KROHNE MFC 400 EN - Manual (Page 98)

6
OPERATION
98
MFC 400
www.krohne.com 08/2013 - 4002075802 - MA MFC 400 R02 en
In most cases, the amplitude of this vibration is below the low flow cutoff and thus does not affect
the measurement. In very few cases, the amplitude is greater than the low flow cutoff (over-
vibration) and can cause errors with the counter values.
The pressure suppression function eliminates this effect by activating a larger low flow cutoff
level for a short period of time. The pressure suppression is activated when the flow falls below
the standard low flow cutoff level for the first time. For a programmable period of time, (can be
programmed in menu C1.3.2), the pressure suppression threshold is added to the standard low
flow threshold (can be set in menu C1.3.3).
The optimal setting values for pressure suppression depend on the current operating conditions
and can thus only be determined on-site through testing.
Figure 6-9: Amplitude behaviour
1 Low flow cutoff
2 Low flow cutoff
3 Pressure suppression
4 Pressure suppression
.book Page 98 Monday, August 26, 2013 9:05 AM