Operation
ProLab 2000
48
ba75577e03
11/2009
4.5.7
Calibrating
Make sure the
Buffer
setting is correctly set in the sensor menu (see
Use any one to five buffer solutions of the selected buffer set in
ascending or descending order.
The
NIST/DIN
calibration is described below. With other buffer sets,
other nominal buffer values are displayed. Apart from that, the
procedure is identical.
1
Press
<
▲
><
▼
>
<MODE>
to select the measured parameter pH
or mV in the measured value display.
2
Start the calibration with
<CAL>
.
The calibration display appears.
3
Immerse the electrode in buffer solution 1.
4
If the
Set temperature
menu item appears, measure and enter
the temperature of the buffer manually (measurement without
temperature sensor).
5
Select
Continue
with
<
▲
><
▼
> and press
<MENU/OK>
. The
buffer is measured.
The measured value is checked for stability (Stability control).
i
Buffer series
NIST/DIN
i
Immerse sensor in buffer 1
Continue
pH <CAL>
i
Buffer value =
6.865
i
U = 3.0 mV
i
Temperature =
24.8 °C
Terminate stability control
Recognized nominal buffer
value (referring to 25 °C)
Current electrode voltage
Current temperature value
pH <CAL>