BANTE221 PORTABLE PH/ORP METER
22
Electrode Care and Maintenance
Since pH electrode is susceptible to dirt and contamination, clean as necessary depending on the extent and condition of use.
AFTER MEASURING:
Rinse the pH electrode in distilled water, store the sensor into the electrode storage solution.
CLEANING THE ELECTRODE:
■
Salt deposits:
Soak the electrode in warm tap water to dissolve deposits, then thoroughly rinse with distilled water.
■
Oil or Grease film:
Wash the pH electrode bulb gently in some detergents and water. If necessary, using the alcohol to clean the electrode bulb, then rinse
with distilled water. Place the electrode in the electrode storage solution for 30 minutes.
■
Clogged reference junction:
Heat a diluted KCl solution to 60 to 80
o
C. Place the sensing part of the sensor into the heated solution for about 10 minutes. Allow the
sensor to cool in some unheated KCl solution.
■
Protein deposits:
Prepare a 1% pepsin solution in 0.1M of HCL. Place the electrode in the solution for 10 minutes. Rinse the sensor with distilled water.
REACTIVATING THE ELECTRODE:
If stored and cleaned properly, the electrode should be ready for immediate use. However, a dehydrated bulb may cause sluggish response.
To rehydrate the bulb, immerse the electrode in a pH4.01 buffer solution for 10 to 30 minutes. If this fails, the electrode requires
activation.
■
Soak the electrode in 0.1M HCl for 5 minutes.
■
Remove and rinse with distilled water, then place in 0.1M NaOH for 5 minutes.
■
Remove and rinse again, and soak in electrode storage solution for 30 minutes.
HOW TO PREPARE THE ELECTRODE STORAGE SOLUTION:
■
Dissolve 22.365 grams of potassium chloride reagent (KCL) in the 100mL distilled water.
■
Pour the 50mL of KCL solution into the beaker.
■
Pour the 50mL of pH4.01 standard buffer solution into the same beaker.
■
Stir the solution until the solution has thoroughly mixed. Preparation is completed.
