10.0 calibration solution. Wait at least one minute for
reading to stabilise.
c)
Press and hold the pH cal button for a few seconds
until ‘PH’ and ‘CAL’ appear in the windows, then
release the pH cal button. The 4/10 LED will glow
green. All three windows will return to monitoring
mode with all current values being displayed.
d)
If ‘Err’ is displayed see the troubleshooting guide on
section 18.0.
e)
The Guardian Monitor Wi-Fi is now calibrated and
ready for use.
Successful pH 7 and pH 4
calibration
12.0 pH calibration cont.
The LEDs next to the pH window will let you know the status of calibration. See the table
below.
NOTE: The pH probe and hence calibration will eventually fail due to;
•
Contamination and age of pH probe.
•
pH probe used to measure solutions at temperatures above 50 °C (122 °F) or below
0 °C (32 °F).
•
pH probe exposed to aggressive chemicals.
•
Internal damage to the pH probe from rough treatment.
•
Damage to the cable of the pH probe from rough treatment.
•
pH probe repeatedly drying out.
•
Moisture getting inside the BNC connector on the pH probe cable.
Using factory default calibration values. Both LEDs off. Readings may be
unreliable.
pH 7 calibrated OK. Using factory default for pH 4/10. pH 7 calibrated OK. Using
factory default for pH 4/10. Readings may be unreliable.
pH 7 and pH 4 or pH 10 calibrated OK.
30 days passed since last full calibration - calibration due.
If 7 is flashing and 4/10 is off, calibration is also required as 4/10 was never
calibrated.
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