Ethanol Sensor, order code ETH-BTA, $109
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 voltage reading is stable and greater than 4.5V 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 plug the sensor in.

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.

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.

5. The ethanol sensor cannot be used with Go!Link (GO-LINK) as the sensor draws too much current.

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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%

13-bit (SensorDAQ): 0.01% from 2-3%
0.005% from 1-2%
0.0005% from 0-1%

12-bit (LabPro, LabQuest – all models):
0.02% from 2-3%
0.01% from 1-2%
0.001% from 0-1%

10-bit (CBL 2)
0.1% from 2-3%
0.04% from 1-2%
0.004% from 0-1%

Response time 95% 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. Follow the two point calibration procedure outlined in the sensor booklet or in Do I need to calibrate Vernier ethanol sensors?
Calibration information for ETH-BTA:

Equation: power function
Y = C*X^p
C: -2.995
p: 0.9054

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)