# RBFM-EX3 Compact Clamp-on Micro Ultrasonic Flow/Heat Meter

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## Facts

- **Model:** RBFM-EX3
- **Category:** Ultrasonic Flow Meter
- **Canonical page:** https://www.rbflowmeter.com/products/rbfm-ex3-compact-clamp-on-ultrasonic-flow-heat-meter
- **Language:** en
- **Last updated:** 2026-10-18
- **Brand:** R&B Instrument Inc.

## Overview

Compact non-invasive clamp-on transit-time ultrasonic meter for DN10–DN100 small pipes, measuring flow and heat with quick clip-on installation.

## Description

### Product Overview

The RBFM-EX3 is a compact clamp-on transit-time ultrasonic meter for small pipes from DN10 to DN100. Fixed sensor spacing makes installation plug-and-play: clip the transducers on copper, plastic, steel, iron or stainless steel pipe and the meter is ready — no cutting, no downtime, no pressure loss.

Flow rate and thermal energy are measured simultaneously, making the EX3 equally suitable for process monitoring and HVAC sub-metering in tight installation spaces.

## Specifications

| Parameter | Value |
| --- | --- |
| Diameter | DN10 – DN100 |
| Accuracy | ±1.0% standard |
| Temperature | Fluid 0–50°C or 0–150°C (remote type) |
| Output signal | RS485 Modbus, 4–20 mA, pulse/OCT; optional alarm and LoRaWAN |
| Power supply | 24 VDC (10–36 VDC) |
| Protection | IP67 |
| Installation | Clamp-on, fixed sensor spacing, 2 m cable |

## Key specifications

- Accuracy: ±1.0%
- Pipe size: DN10 ~ DN100
- Output signal: RS485 Modbus, 4-20mA, pulse/OCT (LoRaWAN optional)

## Features

- Non-invasive clamp-on installation without pipe cutting.
- Fixed sensor spacing for plug-and-play use.
- Measures flow rate and heat/cooling energy simultaneously.
- No moving parts and no pressure loss.
- Compact design for narrow installation spaces.
- Compatible with copper, plastic, steel, iron and stainless steel pipes.

## Contact

For pricing, lead time and customization, contact R&B Instrument Inc. via the product page above.