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Instrument Storage
To store the probe for a week or less, place the probe in the calibration cup with at least 10 mL of clean water to maintain a
moist storage environment.
To store the probe for more than a week, perform the following procedure.
1. Remove the pH/ORP sensor and place the orange pH port plug into the empty pH/ORP port to prevent any
humidity from entering the probe.
2. Locate the sensor storage bottle in which the pH sensor was originally shipped.
3. Open the bottle and remove the O-ring.
4. Add enough pH storage solution or pH 4 solution to cover the sensor bulb (about 10 mL).
5. Slide the O-ring onto the sensor, and then slide the bottle cap over the sensor as shown.
6. Place the sensor tip in the buffer and tighten the cap to prevent the glass bulb from drying.
Cleaning the pH/ORP Sensor
Begin with the gentlest cleaning method and continue to the other methods only if necessary. Do not directly touch or wipe
the glass bulb.
To clean the pH sensor, gently rinse with cold water. If further cleaning is required, consider the nature of the debris to
determine the appropriate method.
Remove Crystalline Deposits
1. Clean the sensor with warm water and mild soap.
2. Soak the sensor in 5% HCI solution for 10 to 30 minutes.
3. If deposits persist, alternate soaking in 5% HCI and 5% NaOH solutions.
Remove Oily or Greasy Residue
1. Clean the sensor with warm water and mild soap.
2. Methanol or isopropyl alcohol may be used for short soaking periods, up to 1 hour.
3. Do not soak the sensor in strong solvents, such as chlorinated solvents, ethers, or ketones, including acetone.