Liquid flow plus supply and return temperatures, to work out heating or cooling energy.
How it installs
Clamp-on
Sensors fit on the outside of the pipe, so the pipe stays closed.
How it connects
PoE / Ethernet
One Ethernet cable carries both power and data.
Works with MeterTube, the pFlow app and cloud platform.
Pipe sizes
DN20–DN80
DN is the nominal pipe size, roughly the inside diameter in millimetres.
Why E3E
E3E in short.
E3E measures water flow and heating or cooling energy from outside the pipe. It uses the transit-time ultrasonic principle with Gentos signal processing and a flow-and-energy algorithm.
Readings are stored in the cloud over its Ethernet connection, so you can view, analyse and query them from a phone or a PC.
Power and data over one Ethernet cable (PoE)
Works with the MeterTube app and platform
Installs without cutting or damaging the pipe
No adjustment needed: plug in and measure
Colour LCD that rotates through 360°
Where it is used
HVAC heating and cooling circuits
Energy-saving monitoring
Heat balance regulation
Heating regulation
Air-handling unit (AHU) rooms
How it works
Sound with the flow arrives sooner.
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 E3E; values that are still being checked are left out.
Performance
Measurement
Water flow and heating / cooling energy
Flow velocity
0.03–5.0 m/s (0.1–16 ft/s)
Flow accuracy
±2% of reading (0.3–5 m/s)
Energy accuracy
Not specified; the catalog states the flow accuracy only
Repeatability
0.2%
Pipe sizes
DN20, DN25, DN32, DN40, DN50, DN65, DN80
Medium
Water
Pipe material
Carbon steel, stainless steel, PVC, copper
Function
Network
Ethernet with Power over Ethernet (PoE)
Power supply
Power over Ethernet (PoE), IEEE 802.3af/at
Keypad
4 touch keys
Local display
1.44-inch colour LCD, 128 × 128
Physical
Installation
External clamp-on configuration
Ambient temperature
−10 °C to 50 °C (14 °F to 122 °F)
Transducer temperature
0 °C to 60 °C (32 °F to 140 °F)
Temperature sensor
0 °C to 100 °C (32 °F to 212 °F)
Ingress protection
IP54
Cables
PoE waterproof cable 0.5 m (1.6 ft); temperature sensor cable 2 m (6.6 ft)
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.
Product photo · stainless steel pipe
Thermal energy
Thermal energy