In-Situ RDO PRO-X Process Optical Dissolved Oxygen Sensor Manual - Manual (Page 13)

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3. Pull the used RDO cap off of the sensor, without twisting.
4. Remove the existing O-rings from the sensor.
Ensure that there is no moisture in the O-ring grooves. Do not
touch or clean the lens with anything other than the supplied lens
wipe.
5. Use your finger to apply a very light layer of silicone-based lubricant around the O-
ring grooves.
6. Place the O-rings on the sensor. Apply another thin layer of lubricant to the O-rings
and grooves.
Note: Do not transfer grease to the lens or sensor pins.
7. Clean the sensor lens with the wipe provided in the kit and allow it to thoroughly dry.
Inspect for scratches or dirt.
8. Remove the new cap from its sealed packaging and attach it to the sensor, being
careful to press firmly, without twisting, until it seals over the lens. Make sure that the
O-rings are not pinched or rolled between the cap and sensor.
9. Replace the nose cone.
10. Perform a 1- or 2-point calibration.
Maintain Desiccant
Desiccant installed in a controller or transceiver protects probe electronics from
condensation. A desiccant pack changes color from blue to pink as it becomes
saturated with moisture.
It is extremely important to use the proper size desiccant for your
deployment and to change desiccant often. Desiccant should be
changed before the entire pack has turned pink, and you should
use enough to effectively keep cables and probes dry until your
next scheduled maintenance. Desiccant lifespan is dependent on
site conditions.