YSI 6 series Manual do Utilizador descarregar pdf (Página 37)

CALIBRATION PROCEDURE FOR UNATTENDED DEPLOYMENTS

The YSI Rapid Pulse and ROX DO sensors can be calibrated in saturated air or saturated water; both

will give the same results when done correctly. For these deployments we recommend that you calibrate

in saturated water. Saturated water will allow you to check the performance of the other sensors and

eliminate any chance of temperature-related calibration errors. All that is required is a clean five-gallon

bucket, a good quality aquarium air pump, and two air stones.

1. Fill pail to at least 75% capacity with room-temperature tap water.

2. Connect air stone to pump and sparge water for at least one hour before calibration.

3. Place the sonde in the saturated water bath and run in “Unattended Mode”. This will be the file

that the sonde is deployed with.

4. Wait 60 minutes to ensure temperature stability.

Note: The Rapid Pulse DO sensor should be reading very close to the saturated air reading of

your previous air calibration. If it reads more than 2% higher than the reading in saturated air,

then you could have a Rapid Pulse membrane problem. Check for leaks, punctures, or a loose-

fitting membrane retainer o-ring before you calibrate.

5. Calibrate both the Rapid Pulse and ROX DO sensors. Record the barometric pressure at the time

of calibration.

Note: avoid letting air bubbles collect on the membranes, during calibration.

6. Barometric pressure ______________mmHg

Note: pressure divided by 7.6 = calculated DO

Example 760 ÷ 7.6 = 100 %

7. ROX Output ________________% _____________mg/l ± 1%

8. RP Output _________________ % _____________mg/l ± 2%

9. Temperature _____________°C, Salinity ____________ppt

10. Allow the sonde to sample for at least 60 more minutes in this controlled environment. This data

will serve as a pre-deployment DO verification test and will remain part of the data set.

11. When the sonde is recovered, do NOT stop the “Unattended” study in the field! Return the

sonde to the calibration lab and use the saturated water bath for the DO post-calibration. This

data will also be part of the “Unattended” data file.

12. Record the barometric pressure and other parameters at recovery.

13. Barometric pressure ______________mmHg

14. ROX Output ________________% _____________mg/l ± 1%

15. RP Output _________________ % _____________mg/l ± 2%

16. Temperature _____________°C, Salinity ____________ppt

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YSI 6 series Manual do Utilizador Página 37