PROBE MAINTENANCE
General maintenance
After use, rinse the probe with tap water
and dry it. The pH electrode bulb must be
kept moist, while the D.O. and EC sensors
should be stored dry.
Maintenance of D.O. sensor
For a top performance probe, replace
the membrane every 2 months and the
electrolyte once a month. Proceed as
follows:
• Unscrew the membrane by
turning it counterclockwise.
• Rinse the spare membrane
with some electrolyte while
shaking it gently. Refill with
clean electrolyte.
• Gently tap the membrane over a surface
to
ensure that no air bubbles remain
trapped.
• With the sensor facing down, screw the
cap clockwise to the end of the threads.
Some electrolyte will overflow.
If any deposit scales the sensors, gently brush
the sensor surface with the brush supplied in
the maintenance kit, while paying attention
to not damage the plastic body.
Maintenance of EC sensor
After every series of measurements, rinse
the probe with tap water.
If a more thorough cleaning is required,
clean the probe with the brush supplied
in the maintenance kit or a nonabrasive
detergent.
After cleaning the probe, always re-
calibrate the instrument.
Maintenance of pH & pH/ORP sensors
• Remove the protective cap. Do not be
alarmed if any salt deposits are present.
This is normal with electrodes and they
will disappear when rinsed with water.
• Shake the electrode down as you would
do with a clinical thermometer to elimi-
nate any air bubbles inside the glass
bulb.
• If the bulb and/or junction are dry, soak
the electrode in
HI70300
storage solu-
tion for at least one hour.
• To minimize clogging and ensure a quick
response time, the glass bulb and the
junction should be kept moist and not
allowed to dry.
• Replace the solution in the protective cap
with a few drops of
HI70300
storage
solution. Tap water may also be used
for a very short period (couple of days).
NEVER STORE THE ELECTRODE
IN DISTILLED OR DEIONIZED
WATER.
• Inspect the electrode for scratches or
cracks. If any present, replace the elec-
trode.
• Cleaning procedure: clean frequently
the probe by soaking it for 1 minute in
HI70670
or
HI70671
cleaning solu-
tions. After performing this procedure,
soak the electrode in
HI70300
storage
solution before taking measurements.
NOTE
For additional information about
calibration, connections and
readings, please refer to the instru-
ment (
HI9828
multiparameter)
instruction manual.
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