O₂ Gas Sensor (O2-BTA)

• Specifications and User Guide
• Which Oxygen Gas Sensor do I have?

Troubleshooting

• Primary Test: Blow on the sensor. Do you see a decrease in the Oxygen Gas reading? This tells you that the sensor is responding.

TIPS

Here are some things to consider:

1. Has the sensor been stored upright? The O₂ Gas Sensor must be stored upright when not being used. This is necessary to maintain the sensor. Failure to store upright will reduce the life of the sensor.
2. Is your data-collection period too short? Diffusion of gases is a fairly slow process; there can be some delay in readings.
3. Are you collecting data in a controlled environment? To collect data in a controlled environment, use the 250 mL Nalgene collection bottle that is included with the sensor.

Additional Troubleshooting

• How to calibrate the O2 Gas Sensor (O2-BTA)
• Do any of your sensors require special storage?
• Can my O2 Gas Sensor (O2-BTA) be repaired?
• Which Oxygen Gas Sensor do I have?
• Can I use a dishwasher to wash the Nalgene bottle that shipped with my O2 or CO2 Gas Sensor?
• How can I insert a CO2 Gas Sensor or O2 Gas Sensor into my own container?
• Can O₂ gas concentration be expressed in units of mg/m³?
• What is the volume of gas displaced by the shaft of the CO₂ and O₂ Gas Sensor? What is the total volume of the Large and Small BioChambers?

Specifications

• Measurement Range: 0–27% (0-270 ppt)
• Accuracy (@ Standard Pressure 760 mm Hg): ±1% O₂
• Typical Resolution: 0.01%
• Response Time: 90% of final reading in ~12 seconds
• Warm-Up Time: Less than 5 seconds
• Pressure Effect:
  ⚬ Directly proportional
  ⚬ V_out = V_out (standard) x (P/1013)
  ⚬ Pressure range: 0.5 atm to 1.5 atm
• Output Signal Range: 0.3 to 5 VDC; 2.7 to 3.8 VDC @ 21% O₂
• Output Impedance: 1 KΩ
• Input Voltage: 5 VDC +/–0.25 VDC
• Gas Sampling Mode: Diffusion
• Normal Operating Temperature Range: 20 to 30 °C
• Operating Temperature Range: 5 to 40°C (with calibration)
• Operating Humidity Range: 0 to 95% RH
• Storage Temperature Range: –20 to 60 °C
• Dimensions:
  ⚬ Sensor Tube: 45 mm length, 28 mm OD
  ⚬ Total length: 135 mm
• Default calibration: slope: 6.6524 %/V; intercept: –2.05%

Calibration

Calibrate? A brand new O2 Gas Sensor does not need to be calibrated, but the sensor will drift over time and will need to be calibrated. If need to calibrate the sensor, follow the normal 2-point calibration procedure. For more information on calibration, see How do I calibrate my sensor?

1. First point
   1. Push and hold the calibrate button on the sensor using a paper clip.
   2. Enter a value of 0 for this reading, then click or tap Keep.
2. Second Point
   1. Release the button and wait for the reading to stabilize.
   2. Enter a value of 20.9% oxygen or a corrected value from the table in the sensor booklet.
   3. Click or tap Keep.

Related Products

• 250 mL Nalgene Bottle w/Lid (CO2-BTL)
• BioChamber 250 (BC-250)
• BioChamber 2000 (BC-2000)
• O₂ Gas Sensor to Spirometer Adapter (O2-SPR)
• Go Direct^® O₂ Gas Sensor (GDX-O2)