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High Performance Flow Meter
Coriolis Method

The OPTIMASS 6400 is the standard high-performance Coriolis mass flowmeter for advanced ship fuel applications in the marine industry, including fuel consumption monitoring of MGO, MDO, LNG and other liquids.

The OPTIMASS 6400 is the standard high-performance Coriolis mass flowmeter for the process industry.

By measuring forces perpendicular to the direction of motion and the axis of rotation, this Coriolis flow meter offers very high accuracy compared to restriction, electromagnetic and thermal equivalents. The Coriolis force causes the fluid to deflect slightly and this deflection is measured by highly accurate sensors to calculate flow rate.

Key Features

Key Features

The twin bent tube meter offers superior performance and high accuracy in virtually any application: From process control, for example, in (petro)chemical applications to concentration measurements in the food and beverage industry to custody transfer filling and transport measurements in the oil and gas industry.

Firstly, Its high-end options also make the OPTIMASS 6400 the optimum device for cryogenic media like Liquefied Natural Gas (LNG) with temperatures down to -200°C / -328°F as well as applications involving high operating temperatures (up to 400°C / 752°F) or pressures (up to 200 barg / 2900 psig).

Secondly, The OPTIMASS 6400 features Entrained Gas Management (EGMTM) for liquid applications, therefore providing reliable readings even in the event of gas entrainment of up to 100%.

In conclusion, the Coriolis device enables continuous and uninterrupted measurement of mass and volume flow, density and temperature – even at difficult process conditions with 2-phase flow.

The meter has various approvals for hazardous areas and is therefore suitable for use in Safety Instrumented Systems (SIL2/3). It comes with extensive diagnostic functions (NE 107) and various digital communication options.

Highlights of Optimass 6400 Flowmeter

  • Twin bent tube design
  • Entrained Gas Management (EGMTM): No loss of measurement with gas entrainment up to 100%
  • Fast and completely digital signal processing
  • Integrated temperature measurement
  • Optimised flow splitter for minimum pressure loss
  • High accuracy mass, density, and volume flow measurement (optional ±0.05% of MV)
  • Highest OIML accuracy class of 0.3 for custody transfer (CT)
  • Extensive sensor and process diagnostics (incl. NE 107)
  • Available in three different sensor materials (incl. Duplex and alloy 22)
  • Many options (heat tracing, purge port, etc.)
  • Self-draining when mounted vertically
  • Immunity to crosstalk: resistant to installation and process effects
  • On-site verification of flowmeter with OPTICHECK service tool possible

Typical Applications of Optimass 6400 Flowmeter

  1. General
  • Liquids with transient gas entrainment
  • Cryogenic or high temperatures (-200…+400°C /-328…+752°F)
  • Super critical gases
  • Custody transfer (CT)

2. Chemical and other process industries

  • Concentration and density measurement
  • Bulk loading
  • Batching and blending to reactors
  • Hydrocarbon cracking

3. Oil and gas industry

  • Metering skids, bulk loading, pipeline transfer
  • “Bypass” density measurement
  • Liquefied Natural Gas (LNG)
  • Bulk loading
  • In-line density measurement
  • Multiphase measurement in upstream applications

4. Food and beverage industry

  • Batching, dosing, filling
  • Mass flow measurement of ice cream and milk (e.g. at the raw milk reception)
  • Measurement of flow, density, specific gravity in brewing processes
  • Dosing of hop extract
  • Measurement of Brix, density, and flow in fruit juices
  • Dosing of natural oils, grease, vegetables (e.g. spinach), etc.
  • CO2 injection in soft drink production

5. Pharmaceutical industry

  • Batching, dosing, filling
  • Solvent extraction

6. Marine industry

  • Bunkering and fuel consumption measurement

7. Pulp and paper industry

  • Additives, bleaches, and colourants
  • Crystallising, solidifying and cryogenic products

Technical Documentation of Optimass 6400 Flowmeter

To view technical documentation for this product, follow this link to the Krohne’s website:

Product Dimensions

  • Mass, density and volume flow of gases and liquids; maintains operation even with entrained gas of up to 100%
  • Also certified for hygienic use
  • Flange: DN15…100 / 12…4″, max. PN100 / ASME Cl 600; many hygienic fittings
  • 3 x 4…20 mA, HART®7, FF, Profibus-PA/DP, Modbus, PROFINET etc.

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    • High accuracy (±0.05% flat)
    • Marine approvals: DNV GL, CCS, LR, ABS, CCS, RINA, KR
    • Mass flow, volume flow and density measurement for fuel consumption monitoring of MGO, MDO, LNG and other liquids
    • Flange: DN10…300 / 12…12″, max. PN 160 / ASME Cl 1500
    • 3 x 4…20 mA, HART®7, Modbus, FF, Profibus-PA/DP, PROFINET





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