Bluelab pH Controller Connect Manual - Manual (Page 10)

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10
14.0 pH calibration
pH calibration is important before fi rst use. It ensures pH measurements and/or
pH stock solution dosing is accurate. The Bluelab Temperature Probe DOES NOT
require calibration.
For accurate pH readings the pH probe is cleaned and recalibrated when:
• It has been 30 days since the last pH calibration, and the successful calibration
indicators are not showing.
• The reading is different to what you were expecting.
• The pH controller connect is reset to factory default.
• The pH probe is replaced with a new one.
If the pH probe has been in use it must be cleaned before pH calibration. See pH probe
cleaning in section 26.0. New pH probes do not need to be cleaned.
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 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 to pH 4.0 and/or pH 10.0.
• Place the temperature probe into the calibration solution with the pH probe during
calibration.
The pH calibration involves cleaning the pH probe tip and then calibrating in TWO or
THREE SOLUTIONS.
If you are calibrating to TWO solutions, remember:
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.
You would require calibration in THREE solutions if:
Readings above and below pH 7.0 are expected, use pH 7.0, pH 4.0 then pH 10.0
calibration solutions. You will need to enable 3 point calibration in the settings menu.
Follow the steps on the next page for pH calibration.
Storage and use of calibration solutions
• Always place the lid back onto the bottle after use or
evaporation will occur rendering the solution useless.
• DO NOT measure directly into the bottle. Tip a small
amount into a clean container and discard after use.
• Never add water to solutions.
• Store in a cool place.