Process Unit 73 LF - Knick

17 Technical Terms
2-electrode cell
3-wire configuration
4-electrode cell
Administrator level
administrator passcode
alarm limit
cal
Calibration menu
calibration passcode
calibration sequence
cell
cell constant
cell standardization
cleaning
Conductivity cell with 2 (voltage) electrodes; suitable
for measuring low conductivities
Connection of the temperature probe with a (third)
sense line to compensate for the lead resistances;
required for exact temperature measurement with
long leads
Conductivity cell with 4 (2 current and 2 voltage)
electrodes; suitable for measuring high conductivities
”adm” – menu level of parameter setting. All
instrument settings and the passcodes can be
edited.
Protects access to Administrator level; can be
edited on the Administrator level
For each measured variable, you can define high
and low warning and failure limits, respectively.
Alarm can be activated individually for each variable.
When an alarm limit is exceeded, an error
message will be displayed and the corresponding
NAMUR contact will be activated.
Menu key for Calibration menu
Menu for calibrating the cell
Protects access to calibration; can be edited or
disabled on the Administrator level
From the Calibration menu, you can select four
sequences:
automatic calibration,
calibration with manual input of conductivity,
input of cell constant,
sample calibration.
2-electrode or 4-electrode cells can be connected.
The cell constant of the cell in use must be entered
or automatically determined.
c = d / A (theoretical)
d: distance between electrodes
A: electrode surface
Automatic determination or manual entry of cell
constant
User defined time during which the cleaning contact
is closed during a rinsing cycle.
Technical Terms 17–1