2
Set-up
1. Select [SETTINGS] by pressing
MENU (F2)
.
2. Follow the instructions on the screen to adjust language, contrast and automatic power-off timer or to
erase the memory. Press
OK or SELECT (F2)
to confirm or
CANCEL (F1)
to exit.
Measurement
1. Connect the electrodes to the corresponding BNC inputs. Automatic temperature compensation and
temperature measurements are possible with a Pt1000 temperature probe.
2. Press MENU (F2), select the desired mode with
and press
OK or SELECT (F2)
.
Never immerse a pH electrode and a dissolved oxygen electrode together in the same solution!
A blinking decimal point warns you for unstable measurements. Wait to read the display! Stirring the solution
during the measurements promotes the homogeneity and is obligatory!
Calibration
Press
CALIBRATE (F1)
to go to the calibration menu
The instrument will refuse automatic calibration when the electrode is unstable. Insufficient stirring or a worn
electrode may be the cause.
pH
1. The instrument permits to choose between the buffers in memory (1.68, 2.00, 4.00, 4.01, 6.87, 7.00,
9.18, 9.21, 9.95, 10.01, 12.00, 12.45). Select the proper values and press
OK.
2. Rinse the electrodes with distilled water and immerse them in the first buffer solution. Select
[CALIBRATE], press
OK or or SELECT (F2)
and follow the instructions on the screen until the
calibration is finished.
3. After rinsing the electrodes with distilled water, immerse them in the samples and read the display.
4. Rinse the electrodes always with distilled water after use and store them in a 3...4 M KCl solution.
mV
1. Immerse the electrodes in a standard solution of known potential. Select [CALIBRATE] and press
OK or
SELECT (F2)
. Adjust to the proper value and press
OK or SELECT (F2)
.
•
Select [RESET] and press OK or SELECT (F2) to reset the calibration.
Temperature
1. Immerse the Pt1000 in a solution of known temperature. Adjust to the proper value and press
OK
.
•
Select [RESET] and press OK to reset the calibration.
•
Without Pt1000, press OK, adjust the manual temperature compensation and proceed by pressing OK.
Conductivity
1. The instrument permits to choose between the standards in memory (0.01, 0.1, 1 M KCl). Select the
proper values and press
OK or SELECT (F2)
2. After rinsing the electrode several times with the first standard solution, immerse it in that standard. The
solution temperature is not so critical but should lie between 0°C and 40°C. When no Pt1000 is used, do
not forget to compensate manually first! Select [CALIBRATE], press
OK or SELECT (F2)
and follow the
instructions on the screen until the calibration is finished.
3. Rinse the electrode several times with the sample, immerse it in that solution and read the display.
4. Rinse the electrode always after use and store it in distilled water.
Dissolved oxygen
1. The display shows the air pressure correction and the salinity correction. Select the proper values and
press
OK or SELECT (F2)
. Leave salinity correction to zero unless you are going to measure in heavily
salted solutions such as e.g. sea-water (35 g/l). Select [CALIBRATE], press
OK or SELECT (F2)
and
follow the instructions on the screen until the calibration is finished.
