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.
Working closely with plant engineers in the region, 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 supplied through Seven Star LLC comes with manufacturer documentation and access to local technical support – helping facility engineers and procurement teams in Muscat, Sohar, and Salalah receive a correctly specified KROHNE OPTISONIC 3400 instrument.
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.
With fast quotation turnaround and technical support, 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.
| Parameter | Specification |
|---|---|
| Model | KROHNE OPTISONIC 3400 |
| Measuring Principle | 3-beam ultrasonic transit-time (bi-directional) |
| Nominal Diameter Range | DN25 / 1″ – DN3000 / 120″ |
| Accuracy | ±0.3% of measured value (typical); ±0.3% +2 mm/s |
| Signal Converter | KROHNE UFC 400 (compact or remote mount) |
| Process Temperature | -200°C to +250°C (-328°F to +482°F) |
| Pressure Classes | ANSI 150 to 900 |
| Fluid Compatibility | Conductive and non-conductive liquids, up to >1000 cSt viscosity |
| Approvals | ATEX, IECEx, cCSAus, NEPSI |
| Diagnostics | NAMUR NE 107, per-path velocity of sound measurement |
| Typical Applications | Chemical, petrochemical, oil & gas, power generation, water utilities |
Request a Quote for KROHNE OPTISONIC 3400 Ultrasonic Flowmeter
Seven Star LLC supports the full procurement cycle for the KROHNE OPTISONIC 3400 ultrasonic flowmeter, from formal RFQ submission to availability and lead-time confirmation, technical datasheet delivery, and direct consultation with our instrumentation division on sizing, converter configuration, and material selection for your application. With engineering support in Muscat, we supply every KROHNE OPTISONIC 3400 flowmeter on request with manufacturer documentation and dependable local technical support. Contact Seven Star LLC today to request a quotation or discuss your flow measurement project.
Related Products
- Datasheet KROHNE OPTISONIC 3400 Ultrasonic Flowmeter Datasheet Download
KROHNE product families on this page
KROHNE names its instruments by measuring principle, which makes a tag list easy to read:- OPTIFLUX and WATERFLUX: electromagnetic flowmeters, such as OPTIFLUX 2300, OPTIFLUX 4300 and WATERFLUX 3070 for water networks
- OPTISONIC and ALTOSONIC: ultrasonic flowmeters, including the inline OPTISONIC 3400, the clamp-on OPTISONIC 6300, the OPTISONIC 7300 for gas and the ALTOSONIC V12 for custody transfer of gas
- OPTIMASS: Coriolis mass flowmeters such as OPTIMASS 1400 and 6400
- H250 M40 and DK800: variable area flowmeters
- OPTIWAVE and OPTIFLEX: radar and guided radar level transmitters
Where KROHNE flowmeters and level transmitters are used
Typical duties in the GCC are produced water and injection water metering, potable water and wastewater networks, fuel gas and sales gas measurement, chemical dosing, and tank level in terminals and process units. Coriolis meters cover mass flow and density on hydrocarbons, while electromagnetic meters need a conductive liquid.Ordering KROHNE instruments: what we need
Send the full type code and serial number from the nameplate, or a clear photo of it. For a new KROHNE flow meter we need line size and flange rating, liner and electrode material for electromagnetic types, fluid, flow range, pressure and temperature, power supply, output and protocol, and the hazardous area approval required. We check the code against KROHNE documentation before quoting and provide the manufacturer's datasheet and certificates on request.Browse KROHNE products by category: Flowmeters, Level Transmitter, Flow Computers.
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