High Accuracy & Range: Up to ±0.05% flat accuracy for extreme media (-200°C to +400°C / -328°F to +752°F).
Entrained Gas Management (EGM™): Maintains stable measurement with up to 100% gas/air entrainment in liquid lines.
Global Compliance & Safety: SIL 2/3 certified; OIML R117 Class 0.3 custody transfer, API, AGA, and hygienic approvals.
Flexible Connections: Flanged DN10…300 / ½…12″, max. PN 160 / ASME Cl 1500; hygienic clamp/ferrule options.
Digital Communications: 4…20 mA, HART® 7, Modbus RTU, FOUNDATION™ Fieldbus, Profibus-PA/DP, PROFINET, EtherNet/IP™, Bluetooth®.
Home > Products > Coriolis Flowmeter > KROHNE OPTIMASS 6400
The KROHNE OPTIMASS 6400 Coriolis Mass Flowmeter is a high-performance twin bent tube flow sensor designed for advanced process control, custody transfer (CT), and extreme thermal applications ranging from LNG cryogenic fluids (-200°C) up to high-temperature loops (400°C).
Engineered to solve real-world industrial fluid metering challenges, the KROHNE OPTIMASS 6400 Coriolis Mass Flowmeter incorporates patented Entrained Gas Management (EGM™) technology. Unlike traditional meters that drop signals under two-phase flow conditions, the OPTIMASS 6400 maintains continuous mass flow, density, and volume measurement even with 0 to 100% gas entrainment.
Available in three wetted tube materials—Stainless Steel 316L, Duplex, and Alloy 22—this versatile meter delivers unmatched corrosion resistance and mechanical strength across petrochemical refineries, marine fuel skids, food processing plants, and cryogenic LNG terminals globally. If you are comparing different measurement principles for your piping layout, check our Industrial Flow Meter Guide to evaluate Coriolis, electromagnetic, and ultrasonic technologies side by side.
Every KROHNE OPTIMASS 6400 Coriolis Mass Flowmeter is manufactured with extreme mechanical precision to isolate external process vibration and thermal stress.
[High-Resolution Image: KROHNE OPTIMASS 6400 Twin Bent Tube Structure & Sensor Junction Box]
Caption: Dual curved tube architecture minimizes pressure drop and ensures structural integrity up to 200 barg working pressure.
| Product Model | KROHNE OPTIMASS 6400 (Twin Bent Tube) |
|---|---|
| Primary Measurement Principles | Coriolis Mass Flow, Density, Temperature, Volume Flow |
| Mass Flow Accuracy | Standard: ±0.1% of Measured Value (MV) Optional High-Precision: ±0.05% of MV |
| Custody Transfer (CT) Standard | OIML R117-1 / Class 0.3 Accuracy Class |
| Operating Temperature Range | Cryogenic: -200°C (-328°F) to High-Temp: +400°C (+752°F) |
| Maximum Working Pressure | Up to 200 barg / 2900 psig (depending on flange rating) |
| Nominal Sizes Available | DN10 to DN300 (½″ to 12″ Flanged & Hygienic connections) |
| Wetted Sensor Materials | Austenitic Stainless Steel 316L (1.4404), Duplex (1.4462), Alloy 22 (2.4602) |
| Safety & Functional Compliance | SIL 2 / SIL 3 certified (IEC 61508) up to DN200 / 8″ |
| Digital Communications | HART®, Modbus RTU, Profibus-DP/PA, PROFINET, EtherNet/IP™, Bluetooth® |
| Hazardous Area Approvals | ATEX, IECEx, cFMus, NEPSI, UKEX, EAC Ex, INMETRO |
The robust mechanical housing and certified accuracy make the KROHNE OPTIMASS 6400 Coriolis Mass Flowmeter the preferred instrument across demanding industrial sectors:
The OPTIMASS 6400 utilizes KROHNE’s patented Entrained Gas Management (EGM™) algorithms. When air or gas enters liquid media, conventional meters stall because sensor drive power limits are reached. The OPTIMASS 6400 dynamically adjusts drive power and signal processing to maintain continuous measurement even up to 100% gas content.
Yes. The meter is OIML R117-1 Class 0.3 certified for custody transfer and rated for cryogenic temperatures down to -200°C (-328°F), making it an industry standard for LNG bunkering and fiscal transfer systems.
Yes. Using the OPTICHECK Flow Mobile App over a secure Bluetooth® connection, engineers can run zero-point calibration, monitor device health, and perform partial proof tests (PTC) up to 20 meters away without breaking the line connection.
