Xylem WQ-FDO OPTICAL DISSOLVED OXYGEN TRANSMITTER - Manual (Page 6)

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III. Cleaning and Maintenance
Do not touch the sensor cap membrane with your fingers.
Avoid any mechanical stress such as shock or vibration.
Keep the outside of the sensor clean with tap water. Mild household
detergent can also be used. Avoid cleaning in the area around the
membrane. DO NOT use any cleaning products that contain alcohol. Use
only a lint free microfiber cloth when cleaning the cap and membrane.
Should dirt or other contaminants get on or under the cap, or if moisture gets
inside, the cap should be cleaned. Remove the sensor cap according to
Appendix A. Do not touch the membrane with your fingers and do not
allow the inside of the membrane to be exposed to any strong light source,
especially sunlight. Strong light can damage the membrane, remove the cap
in light protected environments only. Use only water and mild non-abrasive
detergents, do not use any cleaners containing alcohol. Clean the inside and
outside, pat dry all surfaces with a clean lint free microfiber cloth, then allow
to air dry completely. Make sure the o-ring is in place when replacing the
cap.
If the cap shows any visible damage it should be replaced.
This sensor is designed for measuring dissolved oxygen in water and other
mild solutions only. Measuring acids, bases or organic solvents can
considerably reduce the sensor’s lifetime or cause permanent damage. Long
term exposure to high temperatures may also damage it. These types of
damage are not covered under warrantee.