Xylem CG 843 - Manual (Page 20)

Operation
88
4.2 Measuring
Preparatory
activities
Perform the following preparatory 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.
Caution
When connecting an earthed PC/printer, measurements
cannot be performed in earthed media as incorrect values
would result.
The RS232 interface is not galvanically isolated.
1 Connect the 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 electrode
according to section 4.3 C ALIBRATING .
4 Select the measuring mode by pressing .