User Guide

17
PROBE & MEMBRANE MAINTENANCE
The oxygen probe body is made of reinforced
plastic for maximum durability.
A thermistor temperature sensor provides tem-
perature measurements of the sample tested.
It is always recommended that the protective
cap be kept on the probe when the probe is
not in use to provide protection against dam-
age and dirt.
To replace the membrane or refill it 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
by turning it counter-
clockwise with the
other hand (see fig.2)
• Wet the sensor by
soaking the bottom 2½
cm (1") of the probe in
electrolyte (HI 7041S)
for 5 minutes.
• Rinse the new mem-
brane (HI 76407A) sup-
plied with the meter
with electrolyte while
shaking it gently. Refill
with clean electrolyte.
• Gently tap the sides of
the membrane with your
finger tip to ensure that
no air bubbles remain
trapped. Do no directly
tap the bottom with your
finger as this will dam-
age the membrane.
TWIST
AND
PULL
fig. 1