Operation pH 330i/340i
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4.2 Measuring
4.2.1 General information
You can measure the following variables:
l pH value
l ORP voltage
Preparatory activities Perform the following preparatory activities when you want to measure:
Warning
When connecting an earthed PC/printer, measurements cannot be per-
formed in earthed media as incorrect values would result. The RS 232
interface is not galvanically isolated.
Note
Incorrect calibration of pH electrodes leads to incorrect measured val-
ues. Calibrate regularly before measuring.
Temperature sensor You can measure with or without a temperature sensor. If a tempera-
ture sensor is connected, it is indicated on the display by TP.
Note
The measuring instrument automatically recognizes the type of the
temperature sensor used. Therefore, you can connect temperature
sensors of the NTC30 or Pt1000 type.
1 Connect the electrode to the measuring instrument.
2 Adjust the temperature of the buffer solutions or test solutions,
or measure the current temperature, if you measure without a
temperature sensor.
3 In conjunction with the electrode, check or calibrate the mea-
suring instument. How to calibrate is described in section 4.3.
4 Select the measuring mode with <M>.
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