Measuring - wtw pH 3150i Operating Manual

Operation
Preparatory activities
Temperature sensor
14
4.2

Measuring

Perform the following preparatory activities when you want to measure:
1 Connect the electrode to the measuring instrument.
2 Calibrate or check the measuring instrument with the elec-
trode.
3 Select the measuring mode with <M>.
Note
Incorrect calibration of pH electrodes leads to incorrect measured val-
ues. Calibrate regularly before measuring.
Basically, pH measurements should only be performed using a temper-
ature probe. The temperature probe is shown on the display by TP.
If you nevertheless use an electrode without a temperature probe, the
instrument operates with a reference temperature of 25 °C. Thus, the
sample and calibration solution must have their temperatures adjusted
to 25 °C in order to avoid larger measurement errors.
Note
The pH meter automatically recognizes the type of temperature probe
used. This enables electrodes to be connected with the NTC30 or
Pt1000.
pH 3150i