Nova-Tech pH 110 - Manual (Page 63)

Instruction Manual CyberScan pH 11 / 110
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11.4 Rejuvenation Procedure
1. Dip and stir the electrode in freon or alcohol for 5 minutes.
2. Leave the electrode in tap water for 15 minutes.
3. Dip and stir the electrode in concentrated acid (e.g. HCl, H2SO4) for 5
minutes.
4. Repeat Step 2.
5. Dip and stir in strong base (NaOH) for 5 minutes.
6. Leave for 15 minutes in tap water.
7. Test with standard calibration buffer solutions.
CAUTION: Proper eyewear and gloves must be worn when preparing these
chemicals and performing this operation.
Finally, test with standard calibration buffer solutions to see if the electrode yields
acceptable results. You may repeat steps ‘3’ to ‘6’ again for better response
(maximum 3 times). If the response does not improve, then the electrode has
completed its useful life. Replace with a new electrode.
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