YSI 6 series Manual de usuario descargar pdf (Pagina 35)

CALIBRATION PROCEDURE FOR DISCRETE SAMPLING

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 water and run in “Discrete Mode” at a one second rate.

4. Wait 10 minutes to ensure temperature stability.

Note: The Rapid Pulse DO sensor should read 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 having air bubbles collect on either membrane, during the 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. DO NOT recalibrate the ROX DO sensor in the field!

11. Do your post-calibration when you return in the same saturated water bath.

Stability and agreement must occur in this controlled environment or good field measurements will not

be made. The ROX and Rapid Pulse membranes must be kept in a saturated air or water during

transportation to the field and in between readings.

Notes:

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YSI 6 series Manual de usuario Pagina 35