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METTLER TOLEDO oxygen electrodes undergo a series of tests before leaving the factory, and the electrodes themselves are equipped with an electrode membrane. However, since a certain period of time is required for the purchase and transportation process, it is best to replace the electrolyte before use. If errors occur in the electrode signals (long response time, mechanical damage, increased current in an oxygen-free medium, etc.), the membrane needs to be replaced. The maintenance task of replacing the electrolyte is carried out every three months: 1. Place the electrodes in a vertical position and remove the old electrode membrane. 2. Rinse the inner electrode body with water and carefully dry it with cotton paper. Check whether there is any electrolyte between the inner electrode body and the stainless steel casing; if any residual electrolyte is present, shake it off gently. 3. After using it for a while, if the silver ring of the electrode body turns black, it can be polished with fine sandpaper with a grit size of 1000 or higher. 4. Check whether the O-rings (203021167, 202031000) and spring (002011055) are mechanically damaged; replace them if necessary. 5. Pour the electrolyte into the membrane to be replaced, keeping the liquid level below the threads. Adding an appropriate amount more electrolyte can prevent electrode polarization caused by a low level of electrolyte. Place the electrode in a vertical position and gently screw the membrane onto the electrode body. When screwing on the membrane, follow the principle of \"two turns forward and one turn backward\" to prevent the membrane from being torn due to excess liquid inside that cannot be drained promptly. Finally, the membrane should be tightened until no color of the O-ring (black) is visible; any leaked electrolyte should be wiped dry with cotton paper. 6. Due to the sealing effect of the O-ring, the membrane can be tightened easily; however, forceful tightening may be required if this process cannot be completed easily. Then it may not be screwed in the correct position. 7. After each membrane or electrolyte replacement, the electrode must be repolarized and calibrated. 8. Polarization: After replacing the electrolyte or the membrane, it is necessary to apply electricity continuously for more than 7 hours; this is known as polarization. Accurate calibration can only be performed after polarization. Polarize first, then calibrate. 9. Calibration: Place the polarized electrode in the air, press CAL, enter 1147, and go to Automation Air. Air calibration submenu: press Enter repeatedly to perform automatic calibration. Zero point does not require calibration. The slope is generally between -350±100. 10. When the probe is placed in air, it shows 100kΩ