Although many types of pH meter, but the calibration methods are used in two-point calibration method, choose two standard buffer: one is pH7 standard buffer, and the second is the standard pH9 pH4 buffer or standard buffer. First with pH7 standard buffer for electricity meter to locate, and then choose the second criterion based on measured pH buffer solution. If the test solution is acidic industrial ph meter, the selection criteria pH4 buffer; if the test solution is alkaline, the selection of standard buffer pH9. If the manual adjustment of the pH meter, the operation should be repeated several times between the two standard buffer, until not need to adjust the zero point and orientation (slope) knob, pH meter can accurately show the two standard buffer pH. The calibration process is complete. Thereafter, during the measurement of zero and positioning knob should not move. If Smart pH meter, you do not need to repeatedly adjust, because it has been stored inside several standard buffer pH values ??to choose from, and can automatically identify and automatic calibration. But pay attention to the standard buffer selection and preparation of accuracy. Smart 0.01 pH meter generally three to five standard memory buffer pH, such as Dragon's Legislative Branch KL-016-type pH meter. Second, before calibration should pay particular attention to the temperature of the test solution. In order to select the correct standard buffer, and adjust the temperature compensation knob on the electric meter panel to match the temperature of the sample solution. Ph meter at different temperatures, the pH standard buffer solution is not the same. Calibration of the pH meter is calibrated using known pH value of the solution of the instrument to be tested. pH calibration is generally divided into two kinds: one is the other is a two-point calibration calibration. Which is used to calibrate the zero point calibration, calibrate for symmetry. In addition to calibration of the zero point calibration mode, but also to observe the slope is within a given range adjustment, if exceeded, the measure allowed, to be re-calibrated, repeat. In actual production calibration, often using two calibrated manner. Two calibration calibration solution using mainly three kinds: pH = 4.00, pH = 6.86 and pH = 9.18. In actual use, the use of ph meter, only need to take one of two kinds, but requires the first low-high, that is, when the first correction ph meter calibration principle solution at a low value, and then the solution was at a high value . To E + H's liquisysS CPM223 / 253, for example, at 6.86 and 9.18 in the calibration, connect the power transmission line after the end of the first clean 6.86 pH probe into the solution, and enter a value in the calibration solution calibration function menu, Press CAL start calibration, the instrument displays the measured value at this time, when a stable pH range within ± 0.05 over 10s, a little calibration is complete. Rinse after the probe into the solution, 9.18, 6.86 calibrated the same way, when a stable pH range within ± 0.05 over 10s two-point calibration is completed. Check the slope and zero point display shows that when both are within the set range, the calibration is successful, can be put into use, otherwise the two-point calibration should be repeated until the check slope and zero display show both parties within the set range successfully in short, pH calibration is a repetitive work, each manufacturer calibration menu may be different, but the principles and methods are the same, as long as the standard solution is accurate, step right, will be able to calibrate successfully. ph meter works, Baicheng Technology (certified), Korla City, ph hundred dollars provided by Changzhou Technology Limited. Changzhou one hundred Technology Limited (www.czbckj.com) Jiangsu Changzhou, chemical instrumentation leader, over the years, the company is implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer needs. In one hundred as a technological leader with the staff warmly welcome all inquiries negotiations to create one hundred to a better future technology.