signal to the main water valve when a leak or abnormal flow is detected **
• Possibility to see your water consumption thanks to the consumption graphs in Neviweb

* The flow sensor detects abnormal flow rates of 2L/min (¾ inch version) and 4L/min (1-inch version).

** Tolerance for abnormal flow before alert or valve closure is at least 15 minutes.

Flow range

FS4220

2-45 L/Min

FS4221

4-45 L/Min

Material

Stainless steel 304, lead-free

Resistance to hydraulic pressure

1.75 MPa (244 PSI)

Water temperature

≤ 60 °C (140 °F)

Certification

Compliant to ANSI B120.1

Compliant to NSF/ANSI 61

In the box

• 1 flow sensor FS4220 or FS4221 
• Installation guide – French version 
• Installation guide – English version

Warranty

3-year limited warranty

Version

Version North American

Documentation

Installation guide FS4220

Product fact sheet