Xylem CG 842 - Manual (Page 21)

Operation
64
4.2 Measuring
Preparatory
activities
Perform the following activities when you want to measure:
Note
Incorrect calibration of the pH electrode will result in incor-
rect measured values. Therefore, regularly perform calibra-
tion before measuring.
Temperature probe Measurements can be performed with and without a temper-
ature probe. A connected temperature probe is indicated by
TP on the display.
Note
The pH meter automatically recognizes the type of the tem-
perature probe used. As a result, you can connect elec-
trodes with the NTC 30 or Pt1000.
The temperature measurement is absolutely essential for a
reproducible pH measurement. If the measurement is made
without a temperature probe, proceed as follows:
Note
When calibrating without a temperature probe, set up the
current temperature of the respective buffer solution manu-
ally by pressing the <
▲ > < ▼ > keys.
1 Connect the pH electrode to the instrument.
2 Adjust the temperature of the buffer or test solutions
or measure the current temperature if the measure-
ment is made without a temperature probe.
3 Calibrate or check the instrument with the pH elec-
trode according to section 4.3.
4 Select the measuring mode by pressing .
1 Determine the current temperature using a thermo-
meter.
2 Set up the temperature by pressing < ▲ > < ▼ >.