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Dissolved Oxygen Sensor Troubleshooting and FAQs

About this FAQ

  • Created May 7, 2005
  • Updated Mar 27, 2014
  • Article #1413

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Dissolved Oxygen Probe, order code DO-BTA, $209
Specifications and User Guide

TROUBLESHOOTING
-Primary Test: Is the D.O. Sensor connected to an interface with a pH, Conductivity, ISE, or Direct-Connect Temperature Probe? If so, remove the other sensors while using the D.O. Probe.
-Primary Test: Make sure that the probe is placed in a large container or water and that the sensor is gently swirled during data collection.
-Secondary Test: If calibration is unsatisfactory, remove and refill the membrane cap with electrode solution and calibrate the probe again.
-Secondary Test: Check for an air bubble inside the membrane cap.

RELATED TIL ENTRIES
-TIL 372: Tips and tricks for using the Dissolved Oxygen Probe
-TIL 1060: Do any of your sensors require special storage?
-TIL 761: Do you sell the DO Calibration Solution (sodium sulfite)?
-TIL 1942: What is the recipe for your Dissolved Oxygen Filling solution?
-TIL 1399: Can I use Vernier water quality sensors in salt water or in a salt water aquarium?
-TIL 1451: What sensors work with EasyLink and EasyData?
-TIL 685: How can I provide power for my interface when used in the field for long-term data collection?
-TIL 638: Why am I getting interference when I put two sensors in the same solution?
-TIL 355: How many times can you use a DO membrane cap?
-TIL 2382: DO calibration: Is the temperature on the chart the air temperature or the water temperature?

SPECIFICATIONS
-new order code: DO-BTA
-old order code: DO-DIN
-Range: 0 to 15 mg/L (or ppm)
-Accuracy: +/-0.2 mg/L
-Resolution, 12-bit (LabPro, Go! Link, ULI II, Serial Box): 0.007 mg/L
-Response Time: 95% of final reading in 30 seconds, 98% in 45 seconds
-Temperature Compensation: automatic from 5 to 35 deg C
-Pressure Compensation: manual, accounted for during calibration
-Salinity Compensation: manual, accounted for during calibration
-Minimum Sample Flow: 20 cm/s

CALIBRATION
-Calibrate? Not always. If your experiment seeks to measure only a change in dissolved oxygen then the stored calibration is suitable. If you plan to make discrete measurements of dissolved oxygen in a natural body of water, then calibration is recommended.
-The calibration process for this sensor is lengthy. Refer to the sensor booklet for detailed instructions.

RELATED VERNIER PRODUCTS
-DO Calibration Solution, order code DO-CAL, $4 (70 mL)
-DO Filling Solution, 125 mL, order code FS, $6 (125 mL)
-DO Polishing Strips, order code PS, $4 (5 strips)
-Membrane for DO Sensor, order code MEM, $13
-Sodium Sulfite, anhydrous solid, 500 g bottle, Flinn Scientific order code S0111

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