# RBFM-I Insertion Ultrasonic Flow/Energy Meter

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> R&B Instrument Inc..

## Facts

- **Model:** RBFM-I
- **Category:** Ultrasonic Flow Meter
- **Canonical page:** https://www.rbflowmeter.com/products/rbfm-i-insertion-ultrasonic-flow-energy-meter
- **Language:** en
- **Last updated:** 2026-10-18
- **Brand:** R&B Instrument Inc.

## Overview

Hot-tapped insertion transit-time ultrasonic meter for accurate bi-directional liquid flow measurement without pipeline interruption, moving parts or pressure drop.

## Description

### Product Overview

The RBFM-I is installed under pressure through a hot-tap insertion probe, so the pipeline never has to be stopped or drained. Transit-time measurement covers DN80 to DN6000 with bi-directional flow from 0 to ±12 m/s and no moving parts in the stream.

Signal-quality tracking and self-adjustment keep accuracy at ±1.0% of reading above 0.5 m/s, while an optional SD-card logger records up to 64 GB of flow history.

## Specifications

| Parameter | Value |
| --- | --- |
| Diameter | DN80 – DN6000 |
| Accuracy | ±1.0% of reading (>0.5 m/s); ±2.0% (<0.5 m/s) |
| Velocity | 0 ~ ±12 m/s, bi-directional |
| Temperature | Liquid -40°C ~ +160°C |
| Output signal | 4–20 mA, OCT pulse, relay, RS232C/RS485; Modbus and data logger optional |
| Power supply | 115/230VAC; optional 10–28 VDC or 12 VDC solar |
| Protection | IP66 |

## Key specifications

- Accuracy: ±1.0% of reading (>0.5 m/s), ±2.0% (<0.5 m/s)
- Pipe size: DN80 ~ DN6000
- Output signal: 4-20mA, OCT pulse, relay, RS232C/RS485 (Modbus, data logger optional)

## Features

- Hot-tapped installation, no pipeline flow interrupted.
- No moving parts, no pressure drop, no maintenance.
- One meter suits a wide pipe range from DN80 to DN6000.
- Signal quality tracking and self-adjusting functions.
- Optional up to 64 GB SD card data logger.
- Spool-piece transducer option for accuracy better than ±1.0% of reading.

## Contact

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