PROBE MAINTENANCE
27
15. PROBE MAINTENANCE
The oxygen probe body is made of reinforced plastic for maximum durability.
A thermistor temperature sensor provides temperature measurements of the sample. Use
the protective probe cap when not in use.
To replace the membrane or refill with electrolyte, proceed as follows:
y
Remove the protective cap by gently twisting and pulling
it off the body of the probe (see fig. 1).
y
Unscrew the membrane cap by turning it counterclockwise
(see fig. 2).
y
Wet the sensor by soaking the bottom 2½ cm (1”) of the
probe in electrolyte (
MA9071
) for 5 minutes.
y
Rinse the new membrane cap (
MA841
), supplied with the
meter with electrolyte solution while shaking it gently.
Refill with clean electrolyte solution.
y
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.
y
Make sure that the rubber O-ring sits properly inside the
membrane cap.
y
With the sensor facing down, slowly screw the membrane
ap clockwise. Some electrolyte will overflow.
The Platinum cathode (#8 in the Probe Functional Description) should always be bright
and untarnished. If it is tarnished or stained, the cathode should be cleaned. You can use
a clean lint-free cardboard 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.
TWIST
AND
PULL
UNSCREW
