In-Situ RDO PRO-X Process Optical Dissolved Oxygen Sensor Manual - Manual (Page 8)

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1 Alignment arrow on cap
2 Cap installed over lens
3 Nose cone
Do not allow moisture or atmospheric humidity inside the cap.
Keep the cap in its sealed package until you are ready to install it.
Install promptly. Ensure that O-ring grooves are dry and that the O-
ring is not rolled or pinched inside the cap.
The typical cap lifetime is two years after the first reading has
been taken.
5. Reattach the nose cone.