SCHOTT CG 853P, Operating Manual

Page: 30 / 76

Operation
106
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 manu-
ally in the range 0.250... 2.500 cm
-1
. Additionally, you can
select one of the fixed cell constants 0.1 cm
-1
or 0.01 cm
-1
.
Determining the cell
constant
(calibration in
control standard)
Determine the cell constant as follows:
1 Press the <CAL> key repeatedly until LF CELL ap-
pears on the display.
2 Press the <run/enter> key repeatedly to go to the
"Determining/ setting up the cell constant" function.
3 Press the <CAL> key repeatedly until the following is
displayed.