Endress+Hauser mypro CLD 431, Руководство по эксплуатации

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5.5 Polarisation detection
Conductive conductivity measuring cells are
characterised by a limited measuring range
which mainly depends on the cell constant.
However, the exact application range limits
of a measuring cell also depend on other
factors, such as, for example, frequency of
measurement, electrode material, coating on
electrode and medium to be measured, all of which complicate the determination of
the application limit. The MyPro CLM 431 /
CLD 431 transmitter employs a procedure
permitting direct measurement of the polarisa-
tion effect. This method evaluates signals and
issues an alarm whenever the cell constant
has changed by more than 5% due to polari-
sation effects.
5.6 Diagnosis
Function group
DIAGNOSIS
This function group can be used to define
the error current assignments for each
individual error and to disable (lock) field operation.
Function/display
Matrix
VH
1)
Description
Setting
Default Customer
Selection of
diagnostic code
VH
80
Selection of a diagnostic (error) code (see chapter 7.2).
Value range:
E 1 ... E 150
1
Error status
VH
81
Display of status for selected diagnostic code.
Note:
The error status can be evaluated with the
hand-held HART
®
terminal or with the
Commuwin II user interface.
Value range:
0 = inactive
1 = active
depending on
code
■
Operating level 2
Function group
BASIC MONITORING FUNCTIONS
Function/display
Matrix
VH
1)
Description
Setting
Default Customer
Polarisation
monitoring
VH
70
Switches the polarisation monitoring function on or off.
Note:
If polarisation monitoring is on and polarisation
is detected, then error message E071
„Polarisation error“ is signalled (does not
appear for M
Ω
measurement)
Value range:
On
Off
on
LM431CE5.CHP
mypro CLM 431 / CLD 431 conductive Functional description
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