9
The meter reaches endpoint according to the endpoint mode, the calibration point pH value
(e.g. 4.01) with the temperature display on the screen.
The 2-point calibration is finished, now we have 3 choices to do next:
Press button-
Cal
to do the 3-point calibration.
Press button-
Read
to store the 2-point calibration and exit, the
offset
and
slope
are shown
on the display for 3 seconds then return to the measurement screen.
Press button-
Exit
to reject the calibration, return to the measurement screen.
Note:
The use of a temperature electrode or an electrode with a built-in temperature sensor (3-in-
1 pH electrode) is recommended. If you use the
MTC
mode, you should enter the correct
temperature value and keep all buffer and sample solutions at the set temperature. (See 4.2)
3.2
Sample measurement
3.2.1
pH measurement
Place the pH electrode in the sample.
Press button-
Read
to start the pH measurement, appears on the display. is blinking
during measurement.
When meter reaches endpoint, the pH value with the temperature display on the screen.
3.2.2
mV measurement
Press button-
Mode
to switch between
pH measurement mode
and
mV measurement
mode
.
Follow the same procedure as for pH measurement to perform mV measurement.
3.3
Temperature measurement
For better accuracy, we recommend to use either a built-in or a separate temperature electrode.
If a temperature electrode is used,
ATC
and the sample temperature are displayed.
If the meter does not detect a temperature electrode, it automatically switches to the manual
temperature compensation mode and
MTC
appears. MTC temperature should be set.
Note:
STARTER 3100
accepts
NTC 30 kΩ
temperature sensor. ATC (Auto Temperature
Compensation) or MTC (Manual Temperature Compensation) , the Temperature Compensation
only corrects for the change in the output of the electrode, not for the change in the actual solution.
That means the meter corrects the signal(mV) from the pH electrodes to get a more accuracy pH
value according to the real temperature.
