VWR International 89231-656, User Manual

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2. Attach the storage tube for the dissolved oxygen probe to the dissolved oxygen probe on the
multisensor.
3. Connect the multisensor to the meter. Turn the meter on.
4. Wait for the dissolved oxygen probe to polarize. Refer to Table 1 for the amount of time.
5. Enter the atmospheric pressure and salinity on the meter.
6. Turn the storage tube for the dissolved oxygen probe and remove it from the dissolved oxygen
probe on the multisensor.
7. Rinse the storage tube for the dissolved oxygen probe with deionized water.
8. Invert and shake the storage tube for the dissolved oxygen probe to remove any water droplets.
Table 1 Polarization times
Disconnect time Polarization time
Less than 5 minutes 10 minutes
5–15 minutes 45 minutes
More than 15 minutes 6 hours
Calibration
Before calibration:
Prepare the probe for use. Refer to Preparation for use on page 5.
Prepare the meter. Refer to the meter manual.
Calibration notes
• For maximum accuracy, calibrate the probe at least once a day.
• Prepare fresh standard solutions for the calibration.
• The calibration and sample measurement conditions must be as similar as possible (e.g., the
temperature of the solution, stir procedure, stir rate and position of the probe).
• For conductivity calibration, use 1-point calibration and select the standard nearest to the expected
measurement range.
• Calibration of conductivity cells is important as the conductivity cell constant can change with time
and calibration identifies the actual cell constant versus the nominal value.
• Do not dilute conductivity standards or samples.
• For dissolved oxygen calibration, a water-saturated air calibration is recommended. Refer to
Dissolved oxygen probe calibration procedure – water-saturated (100%) air on page 7.
• When the probe is submerged, make sure that there are no air bubbles under the probe sensor
tip(s). Gently shake the probe from side to side to remove any air bubbles.
• Make sure that the reference junction is fully in the solution.
• Do not put the probe on the bottom or sides of the container.
• If stabilization is slow, shake the probe from side to side in the solution.
• If a calibration error occurs, refer to
Troubleshooting on page 12.
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