How to maintain the Kyushu Space Brand Acidity Meter

1.1 Incorrect operation of untrained personnel

The root cause lies in the fact that laboratory managers do not pay much attention to small measuring instruments such as acidity meters, mainly because they do not know enough about the accuracy of agronomic experiments, especially in student experiments. The most frequently heard sentence is “almost on the line”, indeed In some buffer systems, the pH positioning does not need to be accurate to two decimal places, but the most direct hazard brought by this habit is that the lack of attention to precision does not pay attention to the measuring instrument. Under this erroneous thought, it is often simple to explain a few sentences and then be handed over to the students. The misoperation caused by this kind of situation has a great influence on the experimental results. Even if it is corrected in time, it will often cause damage to the instrument during the misoperation. If the maintenance is not taken care of, the accuracy and life of the instrument will be reduced, such as stirring to calibrate the solution. Rude operation, stirring the solution too quickly may even cause the glass rod to break the electrode. In order to solve this problem, the user must be formally trained, especially the temperature, electrode maintenance, buffer maintenance and calibration fluid maintenance, which have a significant impact on the service life of the instrument, and a regular punishment system.

1.2 Many laboratories are not familiar with the principle and installation environment of the acidity meter.

Many students reflect the instability of the instrument during the use, pointers or numbers are beating. In addition to the problems of the instrument itself and temperature, it is necessary to check whether the acidity meter is properly grounded. The acidity meter is a kind of instrument with high input impedance. Its input impedance is above 11011Ω. Therefore, it is required that the instrument should have good grounding shielding when it is used. Otherwise, the pointer will be unstable or digitally beating, and the instrument will not stabilize.

1.3 did not pay attention to maintenance after use

In many students' experiments, due to the large number of experimental students and the number of groupings, the progress of the experimental steps between the groups is different, resulting in neglect or failing to close the acidity meter electrode, and the acidity meter electrode is exposed for a long time when the teacher ignores the student's forgetting. In the air, the acidity meter is dried, and it needs to be re-immersed and activated when it is used again, resulting in a decrease in the accuracy of the inconvenience of use, and the like. When the acidity meter is not in use, the correct maintenance method is to store the electrode in a saturated potassium chloride solution. At the same time, the fresh standard solution should be regularly configured to maintain the accuracy of the calibration.

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