User manual

2 Press OK to access the settings menu. The current setting is
displayed. Press OK.
3 Set the desired full range value. Press OK to acknowledge.
4 Turn the dial clockwise to access the settings menu. The current
setting is displayed. Press OK.
5 Set the desired zero level value. Press OK to acknowledge. Press
ESC twice to return to menu Set Parameters.
The module has an automatic over-range
function. If the monitor signal reaches
the full range value during a peak, the
signal will drop instantly to 0 V and give
an accurate display of the peak starting
from this position.
3.9 Calibrating conductivity
The cell constant for the particular flow cell is written on the flow
cell packaging. Refer to section B.2 in Reference information for
how to enter the cell constant.
Adjustment of the cell constant is only necessary when the monitor
is to be used to determine conductivity with high accuracy. The
procedure is described in Reference information section B.2.
Calibration can also be performed from UNICORN.
Select
System Control:System:Calibrate.
3.10 Calibrating the pH electrode
A good laboratory routine is to calibrate the module once a day,
when the electrode is replaced and if the ambient temperature
changes. The pH electrode is calibrated using standard buffer
solutions in a two point calibration. The two buffer solutions can
have any pH value as long as the difference between them is at least
1 pH unit. Calibration can also be performed from UNICORN. In
UNICORN, select System Control:System:Calibrate. Select the pH
monitor. The calibration procedure can be done with the pH
electrode either fitted in or removed from the flow cell.
Range
AU
Over-range
Measured absorbance
level (A U)
1 V
Signal to
recorder (V)
0 V
Set UV Zero Level
Set UV Zero Level
Set UV Range
Set UV Range
Monitor UPC-900
User Manual 18-1125-55 Edition AE
16
3 Operation