62
SECTION 5,
continued
5.
Prepare the
calibration and storage
chamber by holding it
under water and
squeezing it a couple of
times to pull water into
the lower chamber
through the inlet.
Note: Avoid completely
filling the lower chamber
with water.
Alternately, open the
bottom of the chamber
and insert a
water-soaked sponge.
6.
Insert the DO probe
into the calibration and
storage chamber. The
probe tip must not be
flooded with water or be
holding a drop of water
on the membrane.
Note: New sponges will
be compressed. Add
water to expand them.
7.
Wait at least ten
minutes for the
atmosphere in the
chamber to reach a
steady state.
Note: To speed up probe
stabilization, hold the
probe upright and
squeeze the lower
chamber a couple of times
to force water saturated air
into the chamber. Avoid
squeezing water into the
chamber.
8.
Press the
CAL
key.
The display will show
100%.
Note: Keep the DO probe
at a uniform temperature.
When holding the probe,
do not touch the metallic
button (temperature
sensor) on the side of the
probe. The calibration will
be inaccurate if the
temperature of the
thermistor is different from
the probe membrane.
HRS MIN SEC
HRS MIN SEC
cal
0