How to install YOKOGAWA DO30G dissolved oxygen sensor?

Check the condition of the permeable membrane: visually inspect the membrane for any damage, wrinkles, or severe contamination (such as oil stains or sediment). If there is, replace the membrane module (model K9171HM)+electrolyte; If the pollution is minor, clean with clean water and neutral detergent and try again;

Check the locking nut of the membrane module: confirm whether the locking nut is loose (looseness can cause electrolyte leakage, and the measured value is low). If it is loose, tighten it. If it is still abnormal after tightening, replace the electrolyte;

Check the status of the electrolyte: observe whether the electrolyte is turbid or discolored (normally clear), and replace it if it deteriorates;

Check temperature compensation: Use a multimeter to measure the resistance between terminals 11-12 of the cable (standard value of 1097 Ω at 25 ℃). If the resistance is abnormal, the sensor RTD is faulty and needs to be replaced;

Check the lead electrode: If the above steps are ineffective, it may be due to long-term corrosion failure of the lead electrode (with a lifespan of 3-4 years), and the sensor needs to be replaced as a whole.