04 — Flow Meter

Ultrasonic
Flow Meter

Name: Ultrasonic Flow Meter AUFM-100
Brand: Arrowmech
Availability: InStock

ModelAUFM-100

Clamp-on measurement. No pipe cutting, no shutdown.

Transit-time ultrasonic measurement with clamp-on sensors — install on the outside of the pipe with no cutting, no process interruption, and no pressure drop. Three sensor sizes cover DN25 to DN2000; base price includes one sensor of your choice.

Request a Quote Download Datasheet

Size Range

DN25 – DN2000

Principle

Transit time

Installation

Clamp-on · no pipe cutting

Outputs

4–20mA · RS485
Pulse

FIG. 01 / AUFM-100

A-01 · v3.2

FIG. 01 / AUFM-100 · Clamp-on, wall-mounted transmitterSCALE 1:1.2

Product photography

FIG. 02 / AUFM-100 — WALL-MOUNTED UNIT

FIG. 03 / AUFM-100 — FIELD INSTALLATION

FIG. 04 / APUFM-100 — PORTABLE HANDHELD

FIG. 05 / APUFM-100 — CLAMP-ON SENSORS

No pipe cutting

Sensors clamp to the pipe exterior; install on a live line without shutdown.

Huge size range

Three sensor sizes cover DN25 to DN2000.

Reusable sensors

Each sensor pair works across its full pipe-size range.

Portable option

Battery-powered portable version for surveys and temporary measurement.

How it works

Measure from the outside.

Two sensors clamp to the outside of the pipe — one upstream, one downstream — and exchange ultrasonic pulses along a single diagonal path through the fluid, alternately with and against the flow. Sound moves faster downstream than upstream, and that transit-time difference is directly proportional to flow velocity. Sensors mount in V-method or Z-method arrangement to suit the pipe.

Nothing touches the medium: zero pressure drop, no wetted parts, and no process shutdown to install. That makes clamp-on the natural choice for retrofits on live lines, large pipes where inline meters get expensive, and temporary measurements like pump verification and energy audits.

FIG. 06 / CROSS-SECTION

SECTION A-A

02 — Sensor Selection

Three sensors. One transmitter.
Your pipe range decides.

The AUFM-100 transmitter pairs with clamp-on sensors in three sizes. Base price includes one sensor of your choice — add a second or third to extend your range. Ranges overlap, so adjacent sensors cover intermediate pipes.

S-1

Small Sensor

DN25 – DN80

1" – 3"

For small process lines, dosing loops, and utility piping.

S-2

Medium Sensor

DN50 – DN700

2" – 28"

For the majority of plant and distribution piping.

S-3

Large Sensor

DN300 – DN2000

12" – 80"

For trunk mains, intake lines, and large infrastructure.

Coverage · DN25 – DN2000 (log scale)

Small

DN25DN80

Medium

DN50DN700

Large

DN300DN2000

One sensor of your choice is included with every AUFM-100. Additional sensors can be added at order time or later — our engineers will confirm the right set for your pipe schedule at quote time.

Applications

Where the AUFM-100 earns its place.

Water & Wastewater

Energy Audits

HVAC / BTU

Chemical

Large Pipelines

Pump Verification

Irrigation

Retrofit Metering

03 — Technical Specifications

Full specifications —
AUFM-100

The complete technical envelope for the AUFM-100 platform. Material and option combinations are configured per application — request a quote with your process details for a tailored configuration.

Measurement

Principle	Transit time, clamp-on ultrasonic sensors
Accuracy	±1% – ±2%
Sensor options	Small (DN25–DN80) / Medium (DN50–DN700) / Large (DN300–DN2000), one included in base price

Process Conditions

Line size	DN25 to DN2000 (1" to 80"), sensor-dependent
Process temperature	−30°C to +160°C (sensor dependent)
Ambient temperature	−20°C to 60°C

Electronics

Output signals	RS485, 4–20mA, Pulse
Power supply	230V AC or 24V DC (wall-mounted) / Battery (portable variant)
Protection class	IP67 (display) / IP68 (sensors)
Approvals	CE, ISO 9001

04 — Configurations

Choose the right configuration
for your installation.

AUFM-100 — Clamp-On (Wall-Mounted)

Fixed installation with wall-mounted transmitter. RS485, 4–20mA, and Pulse outputs for permanent monitoring and integration. 230V AC or 24V DC supply.

Fixed / 230V AC · 24V DCRequest quote for this variant→

APUFM-100 — Portable

Battery-powered handheld unit in a carry case. Clamp on, measure, move on — built for surveys, audits, and short-term measurement at remote locations.

Portable / Battery poweredRequest quote for this variant→

05 — Resources