OPTIMASS 6400: new twin bent tube Coriolis mass flowmeter for liquid and gas applications. Picture: Krohne Messtechnik GmbH
03 August 2012

High performance flowmeter for the process industry

The OPTIMASS 6400 is the world’s first Coriolis mass flowmeter to feature advanced Entrained Gas Management (EGM). In the past, gas entrainments in liquid media presented a huge challenge for mass flowmeters because the relative movement between gas and fluid dampens the amplitude of the measuring tube. This dampening leads to inconsistent sensor amplitudes, which interfere with the electronics’ capability to determine the actual resonant frequency. While other mass flowmeters simply "freeze" their last stable reading to cover this "loss of measurement", the OPTIMASS 6400 with EGM is able to follow and correct for the varying amplitudes. This is achieved for entrained gas up to 100% of volume and continues to present an actual measured reading, together with an indication or configurable alarm for the user. This indication can be very helpful to improve processes by identifying transient gas entrainments.

Compliant to NAMUR standard installation lengths, the OPTIMASS 6400 is available in sizes DN 08...250 and covers high temperatures up to +400°C / 752°F, as well as cryogenic applications down to -200°C / -328°F. It also handles pressures up to 200 bar (2900 psi).

These specifications, together with the unique feature of EGM and custody transfer approvals for both liquids (OIML R-117-1 / MI005) and gases (OIML – R137 / MI002), make the OPTIMASS 6400 suitable for process industries and specialist applications like LNG, CNG or supercritical gases in terminal or storage/bunkering, along with custody transfer applications. The OPTIMASS 6400 is available in stainless steel 316L, Hastelloy® C22 and Duplex steel UNS S31803.

The OPTIMASS 6400 is the first Krohne mass flowmeter to feature the new signal converter MFC 400. The fast, completely digital, signal processing of the MFC 400 provides the EGM feature, as well as an outstanding dynamic density measurement. Together they provide a very accurate volume flow output and mass measurement. The MFC 400 provides enhanced diagnostic and status indications according to NAMUR NE 107 and will subsequently be available for all OPTIMASS mass flowmeters.

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