Take flow measurement with you.

Portable ultrasonic measurement for site visits, system checks and temporary monitoring.

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At a glance

What P118i does, in plain words.

What it measures: Liquid flow; How much liquid moves through the pipe.
How it installs: Clamp-on; Sensors fit on the outside of the pipe, so the pipe stays closed.
How it connects: On-device storage; Readings are shown on screen and stored on the device.
Pipe sizes: DN15–DN6000; DN is the nominal pipe size, roughly the inside diameter in millimetres.

Why P118i

P118i in short.

P118i (2026 version) is a compact, lightweight portable ultrasonic flowmeter. A rechargeable battery and universal power supply let you measure pipelines anywhere.

Its magnetic clamp-on transducers attach to magnetic metal pipes, which suits on-site checks of toxic or highly corrosive media, overhead lines and pressurised systems.

±0.5% of measured value
Pipes from 15 to 6000 mm
About 10 hours on the rechargeable battery
Logs to a 2 GB SD card
3.5-inch colour screen

Where it is used

Water treatment and distribution
Pharmaceutical
Inland aquaculture
Heating and cooling circuits
Swimming pools and irrigation
Fire-fighting installations
Automotive industry and energy plants

P118i in the hand

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.

How clamp-on ultrasonic measurement works →

Pipe & installation

What the meter needs to know about your pipe.

These are set up on the meter after installation. Pipe size and transducer type are decided when ordering.

Pipe & installation guide pipe materials, sizes, setup checklist

Stainless steel · 2″ example

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 needs Pipe size Wall thickness Material: 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 P118i; values that are still being checked are left out.

Performance (2026 version)

Flow velocity: ±0.01 to ±12 m/s (±0.03 to ±40 ft/s)
Accuracy: ±0.5% of measured value
Repeatability: 0.15%
Linearity: ±0.5%
Pipe size: 15–6000 mm (0.6″–240″)
Medium: Water
Medium temperature: −40 °C to 80 °C (standard)

Function

Output: 4–20 mA, max. 750 Ω
Data storage: SD card, 2 GB; up to 512 files; interval 1–60 s
Power supply: Rechargeable lithium battery, about 10 hours of continuous use
Keypad: Tactile keys
Display: 3.5-inch TFT colour screen, 320 × 240, backlit
Ambient temperature: −10 °C to 50 °C
Humidity: 0–99% RH, non-condensing

Physical

Transmitter: NEMA 13 (IP54)
Transducer: Encapsulated, IP68; cable 5 m
Weight: Transmitter 1 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.