Metrohm 732 IC Detector User Manual
Page 96
4.4 Basic settings
732 IC Detector / 733 IC Separation Center
89
When the heating is switched on, the green display
lamp 77 "THERMOSTAT" is on. Thermostatting of the
conductivity detector is switched off by pressing the
"
off °C
"
,
at the same time the green display lamp 77 goes out.
Thermostatting functions only if the ambient tempera-
ture is at least 5 °C lower than the operating tempera-
ture.
>CONFIG/detector
‘zero’ unit:
µµS/cm
µ
S/cm, %fs, mV
Unit for display of the auto-zero value
The following units can be selected for the auto-zero
value displayed in the instrument standby mode (see
section 4.6.3):
µ
S/cm
Display in conductivity unit
µ
S/cm.
%fs
Display in % of the full-scale range which
has been set under the key
(see section 4.5.1) or
key (see section 4.5.2).
mV
Display in mV.
>CONFIG/detector
cell constant 16.7/cm
13.0
…
21.0 /cm
Cell constant of the conductivity cell
Setting of the cell constant of the measuring cell for
correct display of the absolute conductivity.
In ion chromatography, interest is normally centered
only on relative changes in the conductivity and not on
the absolute value. With the cell constant of 16.7/cm set
in the factory, the error in the display of the absolute
conductivity is ca.
±
10%.
If you wish to have a more accurate display of the ab-
solute conductivity, the cell constant must be deter-
mined by means of a calibration solution. To do this,
pump a solution of known conductivity through the IC
system, observe the display of the absolute conductivity
and change the cell constant until the displayed value
matches the actual value.
>CONFIG
>CONFIG/printer
Settings for external printer
>CONFIG/printer
id.1
18 ASCII characters
Identification 1 for 1
st
line of print header
Freely selectable ASCII character string for the first line
of the print header (text entry, section 4.2.5).