Operation Manual for - Mrclab.com

Ultrasonic milk analyzerreason it is always a good idea to have a back-up electrode on hand to avoidany system down time.3. Buffer SolutionsBuffers are solutions that have constant pH values and the ability to resistchanges in that pH level. They are used to calibrate pH measurementsystem.PH buffer solution description ( Pharmacopoeia standard)Use only this types standard buffers for calibration!Description pH 7.00±0,01/20ºC pH 4.00±0,01/20ºCCompositionPotassium dihydrogen Borax, Sodiumphosphate, Di-sodium hydroxide solutionhydrogen phosphateTemperatureparameters4. pH Electrode Calibration10ºC - 7.0625ºC - 6.9920ºC - 7.0030ºC - 6.9840ºC - 6.9550ºC - 6.9110ºC - 4.0025ºC - 4.0020ºC - 4.0030ºC - 4.0040ºC - 4.0050ºC - 4.05pH Electrodes are like batteries; they run down with time and use. As anelectrode ages, its glass changes resistance. For this reason, electrodesneed to be calibrated on a regular basis. Calibration in pH buffer solutioncorrects for this change.Calibration is an important part of electrode maintenance. This assures notonly that the electrode is behaving properly but that the system is operatingcorrectly.Usually pH meters require calibration at 3 specific pH values. One calibrationis usually performed at pH 7, second and third are typically performed at pH 4and pH 10.It is best to select a buffer as close as possible to the actual pH value of thesample to be measured. Use standard calibration buffers that thetemperature and the sample solution are the same.Use the operation manual for the corresponding pH meter.Operation manual 81/98