In-Situ RDO PRO Process Optical Dissolved Oxygen Sensor Manual - Manual (Page 9)

4.0 Care and Maintenance
4.1 Clean the RDO Cap
1. The cap and nose cone must remain on the probe.
2. Rinse the sensor with clean water from a squirt bottle or spray bottle.
3. Gently wipe with a soft-bristled brush or soft cloth if biofouling is present. Use Alconox ® to
remove grease.
4. If extensive fouling or mineral build-up is present, soak the cap end in vinegar for 15 minutes,
then soak in deionized (DI) water for 15 minutes.
Do not use organic solvents—they will damage the sensing element. Do not remove
the cap from the sensor prior to cleaning.
5. After cleaning, perform a 1- or 2-point user calibration or calibration check.
4.1.1 Clean the Optical Window
Clean the optical window only when you change the cap. See full instructions in the
sensor cap replacement kit.
Remove the cap and gently wipe the lens with the supplied lens cloth. Do not wet
the lens area with water or any solution.
Use only the supplied lens cloth for cleaning. Do not use any other cloth or material.
4.2 Clean the Probe
With the RDO cap installed on the probe, gently scrub the probe with a soft-bristled brush or nylon
dish scrubber. Use Alconox to remove grease or other matter. Soak in vinegar and DI water to
remove mineral deposits or extensive fouling as described in step 4, above.
4.3 RDO Cap Storage
Prior to installation: Store in factory supplied container.
Installed: Store in the calibration chamber with the storage cap attached (see section 2.1.1) and a
few drops of clean water.
4.4 Replace the RDO Cap
The RDO cap has a 1-year life after the sensor takes its first reading. Replacement caps are
available from In-Situ Inc. or your authorized In-Situ distributor.
1. Remove the probe nose cone.
2. Use a lint-free cloth to remove any moisture from the probe.
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 thin layer of 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.
Do not transfer grease to the lens or sensor pins.
Page 9 Care and Maintenance