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Dissolved Oxygen Sensor Troubleshooting and FAQs

About this FAQ

  • Created May 7, 2005
  • Updated Feb 6, 2015
  • Article #1413

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

TROUBLESHOOTING
-Primary Test: If the probe is filled with the correct filling solution, the blue protective cap is removed, and it is being gently stirred in the water, the readings should be reasonable (6 mg/L to 10 mg/L is typical).
-Secondary Test: Is the DO Sensor connected to an interface with a pH, Conductivity, ISE, or Direct-Connect Temperature Probe? If so, remove the other sensors while using the DO Probe.
-Secondary Test: If the readings are unsatisfactory, try a new membrane cap and calibrate the probe.
-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 3222: What is the difference between a regular Dissolved Oxygen Probe and the Optical DO Probe? Which one should I buy?
-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?
-TIL 3296: Can I use the DO Electrode Filling Solution past its expiration date?
-TIL 3391: How do I sterilize a Dissolved Oxygen Probe?

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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