User guide

Operation handylab pH 12

ba75368e04 01/2011

4.2 Measuring

4.2.1 General information

You can measure the following variables:

z pH value

z ORP voltage

Preparatory

activities

Perform the following preparatory activities when you want to measure:

Caution

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.

Note

Incorrect calibration of pH electrodes leads to incorrect measured values.

Calibrate regularly before measuring.

Temperature

sensor

You can measure with or without a temperature sensor. If a temperature sen-

sor is connected, it is indicated on the display by TP.

Note

The measuring instrument automatically recognizes the type of the tempera-

ture 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>.