User Manual

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6
7.0 Calibration
pH calibration is required before rst use to ensure that the rst reading is
accurate. Calibration is also required when:
• The check mark/tick has disappeared from the LCD screen (30 days after last
calibration)
• The reading is different from what you expected
• After cleaning and hydration
• After changing the batteries
pH 7.0 and pH 4.0 solutions are required for calibration. You may also calibrate using pH 7.0 and
pH 10.0 solutions if your readings will normally be higher than 7.0 pH.
Excluding rst use, clean pH Pen probe with Bluelab pH Probe
Cleaner and rinse well (see section 4.0).
Press “power/hold” button to turn on.
Place probe tip in fresh Bluelab pH 7.0 Calibration Solution.
Always 7 rst!
Long press “cal” button until “CAL” is displayed. Release button.
‘
 ’ starts to ash indicating the start of calibration. Leave the
probe in the solution while the display is ashing. After ‘
    ’
stops ashing, ‘CAL’ shows the calibration point is complete.
Rinse probe tip in clean tap water and then gently shake off any
excess water.
Place probe tip in fresh Bluelab pH 4.0 or pH 10 calibration solution.
Long press “cal” button until “CAL” is displayed. Release button.
‘
 ’ starts to ash indicating the start of calibration. Leave the
probe in the solution while the display is ashing. After ‘
    ’
stops ashing, ‘CAL’ shows the calibration point is complete.
A check mark will be displayed at the bottom of the screen to
indicate a successful calibration. It will disappear after 30 days to
indicate calibration is required.
The Bluelab pH Pen should always be calibrated to 2 points! Always
calibrate to pH 7 rst, then pH 4 or 10.
NOTE: The pH Pen will not hold calibration if it is only calibrated to
pH 7.0. Calibration to pH 7.0 and pH 4.0 is required.
6.0 Hydration
Hydrate the pH pen tip in Bluelab pH Probe KCl Storage Solution before rst
use and after cleaning to improve the reading response speed.
Never use RO, Deionized or Distilled water. Pure water changes the ions, causing the probe to die.
Remove the storage cap.
Place the pH pen upright in a small plastic container.
Add enough Bluelab pH Probe KCl Storage Solution to
submerge the probe tip.
Leave to soak for at least 24 hours.
After hydration, always rinse the probe tip in fresh water, then
calibrate the pH pen to ensure accuracy. See section 7.0.
1
2
3
1
2
3
4
5
6
7
pH 4.0
or
pH 10.0
KCl
Storage
Solution
pH 7.0