KROHNE CORIMASS G-MFM 4085 EN - Manual (Page 104)

104
Coriolis forces occur in oscillating systems when a mass moves towards or away from an axis of
oscillation. This is illustrated by way of a simple example.
A measuring tube oscillates about the neutral axis A-B. The fluid particles in the liquid product
flow through the measuring tube at velocity ‘v’.
Between points A and C these fluid particles are accelerated from a lower to a higher rotational
velocity. The mass of these accelerated particles generates Coriolis force F
c opposing the
direction of rotation.
Between points C and B the fluid particles are decelerated which sets up Coriolis forces in the
direction of rotation. These Coriolis forces (Fc) which act upon the two halves of the tube with
opposite direction, are directly proportional to the mass flow.
The Coriolis distortion is extremely small and superposed on the fundamental component of the
measuring tube. The total motion of the measuring tube is picked up by inductive sensors.
A measured value that refers directly to the mass flowrate of the liquid flowing through the
measuring tube is generated by appropriate signal processing.
12. Software History
Release Date Hardware Firmware Installation/ Operating
Manual
3/94 to 7/97 MFM 4085 K Up to G 2.20 7.02194.31 (GB)
7.02194.71 (USA)
7/97 to 10/97 MFM 4085 K+F U 2.21 to U 2.27 7.02194.31 (GB)
7.02194.71 (USA)
plus G+ Addendum
10/97 MFM 4085 K+F G 3.00 7.02194.31 (GB)
7.02194.71 (USA)
plus G+ Addendum
11/97 MFM 4085 K+F G 3.01 7.02194.31 (GB)
7.02194.71 (USA)
plus G+ Addendum