KROHNE OPTISONIC 3400 Ultrasonic Flowmeter

Overview

KROHNE OPTISONIC 3400 is a 3-beam, inline ultrasonic flowmeter engineered as a true multi-purpose instrument for liquid measurement across the full range of industrial process conditions. Building on decades of KROHNE’s experience as a leading supplier of ultrasonic in-line process flowmeters, the KROHNE OPTISONIC 3400 measures both conductive and non-conductive liquids with equal accuracy, spanning simple aqueous fluids to highly viscous oils exceeding 1000 cSt, cryogenic media as low as -200°C, and process temperatures up to +250°C, all from a single flow sensor platform.

As the official authorized partner and exclusive regional representative for KROHNE, Seven Star LLC proudly supplies the KROHNE OPTISONIC 3400 ultrasonic flowmeter to chemical, petrochemical, oil and gas, and utility customers across Oman and the wider GCC. Every unit shipped through Seven Star LLC carries full manufacturer warranty, genuine KROHNE calibration certification, and access to local technical support – ensuring facility engineers and procurement teams in Muscat, Sohar, and Salalah receive a factory-correct KROHNE OPTISONIC 3400 instrument backed by regional service.

Measurement Principle

The KROHNE OPTISONIC 3400 measures flow using the ultrasonic transit-time principle across three parallel acoustic paths. Ultrasonic transducers mounted on the flow sensor body send signals both with and against the direction of flow; the difference in transit time between the two directions is directly proportional to the average flow velocity, which the signal converter uses to calculate volumetric or mass flow. Because the three-beam design measures continuously across multiple chords rather than a single path, the KROHNE OPTISONIC 3400 compensates for asymmetric flow profiles and delivers accurate, bi-directional readings starting from very near zero flow.

This measuring principle gives the KROHNE OPTISONIC 3400 several practical advantages that matter on real installations. The sensor has a completely welded, full-bore construction with no moving parts and no obstructions in the flow path, so it introduces virtually no pressure drop and requires no routine maintenance. A distinctive diagnostic capability of the OPTISONIC 3400 is its free measurement of velocity of sound per acoustic path, which can reveal liquid contamination or changing process conditions long before they would otherwise be detected, in addition to standard NAMUR NE 107-compliant self-diagnostics that continuously monitor sensor and process health.

Engineering Design of the KROHNE OPTISONIC 3400

The KROHNE OPTISONIC 3400 sensor is completely welded for wear- and maintenance-free service, with a nominal diameter range spanning DN25 / 1″ for precision dosing applications up to DN3000 / 120″ for large water transportation pipelines. The flow sensor pairs with the advanced UFC 400 signal converter, offered in both compact (converter mounted directly on the sensor) and remote (separate converter connected via signal cable) configurations, and supports a full range of process I/O and communication protocols to fit existing plant control architecture.

The signal converter’s user interface uses optical or push-button controls with a clear display for straightforward local configuration, and the transmitter is available with hazardous area approvals including ATEX, IECEx, cCSAus, and NEPSI for installation across a wide range of industrial classifications. Pressure classes from ANSI 150 through 900 and process connections in multiple flange and material standards allow the KROHNE OPTISONIC 3400 to be specified precisely to the pipeline and process requirements of a given project.

Key Features

The KROHNE OPTISONIC 3400 combines broad application coverage with a level of self-diagnostic insight that distinguishes it from conventional ultrasonic flowmeters, and this versatility is exactly why the KROHNE OPTISONIC 3400 has become a standard choice across process industries.

• A 3-beam acoustic path design delivers accurate bi-directional flow measurement, starting at nearly zero flow, even under asymmetric flow profiles.
• Completely welded, full-bore, unobstructed construction eliminates moving parts, pressure loss, and routine maintenance requirements.
• Free-of-charge velocity of sound measurement per acoustic path provides early warning of liquid contamination or process changes.
• A wide nominal diameter range from DN25 / 1″ to DN3000 / 120″ covers dosing applications through large transportation pipelines.
• The sensor measures both conductive and non-conductive liquids, including highly viscous fluids exceeding 1000 cSt.
• Operating range extends from cryogenic conditions at -200°C to high process temperatures up to +250°C within a single platform.
• NAMUR NE 107-compliant diagnostics continuously monitor sensor health, process conditions, and measurement quality.
• Hazardous area approvals including ATEX, IECEx, cCSAus, and NEPSI support deployment across diverse regulatory environments.

Industrial Applications

The KROHNE OPTISONIC 3400 is deployed across chemical and petrochemical processing, oil and gas midstream measurement, power generation, and water utility applications wherever accurate, low-maintenance flow measurement of conductive or non-conductive liquids is required. Typical duties include make-up water, boiler feed water, and demineralized water in utility plants, custody-adjacent allocation measurement during on/off-loading, and high turndown ratio applications such as transportation pipeline metering.

As the officially authorized partner for KROHNE, Seven Star LLC distributes the KROHNE OPTISONIC 3400 to refineries, petrochemical complexes, and water utility operators throughout Oman and the GCC. The flowmeter is a strong fit for the midstream oil measurement and process metering needs of the Sohar and Salalah economic zones, as well as for power generation and desalination facilities across Muscat that require dependable ultrasonic flow measurement across a wide range of liquid types and process conditions.

Technical Specifications

The table below summarizes the core specifications of the KROHNE OPTISONIC 3400 ultrasonic flowmeter as supplied by Seven Star LLC.

Call To Action

Seven Star LLC supports the full procurement cycle for the KROHNE OPTISONIC 3400 ultrasonic flowmeter, from formal RFQ submission to regional warehouse stock availability, technical datasheet delivery, and direct consultation with our instrumentation division on sizing, converter configuration, and material selection for your application. As the authorized partner for KROHNE in Oman and the GCC, we ensure every KROHNE OPTISONIC 3400 flowmeter is delivered with full manufacturer warranty, calibration documentation, and dependable local technical support. Contact Seven Star LLC today to request a quotation or discuss your flow measurement project.