KROHNE OPTIMASS 6400 Coriolis Mass Flowmeter

Overview

KROHNE OPTIMASS 6400 is a high-performance Coriolis mass flowmeter engineered for demanding process applications where cryogenic media, high temperature, high pressure, or entrained gas would defeat a conventional Coriolis meter. Built around a twin bent tube sensor combined with the KROHNE MFC 400 signal converter, the OPTIMASS 6400 is the first Coriolis mass flowmeter to feature Entrained Gas Management (EGM), delivering continuous, accurate measurement even with gas entrainment up to 100% of volume – a capability that keeps custody transfer, LNG, and cryogenic operations running without the false readings or dropouts common to standard mass flow sensors.

As the official authorized partner and exclusive regional representative for KROHNE, Seven Star LLC proudly supplies the OPTIMASS 6400 Coriolis mass flowmeter to petrochemical, oil and gas, and food and beverage 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 instrument backed by regional service.

Measurement Principle

The KROHNE OPTIMASS 6400 measures mass flow directly using the Coriolis effect. Process fluid is routed through the sensor’s twin bent measuring tubes, which are driven into oscillation at their natural resonant frequency. As fluid moves through the vibrating tubes, the Coriolis force induces a phase shift between the tube’s inlet and outlet sections that is directly proportional to mass flow rate, while the resonant frequency itself shifts in relation to fluid density. Because this measurement is derived from the physical mass of the fluid rather than its volume, the OPTIMASS 6400 delivers mass flow, density, volume flow, and concentration from a single sensor, independent of temperature, pressure, or fluid composition changes.

What sets the KROHNE OPTIMASS 6400 apart is its Entrained Gas Management (EGM) capability. In conventional Coriolis sensors, relative movement between gas bubbles and liquid dampens the tube’s oscillation amplitude and interferes with the electronics’ ability to determine the true resonant frequency, causing measurement dropout. EGM continuously adapts the tube driver oscillation to follow varying fluid conditions, maintaining a real measured reading together with a configurable alarm that flags transient gas entrainment – turning what would be a process disruption on other meters into actionable diagnostic information.

Engineering Design of the KROHNE OPTIMASS 6400

The OPTIMASS 6400 sensor uses a twin bent tube design available in 316L stainless steel, Hastelloy C-22, or Duplex UNS S31803, in sizes from DN08 to DN100 (with DN150 to DN250 available). This construction supports operating temperatures from -200°C to +400°C (-328°F to +752°F) and pressures up to 200 bar / 2900 psig, covering everything from cryogenic LNG transfer to high-temperature process duties within one meter platform. The sensor is self-draining when mounted vertically and is available with optional heat tracing, purge ports, and insulation or heating jackets for temperature-sensitive products.

Paired with the KROHNE MFC 400 signal converter – available in compact or remote mount configurations – the OPTIMASS 6400 supports HART, FOUNDATION Fieldbus, Modbus, and PROFIBUS communication, along with secure wireless Bluetooth access for commissioning, verification, and diagnostics without opening the enclosure. An extensive onboard diagnostics package continuously monitors medium temperature, density, concentration, and driver amplitude, flagging installation errors or process changes as they occur rather than after the fact.

Key Features

The KROHNE OPTIMASS 6400 Coriolis mass flowmeter combines extreme-condition durability with measurement intelligence that few mass flow sensors can match, which is why the KROHNE OPTIMASS 6400 remains a preferred choice for demanding custody transfer and cryogenic applications.

• Entrained Gas Management (EGM) maintains continuous, accurate mass flow measurement even with gas entrainment up to 100% of volume.
• The twin bent tube sensor operates across an exceptional range from -200°C to +400°C, covering cryogenic LNG and high-temperature process duties from one platform.
• Pressure capability up to 200 bar / 2900 psig supports demanding custody transfer and oil and gas transport applications.
• Sensor materials include 316L stainless steel, Hastelloy C-22, and Duplex UNS S31803 for compatibility with corrosive and abrasive process fluids.
• A single sensor simultaneously measures mass flow, density, volume flow, and concentration without additional instrumentation.
• Secure wireless Bluetooth access enables commissioning, verification, and diagnostics without interrupting the process or opening the enclosure.
• Multi-protocol communication via HART, FOUNDATION Fieldbus, Modbus, and PROFIBUS simplifies integration into existing control systems.
• The optimized flow splitter design minimizes pressure loss while the self-draining vertical mounting orientation supports hygienic and food-grade process requirements.

Industrial Applications

Process engineers across the region specify the KROHNE OPTIMASS 6400 because it is deployed across petrochemical process control, custody transfer filling and transport measurement in oil and gas, concentration measurement in food and beverage production, and cryogenic LNG handling wherever accurate, entrained-gas-tolerant mass flow measurement is essential. Its wide temperature and pressure envelope also makes it well suited to hydraulics flow, boiler feedwater, and general process industries where fluid conditions vary significantly during operation.

As the officially authorized partner for KROHNE, Seven Star LLC distributes the OPTIMASS 6400 to refineries, petrochemical complexes, and industrial gas terminals throughout Oman and the GCC. The flowmeter is a strong fit for the custody transfer and process metering needs of the Sohar and Salalah economic zones, as well as for LNG and industrial gas facilities across the region that require dependable mass flow data even under high entrained gas or extreme temperature conditions.

Technical Specifications

The table below summarizes the core specifications of the KROHNE OPTIMASS 6400 Coriolis mass flowmeter, giving buyers of the KROHNE OPTIMASS 6400 a single reference for sizing and material selection.

Call To Action

Ordering the KROHNE OPTIMASS 6400 through Seven Star LLC is straightforward: our team supports the full procurement cycle for the KROHNE OPTIMASS 6400 Coriolis mass flowmeter, from formal RFQ submission to regional warehouse stock availability, technical datasheet delivery, and direct consultation with our instrumentation division on sensor sizing, material selection, and converter configuration for your application. As the authorized partner for KROHNE in Oman and the GCC, we ensure every OPTIMASS 6400 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 mass flow measurement project.