SCHOTT ProLab 4000, Operating Manual, Page: 70 / 228

pH ProLab 4000
70 ba75646e03 12/2012
7.2 Measuring the pH value
7.2.1 Preparatory activities
Perform the following preparatory activities when you want to measure:
Temperature sensor You can measure with or without a temperature sensor. The TP display
indicator appears when a temperature sensor is connected.
1 Adjust the temperature of the solutions and measure the cur-
rent temperature if the measurement is made without a temper-
ature sensor.
2 Connect a pH electrode to the meter.
3 Highlight the channel of the pH electrode in the measured
value display.
4 If necessary, select the pH display with <MODE> .
5 With manual temperature input:
– Call up the input window for the manual temperature input
with Measuring / Setting of man. temp... .
– Measure the temperature of the test sample using a ther-
mometer.
– Enter the measured temperature value and confirm it with
[OK] .
6 Calibrate the meter with the electrode.
Note
An incorrect calibration of pH electrodes leads to incorrect measured
values. Calibrate regularly. The meter has to be calibrated before
measuring.
Note
If using a pH electrode without temperature sensor, you can also use
the temperature sensor of another connected electrode or conductiv-
ity measuring cell (see page 62). In this case, the indication from
which channel the temperature value is taken appears next to the tem-
perature value.