Dissolved Oxygen Sensor Troubleshooting and FAQs

Dissolved Oxygen Sensor, 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 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?

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 (500 mL)
-DO Filling Solution, 125 mL, order code FS, $6 (60 mL)
-DO Polishing Strips, order code PS, $4 (5 strips)
-Membrane for DO Sensor, order code MEM, $13
-Sodium Sulfite Standard Solution, 2.0 M, 65 mL bottle, Flinn Scientific order code SO426
-Sodium Sulfite, anhydrous solid, 500 g bottle, Flinn Scientific order code SO111