Oakton 35631-00 Operating Instructions Manual

Oakton 35631-00 Operating Instructions Manual Manual pdf 21 page image

41407. Probe Care and MaintenancepH electrode careSince your pH electrode is susceptible to dirt and contamination, clean it every oneto three months depending on the extent and condition of use. For specialty elec-trode care, consult the instruction manual included with your electrode.pH electrode storageFor best results, always keep the pH bulb wet. Use the protective electrode storagebottle or rubber cap filled with electrode storage solution to store your electrode (seepage 46 for ordering information). Also, you can store in a pH 4 buffer with 1/100part of saturated KCl. Other pH buffers are OK for storage, but NEVER use distilledwater for storage.After measuring1. Rinse the pH electrode and reference junction in de-ionized water.2. Store the electrode as recommended above in “pH electrode storage,” or asrecommended by the manufacturer.3. Prior to next use, rinse the liquid junction with de-ionized water and tap dry—never wipe electrode. If this does not restore electrode to normal response, see“Reactivating the pH electrode” section below.pH electrode cleaningSalt deposits: dissolve the deposits by immersing the electrode in tap water for tento fifteen minutes. Ten thoroughly rinse with distilled water.Oil/grease film: wash electrode pH bulb gently in some detergent and water. Rinseelectrode tip with distilled water or use a general purpose electrode cleaner (seepage 40 for ordering information).Clogged reference junction: heat a diluted KCl solution to 60 to 80°C. Place thesensing part of the electrode into the heated solution for about 10 minutes. Allow theelectrode to cool in some unheated KCl solution.Protein deposits: prepare a 1% pepsin solution in 0.1 M of HCl. Set the electrode inthe solution for five to ten minutes. Rinse the electrode with distilled water.Reactivating the pH electrodeIf stored and cleaned properly, your pH electrode should be ready for immediateuse. However, a dehydrated bulb may cause sluggish response. To rehydrate thebulb, immerse the electrode in a pH 4 buffer solution for 10 to 30 minutes. If thisfails, the electrode requires activation. Never touch or rub glass bulb. Contactbuilds up an electrostatic charge.CONTINUED ON NEXT PAGE7.1NotesTo clear all pH data, see page 31.See page 51 for a table of factory default settings.P9.0: Resetting to factory default settings (conductivity/TDS)This program lets you reset all conductivity parameters to factory default settings.This clears all calibration data any other conductivity setup functions you mighthave changed. The following settings will remain as you have set them:• temperature unit of measure (°C or °F)• The temperature offset calibration value• All pH calibration data and parametersMEASSETUPmSμSpptppmAMEASSETUPMEASSETUPmSμSmSμSpptppmpptppmB6.10From measurement mode1. Press the Mode key to selectconductivity measurement mode.2. Press Setup key to enter Set Up mode.3. Press the s and t keys to scroll throughsubgroups until you view parameter“P5.0” in the lower display.See figure4. Press the ENTER key.See figure5. Press the s and t keys to togglebetween NO and YES.• NO retains current settings• YES resets to factory default settings6. Press the ENTER key to confirmselection and to return to measurementmode.AB