An ultrasonic energy meter that measures heating and cooling energy separately, in both directions, on pipes from DN25 to DN1200. It suits the chilled-water and cooling-water circuits of central air conditioning.
Liquid flow plus supply and return temperatures, to work out heating or cooling energy.
How it installs
Clamp-on or insertion
Clamp-on sensors fit outside the pipe. Insertion versions go through the pipe wall.
How it connects
PoE / Ethernet
One Ethernet cable carries both power and data.
Works with MeterTube, the pFlow app and cloud platform.
Pipe sizes
DN25–DN1200 (clamp-on)
DN is the nominal pipe size, roughly the inside diameter in millimetres.
Why E5E
E5E in short.
E5E measures heating and cooling energy separately, in both directions, with a modular design, menu operation and a backlit LCD.
It works with clamp-on or insertion flow sensors and PT1000 temperature sensors. Power and network data share one PoE cable, so readings can be followed in real time on a phone or a PC.
Heating and cooling measured separately, in both directions
Flow accuracy ±1%, energy ±2%
Clamp-on or insertion sensors; DN25–DN1200 clamp-on
Energy-efficiency monitoring with real-time curves
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 E5E; values that are still being checked are left out.
Performance
Measurement
Heating and cooling energy, both directions
Flow velocity
0.01–5.0 m/s (0.03–16 ft/s)
Accuracy
Flow ±1%, energy ±2% (0.5–5 m/s, standard conditions)
Repeatability
0.4%
Pipe size, clamp-on
DN25–DN1200 (1″–48″)
Medium
Water
Pipe material
Carbon steel, stainless steel, PVC
Function
Temperature inputs
2 × PT1000, three-wire, 0–100 °C (32–212 °F)
Power supply
Power over Ethernet (PoE) network cable
Keypad
16 keys (4 × 4)
Display
20 × 2 character backlit LCD
Ambient temperature
−10 °C to 50 °C
Transducer temperature
0 °C to 80 °C
Humidity
0–99% RH, non-condensing
Physical
Transmitter
PC / ABS, IP65
Flow sensor
Encapsulated, IP68
Cables
Flow sensor 9 m (30 ft); temperature sensor 9 m (30 ft)
Weight
Transmitter 0.6 kg; flow sensor 0.75 kg; temperature sensor 0.45 kg
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