Vernier Software and Technology
Vernier Software & Technology
Tech Info Library

GoDirect Oxygen Troubleshooting and FAQs

Go Direct® O2 Gas Sensor, order code GDX-O2, $189
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.

Please see extended troubleshooting tips in the user manual.

RELATED TIL ENTRIES

TIL 1060: Do any of your sensors require special storage?
TIL 1605: Can my O2 Gas Sensor (O2-BTA) be repaired?
TIL 2318: Can I use a dishwasher to wash the Nalgene bottle that shipped with my O2 or CO2 Gas Sensor?
TIL 2386: How can I insert a CO2 Gas Sensor or O2 Gas Sensor into my own container?
TIL 3846: Can O2 gas concentration be expressed in units of mg/m^3?
TIL 4006: 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?
TIL 4251: How do I calibrate the Go Direct O2 Gas?

SPECIFICATIONS

O2 Gas Sensor Specifications

Type: Electrochemical cell
Range: 0-100% (0-1000 ppt) O2
Accuracy: (at standard pressure 760 mm Hg) ±1% volume O2
Typical resolution: 0.01% O2
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
Pressure range: 0.5 atm to 1.5 atm
Gas sampling mode: Diffusion
Normal operating temperature range: 10 to 40°C
Operating humidity range: 0 to 95% RH

Temperature Sensor Specifications

Type: Thermistor
Range: -25 to 125°C
Accuracy: ±0.5°C
Resolution: 0.1°C
Response time: Less than 5 seconds to 90% of final value
Storage temperature range: -5 to +50°C
Dimensions: Sensor tube: 38 mm length, 28 mm OD; total length: 155 mm
Wireless specification Bluetooth 4.2
USB specification 2.0
Maximum wireless range 30 m
Battery 600 mA
Battery life (single full charge)~24 hours
Battery life (long term)~500 full charge cycles (several years depending on usage)

CALIBRATION

O2 Gas

The sensor is factory calibrated. For many experiments, it will not be necessary to calibrate. However, for more accurate measurements, the sensor can be calibrated using a one-point calibration using a known concentration of atmospheric oxygen. Enter a value of 20.9% oxygen or a corrected value from the table in the Effect of Humidity section of the user manual for air. Once finished, the sensor should read 20.9% (or the value entered in the table).

O2 Gas - w TC

This channel does not allow calibration since it provides temperature compensated readings. To calibrate the sensor, see the instructions above.

Temperature

The sensor is factory calibrated and cannot be calibrated by the user.

RELATED VERNIER PRODUCTS
250 mL Nalgene Bottle w/Lid, order code CO2-BTL, $5
BioChamber 250, order code BC-250, $8
BioChamber 2000, order code BC-2000, $22
O2 Gas Sensor to Spirometer Adapter, order code O2-SPR, $8

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