Thermo Fisher Scientific CyberScan pH 1100/pH 2100 - Manual (Page 55)

Instruction Manual pH 1100/ 2100
55
11 ELECTRODE CARE
11.1 Electrode Activation
DO NOT touch or rub the glass bulb. If you follow the storage and maintenance procedure, you can use your electrode
immediately. If the electrode responds sluggishly or drifts, the bulb may be dehydrated. Immerse the electrode in an
ideal storage solution such as electrode storage solution or pH 4 buffer solution for 1-2 hours to hydrate it. See Storing
pH/ORP electrodes below.
If this procedure does not hydrate the electrode, reactivate or replace it.
Use 2 or 3 point calibration to test your electrode performance. If you do not get good readings, use a different pH
electrode to confirm the meter is working properly. If the results are still not satisfactory, consult your distributor/dealer.
11.2 Electrode Maintenance
pH electrodes are susceptible to dirt, dehydration and contamination. Clean them regularly depending on the extent and
condition of use.
11.3 Storing pH/ORP electrodes
For best results, always keep the bulb wet, preferably in pH storage solution. Other pH buffers or tap water are also
acceptable. Do not store in de-ionized water. Eutech Instruments/ Oakton Instruments offers a complete range of
electrode storage and cleaning solutions.
After Use
1. After each series of measurements, wash the electrode and reference junction in de-ionized water.
2. If using a refillable electrode, close the refilling hole by placing its rubber sleeve or stopper plug into its position.
3. Store the electrode as mentioned above.
Electrode Cleaning
Electrodes that are mechanically intact can often be restored to normal performance by one or a combination of the
following options.
Some suggestions for:
a. Salt deposits which are normal on all electrodes
Dissolve the deposit by immersing the electrode in tap water for 10 to 15 minutes. Thoroughly rinse with de-ionized
water.
b. General dirt and protein coatings
Soak the electrode for several hours in the general-purpose electrode cleaning solutions. Rinse in de-ionized or tap
water.
c. Oil/Grease
Films
Wash the electrode pH bulb in a little dish washing detergent and water. Rinse the electrode tip with de-ionized water.
d. Clogged reference junction.
Heat a dilute 1% KCl solution or pH 4.01 buffer solution to 60-80°C. Place the sensing portion of the pH electrode into
the heated KCl solution for approximately 30 minutes. Allow the electrode to cool while immersed in some unheated KCl
solution or pH 4.01 buffer solution. Rinse with deionized water.