KROHNE MFC 400 EN - Manual (Page 97)

OPERATION
6
97
MFC 400
www.krohne.com 08/2013 - 4002075802 - MA MFC 400 R02 en
6.5.10 Pressure suppression
The pressure suppression eliminates any disruption in the measurement in the event of an
abrupt flow switch-off e.g. when valves are suddenly closed. In such cases, surges may occur in
the pipe and in the measuring device which could lead to over-vibration. The flow then "swings"
back and forth before a stable zero flow is established, as shown in the figure below. This effect
occurs mainly in high pressure applications.
Figure 6-8: Vibration behaviour during pressure suppression
1 Flow switched off
2 Sinusoidal vibration ("over-vibration")
3 Stable zero flow
.book Page 97 Monday, August 26, 2013 9:05 AM