Xylem handylab pH LF 12 - Manual (Page 18)

Operation handylab pH/LF 12
18 ba75370e03 11/2009
4.2 pH value / ORP voltage
4.2.1 General information
Preparatory
activities
Perform the following preparatory activities when you want to measure:
Note
Incorrect calibration of pH electrodes leads to incorrect measured values.
Calibrate regularly before measuring. You can only connect electrodes of the
NTC30 type or without temperature probe.
Warning
When connecting an earthed PC/printer, measurements cannot be per-
formed in earthed media as incorrect values would result. The RS232 inter-
face is not galvanically isolated.
1 Connect the pH electrode to the measuring instrument.
If necessary, press the <M> key repeatedly until the status dis-
play pH (pH measurement) or U (measurement of the ORP
voltage) appears.
2 Adjust the temperature of the buffer solutions or test solutions,
or measure the current temperature, if you measure without a
temperature probe.
3 Calibrate or check the measuring instrument with the elec-
trode.
4 Using <
▲ > <▼>, toggle between the pH or mV measuring
modes.