8
2. Slowly stir the sample with the electrode and wait for the reading to
stabilize. This may take a while, depending on the electrode history.
3. Press
CAL
until ‘CAL’ is shown on the display. The readings will blink ‘101.7’
and ‘SA’ will appear. ‘SA’ will not appear if the calibration fails.
4. When the calibration is complete ‘End’ will appear and the meter will return
to the measurement mode. NOTE: Sodium Sulfite can become deposited
on the electrode and on the coined surface of the electrode retaining collar.
The presence of the Sodium Sulfite will negatively affect dissolved oxygen
measurements unless it is removed completelyfrom the electrode.
DISSOLVED OXYGEN MEASUREMENT
(Be sure the electrode is filled and fully polarized. Calibrate daily.)
1. Cover the electrode with the electrode cap. The sponge in the electrode cap
should be moistened (not soaked) with distilled water or tap water.
2. Press
ON/OFF
to turn the meter ON. The meter will self calibrate.
3. Press and hold
MODE
to select the desired unit of measure.
4. Remove the electrode cap.
5. Place the electrode in the sample to be measured. Stir the sample with the
electrode.
6. Wait for the reading to stabilize.
7. Press
ON/OFF
to turn the meter OFF. Rinse the electrode with distilled
water or tap water. Replace the electrode cap.
NOTE: The unit of measure selected when the meter was last turned OFF will
be retained. Stir the sample with the electrode to remove any air bubbles that
may be trapped on the membrane surface and to obtain accurate results. Do
not submerse the electrode above the bottom edge of the electrode collar.
For maximum accuracy, allow sufficient time for the temperature of the probe
to reach the temperature of the sample before taking a reading. The larger
the difference in temperature between the electrode and the sample the
longer it will take for the reading to stabilize. Stabilization will be indicated by
a stable temperature reading on the display. Stabilization time can vary from
10 seconds to 5 minutes. The DO Tracer uses a polarographic sensor, which
consumes oxygen at the sensing surface. This requires a constant movement
of the sample across the membrane to maintain a constant dissolved oxygen
level. It is recommended that the sample be stirred gently with the electrode as
the measurement is made, or if in a laboratory environment, the sample should
be stirred using a stir plate.
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