Bluelab Soil pH Pen - Manual (Page 12)

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12
12.0 Error messages
The following error messages appear for the following reasons.
11.0 Calibration
pH calibration is required before fi rst use to ensure that the fi rst reading is
accurate. Calibration is also required when:
• The check mark/tick has disappeared from the LCD screen
(30 days after last successful calibration)
• The reading is different from what you expected
• After cleaning
• After changing the battery
pH 7.0 and pH 4.0 solutions are required for calibration and should be decantered into
small, clean plastic containers. 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 fi rst use, YOU MUST CLEAN the probe tip
before calibrating.
See section 9.0 Cleaning.
Remove storage cap/dibber.
Refer to section 2.0, step 1.
Rinse probe tip in fresh water and place in pH 7.0 solution.
Wait for reading to stabilize to a constant value.
Press the cal button until CAL is displayed.
Release button. When CAL 7 is displayed, 1 point calibration
is achieved.
Rinse probe in fresh water and place it in either pH 4.0
or pH 10.0 solution (use pH 10.0 solution if you expect to
measure above 7.0 pH).
Wait for reading to stabilize to a constant value.
Press the cal button until CAL 4 or CAL 10 is displayed.
CAL 4 or CAL 10 should be displayed (depending on what
solution you are calibrating in). The check mark/tick is
displayed when a 2 point (or 3) calibration is completed.
NOTE: For a three point calibration repeat steps 2, 3 & 4
using pH 7.0, 4.0 then 10.0 solution.
Temperature
over range
pH calibration
failed
pH over range
Hardware error
pH under range
Temperature
under range
1
2
3
4
5
6
pH 7.0
pH 4.0
or
pH 10.0