Mass Measurement


High performance flowmeter for the process industry

July 2016 Mass Measurement

Krohne has introduced the new Optimass 6400, enhancing its portfolio of Coriolis mass flowmeters with a twin bent tube Coriolis mass flowmeter to meet standard liquid and gas applications in the chemical and petrochemical, oil and gas, pharmaceutical, food and beverage and power industries.

The Optimass 6400 features advanced entrained gas management (EGM). In the past, gas entrainments in liquid media presented a 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 some 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 the instrument continues to present an actual measured reading, together with an indication or configurable alarm for the user. This indication helps to improve processes by identifying transient gas entrainments.

Compliant to NAMUR standard installation lengths, the unit is available in sizes DN 8-250 and covers high temperatures up to 400°C / 752°F, as well as cryogenic applications down to -200°C. It also handles pressures up to 200 bar.

Approved for custody transfer

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 instrument suitable for process industries and specialist applications like LNG, CNG or supercritical gases in terminal or storage/bunkering, along with custody transfer applications. It 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 MFC 400 incorporates state-of-the-art digital electronics. The fast digital signal processing of the MFC 400 provides the EGM feature, as well as an outstanding dynamic density measurement. Together they provide an accurate volume flow output and mass measurement.



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