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3.7.2 Calibration with Automatic Temperature Compensation
To exit the calibration sequence at any time press the ESC key. This will cancel the pH calibration
and return the instrument to the MODE menu.
Note: Buffer solutions should be carefully prepared as per the manufacturers instructions.
1. Select the pH measuring mode using the Up/Down arrows which toggle between pH and mV
modes. Press the CAL key.
The primary display will show the current pH reading. The main display annunciators will indicate
CAL 1 and the buffer type being used.
The secondary display will show the ATC temperature in °C or °F.
The status display will indicate the Eo or slope values.
2. CAL 1 Immerse the electrode(s) in the first buffer solution and allow the instrument to stabilise.
When no change in the least significant display digit is detected over a five second period the
endpoint symbol will be displayed. Press the CAL or STO key.
If a successful I point calibration has been performed the secondary display will momentarily show
CAL OK. The instrument will then update the display. The display will then show the next part of the
calibration sequence if a 2 and 3 point calibration has been selected. If a 1 point calibration only is
required the instrument will display the Eo value on the status screen and then return to the main
measuring screen.
Rinse the electrode(s) in deionised water.
3. CAL 2 Immerse the electrode(s) in the second buffer solution and allow the instrument to stabilise. When no change in the least significant display digit is detected over a five second period the
endpoint symbol will be displayed. Press the CAL or STO key.
If a successful calibration has been performed the secondary display will momentarily
show CAL OK. The instrument will then update the display. The display will then show
the next part of the calibration sequence if a 3 point calibration has been selected. If a 2
point calibration only is required the instrument will return to the main measuring screen.
Rinse the electrode(s) in deionised water.
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