Sensors fit on the outside of the pipe, so the pipe stays closed.
How it connects
LoRaWAN
Long-range wireless, sent through a LoRaWAN gateway.
Pipe sizes
DN20–DN80
DN is the nominal pipe size, roughly the inside diameter in millimetres.
Why F3R
F3R in short.
The F3R uses LoRa communication with the LoRaWAN protocol: low-cost, low-complexity, long-range and low-power. It measures with the ultrasonic transit-time method and Gentos’ flow algorithm. The all-in-one clip-on design installs in four steps, without contacting the liquid or shutting down the flow.
Two sensors on the same side of the pipe take turns sending sound through the water. Sound travelling with the flow arrives slightly sooner than sound travelling against it; the meter turns that time difference into flow, which is why it needs to know your pipe.
A smooth metal surface. Clean the spot, add coupling gel, then clamp the sensor on.
60.3mmacross the outside
2.8mmwall thickness
54.8mmacross the inside
Pipe sizes are names, not measurements: a 2″ pipe is 2.375″ across.
The meter needsPipe sizeWall thicknessMaterial: Stainless steel
Technical details standards, OD / ID, both units
Standard
ASME B36.19 · 2″ Sch 10S
Outside diameter (OD)
2.375″ (60.33 mm)
Wall
0.109″ (2.77 mm)
Inside diameter (ID)
2.157″ (54.79 mm)
Meter parameters
OD · wall · material
This guide shows what a clamp-on meter needs to know about a pipe. It does not mean every model fits every pipe: check the specifications below or ask an engineer.
Specifications
Check the fit before you specify.
The short version is above. These are the specifications published for F3R; values that are still being checked are left out.
Performance
Flow velocity
0.03–5.0 m/s (0.1–16 ft/s)
Pipe sizes
DN20, DN25, DN32, DN40, DN50, DN65, DN80
Accuracy
±2% of reading (0.3–5 m/s)
Repeatability
0.2%
Pipe material
Carbon steel, stainless steel, PVC, copper
Function
Communication
RS485 with Modbus protocol
Wireless
LoRaWAN
Power supply
10–36 VDC, 500 mA max.
Physical
Ambient temperature
−10 °C to 50 °C (14 °F to 122 °F)
Transducer temperature
0 °C to 60 °C (32 °F to 140 °F)
Ingress protection
IP54
Transducer cable
φ5 six-core cable, 2 m (6.6 ft) standard
Need a value that is not listed, or the datasheet for your configuration? Ask an engineer.
What these terms mean
DN
Nominal pipe size, roughly the inside diameter in millimetres (DN50 ≈ 50 mm).
Clamp-on
Sensors strap to the outside of the pipe. No cutting, no shutdown for installation.
PoE
Power over Ethernet: one network cable carries power and data.
LoRaWAN
Long-range, low-power wireless. Readings travel through a gateway to a network server.
Modbus RS485
A wired connection widely used by building and industrial control systems.
4–20 mA
An analogue signal where the current represents the reading.
Fixed flow
Fixed flow