# RBBF Inline Ultrasonic Flow Meter

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> R&B Instrument Inc..

## Facts

- **Model:** RBBF
- **Category:** Ultrasonic Flow Meter
- **Canonical page:** https://www.rbflowmeter.com/products/rbbf-inline-ultrasonic-flow-meter
- **Language:** en
- **Last updated:** 2026-10-18
- **Brand:** R&B Instrument Inc.

## Overview

Inline flanged transit-time ultrasonic flow meter for industrial water and process liquids, factory calibrated with no moving parts and zero pressure drop.

## Description

### Product Overview

The RBBF is an inline, flanged transit-time ultrasonic flow meter for industrial water and process liquids. Every unit leaves the factory calibrated, so no field setup is required, and the full-bore design has no moving parts and zero pressure loss.

Bi-directional measurement with high resolution, up to 2 GB of event logging and IP68 rating make the RBBF suitable for flooded pits, plant utilities and custody-transfer style monitoring.

## Specifications

| Parameter | Value |
| --- | --- |
| Diameter | DN15 – DN1000 (flange or thread) |
| Pressure | DN50–DN300: 1.6 MPa; DN350–DN600: 1.0 MPa; DN700–DN1000: 0.6 MPa |
| Output signal | RS485 (Modbus RTU), 4–20 mA, pulse, M-Bus; relay/RS232/datalogger optional |
| Power supply | Built-in lithium battery (10 years) or 24 VDC / 220 VAC |
| Protection | IP68 (optional) |
| Pipe material | Carbon steel, stainless steel, cast iron |

## Key specifications

- Accuracy: Factory calibrated
- Pipe size: DN15 ~ DN1000
- Output signal: RS485 Modbus RTU, 4-20mA, pulse, M-Bus (relay/RS232/datalogger optional)

## Features

- Factory calibrated; no field setup required.
- No moving parts; full-bore design with zero pressure drop.
- Bi-directional flow measurement with high resolution.
- Up to 2 GB event data logger; positive/negative/net totalizers.
- Easy recalibration and hot-tap without process interruption.
- IP68 rated for flooded pits and harsh outdoor installation.

## Contact

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