39
Figure 64
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 ten to fifteen minutes. Thoroughly rinse
with de-ionized water.
b. General dirt and light oil coatings.
Soak the electrode
for several hours in OAKTON general purpose electrode
cleaning solutions. Rinse in deionized or distilled water.
c. Oil/Grease Films
Wash the electrode pH bulb in a little dish washing deter-
gent 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 min-
utes. Allow the electrode to cool while immersed in some
unheated KCl solution or pH 4.01 buffer solution. Rinse
with deionized water.
Conductivity/TDS probe care
Keep the conductivity probe clean. Rinse the probe twice,
and gently swirl it while you take readings. For best accu-
racy, soak a dry probe for at least 5 to 10 minutes or longer
before calibration. Rinse the probe with deionized or tap
water before storing. Never scratch the platinum portions
with a hard substance. Do not strike the probe against any
hard surface.
Do not make continuous contact with your solutions.
Readings will rise over a period of time while you soak your
probe.
Do not immerse the probe in oily solutions. Clean the elec-
trode thoroughly by stirring it in a mild detergent bath or iso-
propyl alcohol. Wipe the probe with a soft tissue paper.
Rinse thoroughly in tap water and then in deionized water.
Recalibrate the meter after cleaning the probe.
The conductivity probe included with your meter features a
removable probe guard to make cleaning easy.
To remove probe guard:
1.
Grip yellow probe guard and twist clockwise.
The locking notch will release.
See Figure 64.
2.
Slide probe guard off end of probe.
locking notch
twist probe
guard clockwise
to remove
Probe model
WD-35608-50
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