4
DISSOLVED OXYGEN PROBE,
continued
Dissolved Oxygen Measurement
After the probe is properly stabilized, chemically zeroed (for
measurements below 1 mg/L), and calibrated, take measurements
as follows:
1. Add the weight assembly to the probe if required (3 m or 15 m
cable versions only).
2. Insert the probe into the sample to the desired depth. Agitate the
probe in the sample to dislodge air bubbles from the sensing area of
the probe tip.
3. Stir the sample vigorously using the probe or a stir stand and stir
bar. When sampling bodies of water, create motion around the
probe tip by pulling on the cable to move the probe up and down
approximately 3-6 inches.
4. When the reading on the meter stabilizes, record the value or store
in meter memory.
Storage
To store the probe between measurements, insert the probe tip into the
provided Calibration/Storage Chamber containing deionized water.
To prepare the probe for long-term storage complete the following:
1. Disconnect the probe from the meter.
2. Remove the membrane cap assembly.
3. Rinse the anode, cathode, and membrane cap assembly with
deionized water.
4. Shake the deionized water out of the membrane cap.
5. Use a clean lab wipe to blot the moisture from the electrode anode
and cathode.
6. Thread the membrane cap assembly loosely onto the body of
the probe.
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