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YSI ProDSS Calibration And Routine Maintenance
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YSI ProDSS Calibration And Routine Maintenance

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YSI ProDSS Meter Calibration and Routine Maintenance
YSI ProDSS calibration and routine maintenance
General info
Pressure (Barometer) calibration
Conductivity calibration
DO calibration
pH calibration
Turbidity calibration
Temperature calibration check
References
These procedures are to be performed by Streamkeepers staff or trained volunteers. Check
and/or calibrate all parameters at least prior to every quarterly monitoring session, and it's also a
good idea to check calibrations during the month-long monitoring window. If the instrument is
used between seasonal sampling months, additional checking and/or calibration is recommended.
For further details about frequency of calibrations/checks, see "Equipment Calibration &
Calibration-Check General Information."
Be sure the primary reference standards used in the office for calibration are within their
expiration dates (last day of listed month). The ProDSS will automatically store calibration
information into a GLP (good lab practices) file. This includes what was calibrated, who
calibrated it, and when it was calibrated.
Calibration checks and QC criteria: All calibration checks are tied to QC criteria specified in
the Quality Assurance Project Plan (QAPP) for either Streamkeepers or whichever special
investigation is being conducted. Where check results do not meet QC criteria, data gathered for
the parameter(s) in question with that sensor since the time of the last calibration or check must
be qualified per QAPP specifications. It's important to notify program staff when calibration
checks do not meet QC criteria.
Prior to calibrating:
• Make sure all sensors, sensor guard, and calibration cup are clean. If possible, use a
dedicated sensor guard and calibration cup, used for calibration purposes only. For proper
cleaning procedures, see the ProDSS Assembly & Maintenance protocol. Make sure the
sensor guard is in place before installing the calibration cup.
• Fill the calibration cup with a moderate amount of water and rinse the sensor guard and
sensors by gently shaking the sealed cup. Discharge the water and repeat if necessary.
• Below is a schematic of the calibration cup (note the different fill lines), and a picture of the
sensor tips. You may need to reference this image during calibration.
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Summary of Contents for YSI ProDSS

  • Page 1 Be sure the primary reference standards used in the office for calibration are within their expiration dates (last day of listed month). The ProDSS will automatically store calibration information into a GLP (good lab practices) file. This includes what was calibrated, who calibrated it, and when it was calibrated.
  • Page 2 YSI ProDSS Meter Calibration and Routine Maintenance Temperature sensor General Rules about ProDSS Calibration • Buffer solutions must not exceed expiration or “use by after opening” dates. Solutions are good until the last day of the month listed. Use expired buffers for rinses.
  • Page 3 If that is the case, try recalibrating. If that doesn’t work, perform more extensive cleaning (see ProDSS Assembly and Maintenance protocol), order a new pH or DO sensor tip, try fresh calibration reference solutions, or call YSI.
  • Page 4 YSI ProDSS Meter Calibration and Routine Maintenance PRESSURE (BAROMETER) CALIBRATION The YSI ProDSS has a built-in barometer that has been factory calibrated and rarely needs to be recalibrated. The accuracy of the barometer is essential for dissolved oxygen calibration. Before and after each season, check the barometer readings for accuracy by testing against a weather station.

  • Page 5: Conductivity Calibration

    YSI ProDSS Meter Calibration and Routine Maintenance CONDUCTIVITY CALIBRATION Equipment Needed: • Purified water • Mild solution of dish soap and tap water • Cleaning brush found in maintenance kit • Conductivity standard solution *Check date if opened. The solution expires one month after opening.
  • Page 6 If you get calibration error messages, check for proper sensor immersion, verify that the calibration solution is fresh and that the correct value has been entered into the ProDSS, and/or try re-cleaning the sensor (refer to the Maintenance protocol for detailed cleaning techniques for the conductivity sensor).

  • Page 7: Dissolved Oxygen Calibration

    YSI ProDSS Meter Calibration and Routine Maintenance DISSOLVED OXYGEN CALIBRATION Check Settings Dissolved oxygen % units should be in DO % L (local) on one line and DO mg/L on the next. If not, first note what the settings are and notify program staff. Then select the Probe button, then Display, then ODO, and select both DO% and DO mg/L.
  • Page 8 QAPP but is useful as an additional check. To test the calibration of the instrument, the instrument’s reading should differ from the Winkler reading by no more than the nominal accuracy of the ProDSS (± 0.2) added to the nominal accuracy of the Winkler titration (± 0.2 per Hallock and Ehinger 2003).
  • Page 9 YSI ProDSS Meter Calibration and Routine Maintenance Pre-Monitoring Session DO Calibration Procedures The DO sensor should have already been inspected for cleanliness, but if the sensor is visibly dirty, refer to the Assembly & Maintenance protocol for proper cleaning procedures. If more than a third of the black paint on the sensor face is missing, the sensor must be replaced.
  • Page 10 YSI ProDSS Meter Calibration and Routine Maintenance Post-Calibration and Periodic DO Drift Check DO 100% Water-Saturated-Air calibration check: (Instructions are at start of Post-Monitoring Session DO Check Procedure.) It is a good idea to perform this check after having calibrated the DO sensor, as well as from time to time in between calibrations, in order to test the correlation between the air-saturated water and water-saturated air reference environments and whether the meter is drifting unacceptably.
  • Page 11 YSI ProDSS Meter Calibration and Routine Maintenance pH CALIBRATION Equipment Needed: • Purified water • Kimwipes • pH 4, 7 and 10 buffer solutions Perform a 3-point calibration of the pH meter before every monitoring session. Anytime a new lot number of buffer is put into use, calibrate the instrument with the new lot and check the old lot to compare the results;...
  • Page 12 1:1 bleach and water solution for 20-60 minutes. Be sure to remove the probe from the ProDSS bulkhead and plug the empty port (bleach will damage the other probes). After the bleach soak, rinse and then soak the pH probe in tap water for 20-60 minutes to remove any remaining bleach residue.
  • Page 13 YSI ProDSS Meter Calibration and Routine Maintenance 5. Enter the pH buffer value that corresponds to the buffer temperature reading (value should be located on pH buffer bottle) 6. Confirm stabilization by watching the actual readings on the screen; if pH remains within ±...

  • Page 14: Turbidity Calibration

    YSI ProDSS Meter Calibration and Routine Maintenance TURBIDITY CALIBRATION Equipment needed: • NIST-traceable “Zero standard” and/or laboratory-purified water • Certified, laboratory-supplied 4000 NTU formazin stock suspension. This keeps best in a refrigerator, but a closed room-temperature cabinet is sufficient to meet shelf-life requirements.
  • Page 15 YSI ProDSS Meter Calibration and Routine Maintenance calibration point: zero NTU 4. Rinse the sensors and calibration cup with ~2” of “zero standard” or deionized water. Shake off the unit and cup after rinse. 5. SLOWLY pour the deionized water or “zero standard” down the side of the cup (like you’re pouring a beer), to just past the first fill line (170 mL).

  • Page 16: Temperature Calibration Check

    YSI ProDSS Meter Calibration and Routine Maintenance TEMPERATURE CALIBRATION CHECK Temperature is calibrated at the factory and cannot be recalibrated, but needs to be checked before and after each monitoring session. Follow procedures in separate “Temperature Calibration Check” procedure, which covers multiple instruments. QAPP specs for the thermistor-type temperature sensors are ±...