A two-point calibration method Ph meter, electrode calibration (two-point calibration method) 1. Preparation ready cups of pure water each equipped with 250 ml (to ensure correction accuracy) beaker, and in which the first cup is poured into pH7 ph meter phosphate reagent mixing, pour a second cup pH4 potassium hydrogen phthalate reagent (or pH9 sodium tetraborate reagent depending on the user needs to be monitored, the general pH4 reagents), and stir with a stirring rod, it The third cup of pure water is completely dissolved as an electrode cleaning 2-point calibration correction step pH7:. Place the electrode in phosphate pH7 mixed solution, pH meter displays the value to be stable hold down the CAL / ENT key for three seconds. The display shows' correction, please wait ', while the display (5) starts flashing .14 seconds later, the screen flashes stop Huai'an ph meter, and displays' 6.86', at the same time, the display shows' pH7- Calibration complete 'At this point, PH7 calibration is complete Remove the electrode, placed in a beaker of pure water equipment to do the cleaning PH4 points or PH9 point correction:.. after cleaning the electrode into pH4 solution of potassium hydrogen phthalate, (or pH9 sodium tetraborate solution, depending on the user selection) to be displayed value stable pH meter. Press and hold the CAL / ENT key for three seconds, the display shows 'correction, please wait', while the display will begin to flash .14 seconds later, the display stops flashing and shows' 4.01 ', at the same time, the display shows' calibration is complete,' returned to normal after three seconds, the display (if the user selected pH9 sodium tetraborate Jiangsu ph meter, the display shows' 9.18 ') After termination board pt100 PT100 temperature probe, it automatically temperature compensated calibration is complete. If the user calibration, the display shows' sensor aging', it means that the electrode is aging, dashing contact me in order to replace the electrode . (or other failure of unknown origin) PH meter calibration 1, 20 to 30 minutes warm-up, in the measurement mode, press the "pH / mV" key to measuring the state raised "pH" of measurement. 2, the lower end of the pH electrode probe guard unplug and pull the rubber sleeve to expose the upper electrode so that the top of the hole, rinse the electrode with distilled water and filter paper or absorbent paper electrode (including the crystal ball) of water on the dry and put it into a mixed phosphate standard solution (PH 6.86) in. 3, with a thermometer to measure the temperature of the solution of the current standard, and set the same temperature on the instrument; Note: Set the temperature with the temperature selector button, press it upper "△" rose to adjust the temperature, press the lower button "▽" To adjust the temperature value drop, after adjusted to the same temperature, press the "OK" button. 4, shaking electrodes, so that the crystal ball and make full and uniform contact with the buffer solution. 5, to be displayed on the digital meter PH 20 ~ 30s continued unchanged, press the "locate" button, the instrument displays the word "Std yE5", press the "OK" button, the instrument automatically recognizes and displays the current temperature, PH value, then press "OK" button to complete the one-point calibration (with a slope of 100%), then the instrument displays the current solution PH value. 6. Rinse the electrode with distilled water and use the full paper or absorbent paper electrode (including the crystal ball) of water on the dry, add potassium hydrogen phthalate standard solution (PH 4.00) in. 7, with a thermometer to measure the temperature of the current standard solution Lake ph meter, and set the same temperature on the instrument; 8, to be displayed on the digital meter PH 20 ~ 30s continued unchanged, press the "slope" button, the instrument displays " Std yE5 "word, press the" OK "button, the instrument automatically recognizes and displays the current temperature, PH value, then press the" OK "button to complete the two-point calibration, then the instrument displays the current solution PH value Zhenjiang ph meter, ph meter Beihai 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!