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| Frequently Asked Questions About pH Probes |
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| What Are The Crystals On The Probe? During storage, salt crystals will often form on the electrode, around the soaker bottle. Sometimes the formation is so extensive there will be crystals under the soaker bottle and on the foam inside the box. This will not affect the performance, accuracy or life of the probe. Rinse off the crystals with water prior to use. How Should Electrodes Be Stored? Never store a pH electrode dry. The first choice for storing Electrodes is KCl solution. We recommend any concentration between 2.0 M and 3.8 M. Another good choice is buffer solution. A pH 4 buffer solution is best since it will keep longer, but pH 7 is also acceptable. If it is necessary to clean a Electrodes with acid, caustic, solvent or other cleaning solution, it is best to soak the electrode in KCl solution after cleaning and prior to use or calibration. This will re-condition the bulb and reference, extending the probe life and improving calibration accuracy. What Are The Three Most Important Things To Remember During Calibration? 1) Always use fresh buffer. The pH of buffers will change quickly due to air, dilution and carry-over. 2) After rinsing a pH electrode between buffers, blot the electrode dry, do not wipe it. Rubbing the electrode can build up a static charge, just like rubbing your feet on the carpet. This charge can prevent proper calibration. (If this happens, wait and let the electrode stand in solution so the charge can dissipate.) 3) Always consider the effects of temperature on the measurements. Many pH measurements are temperature dependent. Please call us for a copy of our newsletter on temperature compensation and pH measurements. How do I acheive more accurate pH measurement? To yield the most accurate pH measurement, it is important to compensate for temperature. Temperature has two significant effects on pH readings. The solution pH and the electrode output will both change at different temperatures. These two effects, either together or separately, can lead to errors in calibration, measurement and control. |
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