The fundamental use of calibration and cleaning solutions is to correctly maintain electrode operation to assure accurate and reproducible readings. The most common cause for pH measurement inaccuracies is an unclean or improperly cleaned electrode. This is very important to note, because during calibration, the instrument assumes that the electrode is clean and that the standardization curve created during the calibration process will remain a valid reference until the next calibration. pH meters on the market today will allow an offset voltage of approximately ±60 mV. The deviation from 0 mV is not unusual but ideally should be no greater than ±30 mV. The calibration process compensates for the change in offset voltage.
Electrodes can become dirty from use and will produce inaccurate results even as they read correctly in a pH buffer. Hanna’s cleaning solutions eliminate impurities and residues that are left on electrode surfaces when immersed in samples during measurement and stored incorrectly. Hanna suggests cleaning the bulb and junction of your electrode on a regular basis to ensure that the probe is always clean and prevent any clogging of the junction.
Hanna offers a wide variety of cleaning solution from general purpose, protein cleaning, inorganics, and oil and grease to ones that are intended for specific applications such as wine, dairy and soil to name just a few.
Hanna cleaning solutions:
- Have the production batch number and expiration date on the packaging.
- Are in a air-tight bottle with tamper-proof seal of freshness to ensure quality.
- Are available in single use sachets or FDA complaint bottles.