Vernier Tech Info Library TIL #1421

O2 Gas Sensor Detail Information

O₂ Gas Sensor, order code O2-BTA, $188.00
Specifications and User Guide

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.

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.

RELATED TIL ENTRIES
TIL 1134: Tips for using the CO2-O2 Tee
TIL 1108: What Vernier equipment is used with the Holt Spectrum Science manuals?
TIL 1020: What are the CO2 Gas Sensor power issues? Can I use two CO2 Gas Sensors at the same time?
TIL 1060: Do any of your sensors require special storage?

SPECIFICATIONS
-Measurement Range of O2 Gas Sensor: 0%-27%
-Accuracy (@ Standard Pressure 760 mmHg): +/- 1% volume O2
-Resolution, 12-bit (ULI, Serial Box, LabPro): 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) x (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)

CALIBRATION
-Calibrate? Usually, no. The sensor is set to the stored calibration before shipping.
-If you wish to calibrate the sensor, follow the normal 2-point calibration procedure. For the first point, push and hold the zero button located on the top of the sensor. Enter a value of 0 for this reading. Release the button and take a second reading. Enter a value of 20.9% oxygen or a corrected value from the table in the sensor booklet.

RELATED VERNIER PRODUCTS
-250 mL Nalgene Bottle w/Lid, order code CO2-BTL, $3.00
-CO₂ to O₂ Tee, order code CO2-TEE, $5.00
BioChamber 250, order code BC-250, $6.00
BioChamber 2000, order code BC-2000, $19.00

Created by: jrandall on May 07 2005
Last updated by: aplank on May 12 2009