wtw inoLab Cond 730, Operating Manual

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Cond 730 Operation
25
4.3 Determining/setting up the cell constant [C]
Why determine/set
up the cell
constant?
Due to ageing, the cell constant slightly changes. As a
result, an inexact measured value is displayed. Calibration
determines the current value of the cell constant and stores
this value in the instrument.
Thus, you should calibrate at regular intervals.
You can determine the cell constant of the conductivity mea-
suring cell in the range 0.450 ... 0.500 cm
-1
or
0.800 ... 1.200 cm
-1
by calibrating in the control standard or
set it up manually in the range 0.250... 2.500 cm
-1
or
0,090 ... 0,110 cm
-1
.
Additionally, you can select the fixed cell constant
0.010 cm
-1
.
4.3.1 Determining the cell constant (calibrating)
Determining the cell
constant
(calibration in
control standard)
Determine the cell constant as follows:
1 Press the
c
key repeatedly until LF CELL appears
on the display.
2 Press the
g
key.
3 Press the
c
key repeatedly until the following is
displayed.