3.0 Calibration
pH calibration is required before fi rst use and then monthly to ensure readings are
accurate.
To calibrate the probe to the pH instrument:
Clean pH probe tip.
See section 4.0 (the pH probe does not require cleaning before the fi rst use).
Calibrate the pH.
This must be done before the pH probe is used for the fi rst time. Follow the calibration
instructions on the back of the meter, in the manual or watch our videos online.
For accurate pH readings the pH probe is cleaned and recalibrated when:
• The reading is different to what you were expecting.
• The batteries have been removed or changed.
• The pH probe is replaced with a new one or is disconnected from the meter.
• The pH calibration indicators have disappeared.
When calibrating the pH after fi rst use the pH probe needs to be cleaned. See pH probe
cleaning in section 4.0. The pH probe does not need to be cleaned prior to initial calibration.
For best pH calibration
pH reading accuracy is dependant on the accuracy and age of the calibration
solutions used, and use and cleanliness of the pH probe tip.
• Ensure the pH probe has been cleaned and rinse the pH probe tip with clean water
between calibration solutions to reduce contamination of the pH solutions.
• Only fresh uncontaminated solutions should be used.
• Calibrate the pH at the same temperature as the solution to be measured.
• ALWAYS calibrate the pH probe with pH 7.0 then pH 4.0 or pH 10.0.
The pH calibration involves cleaning the pH probe tip and then calibrating in
TWO SOLUTIONS.
If a reading below pH 7.0 is expected, use pH 7.0 and pH 4.0 calibration solutions.
If a reading above pH 7.0 is expected, use pH 7.0 and pH 10.0 calibration solutions.
Storage and use of calibration solutions
• Always place the lid back onto the bottle after use or evaporation will occur rendering
the solution useless.
• Store in a cool place.
• DO NOT measure directly into the bottle. Tip a small
amount into a clean container and discard after use.
• Never add water to solutions.
pH reading accuracy is dependant on the accuracy
and age of the calibration solutions used, and
use and cleanliness of the pH probe tip.
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