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Give an example: METTLER TOLEDO oxygen electrodes undergo a series of inspections before leaving the factory. The electrode itself has an electrode membrane. However, since a certain period of time is required during the purchase and transportation process, it is best to replace the electrolyte before use. If errors occur in the electrode signal (long response time, mechanical damage, increased current in oxygen-free media, etc.), the membrane needs to be replaced. Maintenance work of replacing electrolyte should be carried out every three months: 1. Place the electrode in a vertical position and unscrew the old electrode membrane. 2. Rinse the inner electrode body with water and carefully dry it with tissue paper. Check whether there is electrolyte between the inner electrode body and the stainless steel shell. If there is residual electrolyte, gently shake it clean. 3. After using for a period of time, if the silver ring of the electrode body is found to be black, you can polish it with fine sandpaper of more than 1000 mesh. 4. Check whether the O-ring (203021167, 202031000) and spring (002011055) are mechanically damaged and replace them if necessary. 5. Pour the electrolyte into the membrane to be replaced, and control the liquid level below the thread. Appropriately adding more electrolyte can avoid affecting the electrode polarization due to less electrolyte. Place the electrode in a vertical position and gently screw the membrane onto the electrode body. When twisting the electrode membrane, pay attention to "advance two and retreat one" to avoid breaking the membrane due to the inability of excess liquid in the membrane to be discharged in time. Finally, the electrode membrane should be tightened until no O-ring color (black) is exposed. Wipe the leaked electrolyte with tissue paper. 6. Due to the sealing effect of the O-ring, the membrane will be tightened easily. If you need to tighten it forcefully or the process cannot be completed easily. It may not be screwed in the correct position. 7. After each membrane change or electrolyte change, the electrode must be repolarized and calibrated. 8. Polarization: After replacing the new electrolyte or replacing the membrane, power must be continuously supplied for more than 7 hours, which is considered polarization. Accurate calibration is only possible after polarization. Polarize first, calibrate later. 9. Calibration: Place the polarized electrode in the air, press CAL, enter 1147, and enter Automation Air. Air calibration submenu, press enter continuously to perform automatic calibration. Zero point does not require verification. Slope is generally between -350±100. 10. The probe is placed in the air and displays 100k?