PROBE & MEMBRANE MAINTENANCE
The oxygen probe body is made of reinforced
polypropylene for maximum durability.
A thermistor sensor measures temperature of
the sample. It is recommended that the protec-
tive cap be always kept on the probe when the
probe is not in use.
To replace the membrane or refill it with
electrolyte, proceed as follows:
• Remove the protective cap by gently twist-
ing and pulling it off the
probe (see fig. 1).
• Unscrew the membrane
by turning it counterclock-
wise (see fig.2)
• Wet the sensor by soak-
ing the bottom 2½ cm
(1") of the probe in elec-
trolyte (HI 7041S) for 5
minutes.
• Rinse a new membrane
(HI 76407A) with elec-
trolyte 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 not directly
tap the bottom as this
may cause irreparable
damage to the mem-
brane.
TWIST
AND
PULL
fig. 1
UNSCREW
fig. 2
12
