9. The sample temperature is 10 ℃, at this time the meter displays the pH value is what temperature? If you require a pH value of 25 ℃, and in what ways? Explanation: The acidity of pH meter displays the current temperature. If you need to get pH PH meter principle 25 ℃, the temperature of the solution must liters / dropped 25 ℃, then measured. PH meter instrument can compensate for the effects of temperature on the pH electrode does not compensate for the effects of temperature on the sample. 10. Why the value of the same sample, the two measurements are not the same reasons: (1) temperature change or chemical change in the sample itself (2) a longer time interval between two measurements, the electrode status changes (3) the sample is a low ionic strength, did not choose the correct electrode to correct: (1) maintain the same temperature; avoid chemical changes. (2) re-calibration after measuring electrode. (3) use LE420 / Inlab420 electrode. 11. Why did the same sample, while the two measuring pH meter reading is not the same reason: to correct calibration conditions are not the same: with the same buffer at the same time on the pH meter calibration, then the simultaneous determination! 12. The electrode calibration time how long? PH meter calibration frequency electrode maintenance methods, depending on the use, maintenance, sample characteristics, and measurement accuracy. Calibrated at least once a week. If you use a PH meter Changzhou companies offer daily recommended calibration once a day. However, long-term replacement of electrodes or unused, must be calibrated before use pH meter electrode current classification, pH meter measuring electrode industry is generally divided antimony electrode and a glass electrode. Reference electrode commonly used stable performance, rugged solid electrode or calomel electrode. With the development of the production process, most industrial pH meter into the measuring electrode and the reference electrode are assembled together to form a composite electrode, the electrode is more compact, easy to install. Antimony electrode Antimony electrodes are original electrode made of pure antimony spectrum. This is a metal - metal oxide electrode. Its electrode potential generated in the interface with the oxide of the metal on the surface thereof covered. This electrode structure is simple, can be used to measure the liquid does not contain oxidizing medium, semi-solid, gum, and the pH of the water and oil mixture. It can be used at higher temperatures, the measurement accuracy of ± 0.2pH. Antimony electrode itself redox reaction as follows:? Sb2O3 (surface) + 6H + + 6e 2Sb (body) + 3H2O The electrode PH meter advantage of simple structure, fast response, the case of no cyanide poisoning, antimony cleaned electrode surface by mechanical scraping chip, a good cleaning effect. The disadvantage is low precision, vulnerable oxalates, phosphates damage partial use of PH meter, PH meter, one hundred to one hundred technology provided by Changzhou Technology Limited. Changzhou Best Technology Limited (www.czbckj.com) strong, credible, in Changzhou, Jiangsu chemical instrumentation industry has accumulated a large number of loyal customers. The company better work attitude and continuous improvement will lead one hundred innovative ideas into technology and you hand into the brilliant, for a better future!