Go Direct® Ethanol Vapor (GDX-ETOH)
Specifications and User Guide

-Primary Test: Place the sensor over a sample containing 1% ethanol. The readings will rise within a minute to near 1%.
-Secondary Test: Verify that the sensor reads 0.01% or less in air after warming up for 5 minutes.
-Tertiary Test: Check the calibration screen to make sure the live reading is stable when not exposed to ethanol after warming up for 5 minutes.

Things to consider:

1. Did you allow the sensor to warm up? There is a 5 minute warm up period each time you turn the sensor on.

2. Is your data collection time long enough? Diffusion of gases is a fairly slow process and there are delays in readings.

3. Are you collecting in a controlled environment? Use the 250 mL Nalgene collection bottle and split stopper that is included with the sensor for best results.

4. Is your expected concentration of ethanol too high for the sensor? If you are testing something with an expected ethanol concentration above 3%, dilute the sample before collecting.

See all articles for Go Direct® Ethanol Vapor (GDX-ETOH)
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Range: 0% to 3%
Accuracy (factory calibration): ±1.5% at 3%
Accuracy (custom calibration):
1-3%           ±0.5% at 3%,
0.1-1%           ±0.3% at 1%

Response time 90% of full scale in 60 seconds (after initial warm up)

For experiments looking at rate of change, calibration is not necessary. For quantitative analysis, calibration is recommended. Use a two-point procedure for best results. See the user manual for how to prepare standards for calibration.

If the sensor can be turned on when connected by USB but not when disconnected from USB, the battery either needs charging or has reached its end of life and can no longer hold a charge. First, try charging the sensor for several hours. If the sensor still won’t turn on when disconnected from USB, the battery has likely reached its end of life. If you intend to use this sensor wirelessly, the battery will need to be replaced. The rechargeable battery in this sensor is covered by a one year warranty but should last two to five years in typical use.
How do I replace the battery in a Go Direct Wand-Type Sensor?

Ethanol Cap Assemblies (3) (ETH-CAPS)
#6 Stopper for Ethanol Sensor (ETH-STOP)
Tape for Ethanol Sensor (ETH-TAPE)
250 mL Nalgene Bottle w/Lid (CO2-BTL)
BioChamber 2000 (BC-2000)