(1) there should be no bubbles in the front of the bubble, if a bubble should be flung out.

(2) after the electrode is removed from the soaking bottle, it should be sloshing and drying in the deionized water, and do not wipe the bulb with paper towel. Otherwise, the electrostatic induction charge will transfer to the glass membrane and extend the potential stability time. The better way is to use the measured solution to rinse the electrode.

(3) after the pH composite electrode was inserted into the measured solution, the sloshing was stirred and placed at rest, which would accelerate the response of the electrode. Especially plastic pH composite electrode, stirring to shake some of the powerful, because there will be a small cavity between the bulb and the plastic shell, electrodes immersed in the solution after sometimes gas in the cavity to eliminate the bubbles, the bubble or the liquid junction with the solution of bad contact, and therefore must be stirred vigorously shaking to exclude bubbles.

(4) after testing in the sticky sample, the electrode must be repeated repeatedly with deionized water to remove the specimen adhered to the glass film. Sometimes it is necessary to wash the sample with other solvents, and then wash the solvent in water and soak in the soaking solution.

(5) avoid strong acid strong alkali or corrosive solution. If this solution is tested, the immersion time should be reduced as much as possible and carefully cleaned after use.

(6) avoid the use of dehydrated media, such as anhydrous ethanol and concentrated sulfuric acid, which can damage the hydration gel layer on the surface of the bulb.

(7) the shell material molded pH composite electrode is polycarbonate plastic (PC), PC plastic will dissolve in some solvents, such as carbon tetrachloride, three chloride, tetrahydrofuran, if the test contains more solvent, it will damage the electrode shell, you should switch to glass shell pH composite electrode.