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
WiFi
Wireless over your WiFi network, with readings stored in the cloud.
Pipe sizes
DN25–DN1200
DN is the nominal pipe size, roughly the inside diameter in millimetres.
Why E5
E5 in short.
The E5 is a high-performance BTU meter for precise cooling and heating energy measurement. It combines accurate flow sensing with synchronised temperature tracking to deliver reliable energy data, helping users optimise thermal efficiency in HVAC and energy-saving projects.
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 E5; values that are still being checked are left out.
Performance
Flow velocity
0.01–5.0 m/s (0.03–16 ft/s)
Pipe size
25–1200 mm (1″–48″)
Accuracy
Flow ±1% of reading (0.5–5 m/s); energy ±2% of reading
Repeatability
0.2%
Pipe material
Carbon steel, stainless steel, copper, PVC
Function
Communication
RS485 with Modbus protocol
Analogue output
4–20 mA, max. load 750 Ω
Pulse output
0–9999 Hz, OCT, adjustable frequency limits
Relay output
Max. 1 Hz, 1 A at 125 VAC or 2 A at 30 VDC
Data storage
TF card, more than 1000 days
Wireless
WiFi
Power supply
10–36 VDC, 1 A max.
Physical
Ambient temperature
−10 °C to 50 °C (14 °F to 122 °F)
Transducer temperature
0 °C to 80 °C (32 °F to 176 °F)
Temperature sensor
0 °C to 100 °C (32 °F to 212 °F)
Ingress protection
Transmitter IP65, transducer IP68
Transducer cable
9 m (29.5 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.
Thermal energy
Thermal energy