Calibrating the pH electrode
The optional pH electrode you are using must be calibrated before making pH measurements
with it for the first time. The electrode also should be calibrated whenever you wish to maximize
the accuracy of measurements. Calibration is necessary because not every pH electrode is an
“ideal” electrode that generates 0 mV at pH 7 and 177.4 mV at pH 4.
1.
To calibrate the pH electrode
, perform the following procedure while referring to
Figure 2.
2. Calibrating a pH electrode using the buffer solution
2-1 Electrode plug
2-2 Electrode handle
2-3 Electrode head
2-4 pH buffer solution
1.
Insert the plug of the pH electrode
into the BNC socket at the top of the meter (callout
1-14 of Fig. 1).
2.
Power on the meter
by pressing the POWER button.
3.
Using the procedure detailed earlier,
manually adjust the compensation temperature
so it matches the temperature of the buffer solution. Alternatively, use an ATC
temperature probe to make the adjustment automatically.
4.
Holding it by its handle,
immerse the pH electrode
in the bottle of buffer solution. (If
you are using the ATC temperature probe, immerse its head in the bottle as well.)
5.
Gently shake the electrode
(and the probe, if used). The display will show the pH value.
6.
Use two fingers to press the REC/ENTER and HOLD/ESC buttons
at the same time.
When this screen
appears, release the buttons.
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