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Remove Protein-Like Material or Slimy Film
1. Clean the sensor with warm water and mild soap.
2. Soak the sensor in 0.1M HCI solution for 10 minutes and then rinse with deionized water.
Note: After performing any of these cleaning methods, rinse the sensor with water and then
soak overnight in pH 4 buffer.
Cleaning the RDO Sensor
Clean the Sensor Cap
1. Leave the cap on the sensor.
2. Rinse the sensor with clean water from a squirt bottle or spray bottle.
3. Gently wipe with a soft cloth or brush if biofouling is present.
4. If extensive fouling or mineral build-up is present, soak the RDO Cap end (while the cap is still installed on the
sensor) in commercially available household vinegar for 15 minutes, then soak in deionized water for 15 minutes.
Note: Vinegar is safe for all of the sensors on the probe including the RDO Sensor if the sensor
cap is on.
5. Do not use organic solvents because they will damage the sensing material. Do not remove the cap from the
sensor prior to wiping.
6. After cleaning the sensor cap, perform a 2-point calibration.
Clean the Optical Window
1. Perform this task only once per year when you replace the sensor cap.
2. Pull to remove the sensor cap.
3. Gently wipe the optical window with the supplied lens wipe.
Important: Do not wet the interior lens area with water or any solution.
Cleaning the Conductivity Sensor
1. Before you begin, ensure that the RDO Cap and any removable sensors are in place. Rinse the conductivity
sensor under running water to remove loose material.
2. Follow Cleaning Procedure 1. If debris is still present, progress to the next cleaning procedure. If the debris is
removed, skip to the last step.
Cleaning Procedure 1
Avoid damaging the plastic material of the conductivity cell. Gently scrub the conductivity cell with a soft swab and mild soap
such as a dilute solution of dish detergent. The probe is shipped with polyurethane foam swabs for this purpose. You can also
achieve good results using a gentle back-and-forth motion with a thin cotton pipe cleaner. If debris is still present, continue to
Cleaning Procedure 2. If the sensor is clean, skip to the last step.
Cleaning Procedure 2
Avoid damaging the plastic material of the conductivity cell. Gently scrub the conductivity cell with a foam swab and an
aggressive soap such as Alconox cleaner. If debris is still present, continue to Cleaning Procedure 3. If the sensor is clean,