3
7. Stir the electrode lightly to remove bubbles.
Note
z
Be sure to keep the internal solution filler port open during
measurement. If it is clogged with the solution, accurate
measurement cannot be performed. Wipe the solution with
cloth.
z
For calibration/measurement on pH meter, refer to the
instruction manual of pH meter.
J
Maintenance
Note
Do not use organic solvents (such as acetone or
tetrahydrofuran) or acid (above 1 mol/L) or alkaline (above 0.1
mol/L) cleansing solutions. Using such chemicals may
damage the body of the electrode or cause a decline in
performance.
z
To maintain electrode performance, replace the internal
solution approximately every one or two months.
(Refer to “ Preparation ” (page 2).)
z
Dirt on the responsive glass membrane or liquid junction
by the test solution may cause a decline in electrode
response and sensitivity or measurement error. If the
electrode is very dirty and cannot be washed clean
using pure water, perform cleansing.
Cleansing of electrode
1. Open the internal solution filler port.
2. Immerse the responsive glass membrane and liquid
junction in cleansing agent for approximately one hour
until contamination is removed. The responsive glass
membrane can also be cleaned by wiping it with cotton
gauze containing cleansing agent.
3. Rinse the electrode with pure water completely.
4. Replace the internal solution.
(Refer to “ Preparation ” (page 2).)
Note
Be sure to perform calibration prior to measurement after
cleansing the electrode.
Tip
Applying pressure on the internal solution and exuding it from
liquid junction have an effect of stabilizing pH response.
Type of dirt
Cleansing agent
General
Diluted neutral cleansing agent
Oil
Alcohol, or diluted neutral cleansing agent
Inorganic substance
Electrode cleaner (model 220) or Hydrochloric
acid approximately 1 mol/L
Protein
Cleansing agent including protein-cutting
enzyme (model 250)
Liquid junction
Electrode cleaner (model 220)
Altered of glass,
Slow-response
Electrode cleaner (model 220)
