O2 Gas Sensor (O2-BTA)
Specifications and User Guide

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

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.

-Measurement Range of O2 Gas Sensor: 0%-27%
-Accuracy (@ Standard Pressure 760 mmHg): +/- 1% volume O2
-Resolution, 12-bit (ULI, Serial Box, LabPro, LabQuest – all models): 0.01%
-Resolution, 10-bit (CBL, CBL 2): 0.04%
-Response Time: ~12 seconds to 90% of final value
-Warm-Up Time: Less than 5 seconds to 90% of final value
-Pressure Effect: Directly proportional
-Vout = Vout (standard) × (P/1013)
-Pressure range: 0.5 atm to 1.5 atm
Output Signal Range: 0 to 4.8 VDC, 2.7 to 3.8 VDC @ 21% O2
Output Impedance: 1 K
Input Voltage: 5 VDC +/-0.25 VDC
Gas Sampling Mode: Diffusion
Operating Temperature Range: 5 to 40°C
Operating Humidity Range: 0 to 95% RH
Storage Temperature Range: –20 to +60°C
Dimensions: Sensor Tube: 76 mm length (32 mm largest OD)

-The sensor will not calibrate initially, but will drift over time.
-If you wish to calibrate the sensor, follow the normal 2-point calibration procedure. For the first point, push and hold the calibrate button on the sensor using a paper clip. Enter a value of 0 for this reading. Release the button and take a second reading in air. Enter a value of 20.9% oxygen or a corrected value from the table in the sensor booklet.


Using your LabQuest 2 stylus or a paper clip, you can easily calibrate your O₂ Gas Sensor. #VernierTechTips

A video posted by Vernier Software & Technology (@verniersoftware) on

250 mL Nalgene Bottle w/Lid (CO2-BTL)
BioChamber 250 (BC-250)
BioChamber 2000 (BC-2000)