KROHNE MFC 300 EN - Manual (Page 109)

OPERATION
6
109
MFC 300
www.krohne.com 02/2012 - 4000498602 - MA MFC 300 R03 en
6.5.12 2 phase threshold (Menu C1.5.3)
The threshold for the 2 phase signal can be set in this menu item. This makes it possible to
output a status signal indicating the presence of gas bubbles in the process. There are no default
values for this threshold. This means that the operator must adapt this value to suit his
application. This can be done, for example, by programming the 2 phase signal at the current
output and registering which threshold makes sense for the respective process for a certain
time period.
Example regarding the detection and notification of a two-phase disturbed flow (e.g.
gas bubbles in paints):
The 2 phase signal is displayed on the 2nd measuring page at the bottom with e.g.: 0.02%. If the
threshold is exceeded (C3.4.2), a message is sent via terminals C.
Fct. Display Description and setting
B2.13 2 Phase Signal The 2-phase signal value can be read and
transferred to Diagnosis 1.
C1.5.3 2 Ph. Threshold Only input a value here if an error message
is to be generated.
This error message be output via the status
outputs.
The error message is then indicated on the
display as S: Out of specification S: Out of specification S: Out of specification S: Out of specification and
S: 2 phase flow S: 2 phase flow S: 2 phase flow S: 2 phase flow.
Warning: Take into account the setting of
the error conditions of the current output!
C1.5.4 Diagnosis 1 Set "2 Phase Signal".
C3.1.3 Terminals C Set "Limit Switch".
C3.4.1 Measurement Set "Diagnosis 1".
C3.4.2 Threshold e.g. set to "2.0 ± 0.2%".
C3.4.3 Polarity e.g. Set "Absolute Value".
C3.4.4 Time Constant Set as needed.
C3.4.4 Invert Signal Set as needed.
C6.4.1 2nd Meas. Page Set "Three Lines".
C6.4.10 3rd Line Variable Set "Diagnosis 1".
C6.4.11 3rd Line Format Set "X.XX".
.book Page 109 Monday, February 6, 2012 11:01 AM