60
The oxygen probe is made of reinforced plastic for maximum durability.
A thermistor temperature sensor provides temperature measurements
of the sample. Use the protective cap when not in use.
To replace the membrane or refill with electrolyte, proceed as follows:
Remove the protective cap by gently twisting, and pulling it off the
body of the probe (see fig. 1).
Unscrew the membrane cap by turning it counterclockwise (see fig. 2).
Wet the sensor by soaking the bottom 2
1
/
2
cm (1’’) of the probe in
electrolyte for five minutes.
Rinse the new membrane cap, supplied with the meter with electrolyte
solution while shaking it gently. Refill with clean electrolyte solution.
Gently tap the sides of the membrane cap with your finger tip to ensure
that no air bubbles remain trapped. Do not tap directly the bottom
with your finger, as this will damage the membrane.
Make sure that the rubber O‑Ring sits properly inside the membrane
cap. With the sensor facing down, slowly screw the membrane cap
clockwise. Some electrolyte will overflow.
The Platinum cathode (#8 in the Probe Functional Description page 9)
should always be bright and untarnished. If it is tarnished or stained,
the cathode should be cleaned. You can use a clean lint‑free paper
towel or cloth. Rub the cathode very gently side to side 4‑5 times. This
will be enough to polish and remove any stains without damaging the
platinum tip. Afterwards, rinse the probe with deionized or distilled
water and install a new membrane cap using fresh electrolyte and
follow the steps above. Recalibrate the instrument.
Important
In order to have accurate and stable measurements, it is important that the membrane surface is in
perfect condition. This semipermeable membrane isolates the sensor elements from the environment
but allows oxygen to enter. If any dirt is observed on the membrane, rinse carefully with distilled or
deionized water. If any imperfections still exist, or any damage is evident (such as wrinkles or tears‑holes),
the membrane should be replaced.
Make sure that the O‑Ring sits properly in the membrane cap.
PROBE MAINTENANCE
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