Vernier Go Direct GDX-ETOH User Manual
1
Getting Started
Please see the following link for platform-specific connection information:
www.vernier.com/start/gdx-et oh
Bluetooth Connection USB Connection
1. Install Graphical Analysis 4 on
your computer, Chromebook™, or
mobile device. If using LabQuest 2,
make sure LabQuest App is up to
date. See www.vernier.com/ga4 for
Graphical Analysis 4 availability or
www.vernier.com/downloads to
update LabQuest App.
2. Charge your sensor for at least
2hours before first use.
3. Turn on your sensor by pressing the
power button once. The LED will
blink red.
4. Launch Graphical Analysis 4 or
turn on LabQuest 2.
5. If using Graphical Analysis 4, click
or tap Sensor Data Collection. If
using LabQuest 2, choose Wireless
Device Setup > Go Direct from the
Sensors menu.
6. Select your Go Direct sensor from
the list of Discovered Wireless
Devices. Your sensor's ID is located
near the barcode on the sensor. The
LED will blink green when it is
successfully connected.
7. Click or tap Done to enter
data-collection mode.
1. If using a computer or
Chromebook, install Graphical
Analysis 4. If using LabQuest 2,
make sure LabQuest App is up to
date. See www.vernier.com/ga4 for
Graphical Analysis 4 availability or
www.vernier.com/downloads to
update LabQuest App.
2. Connect the sensor to the USB
port.
3. Launch Graphical Analysis 4 or
turn on LabQuest 2. You are now
ready to collect data.
Charging the Sensor
Connect Go Direct Ethanol Vapor to the included Micro USB Cable and any
USB device for two hours.
You can also charge up to eight G o Direct Ethanol Vapor Sensors using our Go
Direct Charge Station, sold separately (order code: GDX-CRG). An LED on
each Go Direct Ethanol Vapor indicates charging status.
Charging
Blue LED on steady while sensor is connected to
the Micro USB Cable or Charging Station.
Fully charged
Blue LED is off when charging is complete.
Go Direct
®
Ethanol Vapor
(Order Code GDX-ETOH)
Go Direct Ethanol Vapor measures the concentration of ethanol in the air above
an aqueous sample. This sensor can be used in a wide variety of experiments in
biological, agricultural, food, and environmental studies.
l Determine the rate of ethanol production during fermentation.
l Measure the discrete amount of ethanol in a given sample.
l Investigate which sugars yeast can ferment.
l Identify specific organisms that can utilize ethanol fermentation as a
metabolic pathway.
Note: Vernier products are designed for educational use. Our products are not
designed nor are they recommended for any industrial, medical, or commercial
process such as life support, patient diagnosis, control of a manufacturing
process, or industrial testing of any kind.
What's Included
l Go Direct Ethanol Vapor
l 250 mL Nalgene Bottle
l #6 Stopper
l Replacement cap assembly
l Plumber's Tape
l Micro USB Cable
Compatible Software
See www.vernier.com/manuals/gdx-et oh for a list of software compatible with Go
Direct Ethanol Vapor.
2
Assembly of sensor, cap, tape, and tip
Calibrating the Sensor
It may not be necessary to perform a calibration when using Go Direct Ethanol
Vapor. If your experiment or application is evaluating the rate of ethanol
production, such as determining fermentation rates with yeast, or the relative
change in ethanol concentration, then the stored calibration works well.
For quantitative analysis of ethanol samples, it is best to use a two-point
calibration to improve accuracy. The two points you choose for your calibration
will depend on the expected amount of ethanol in your sample. For best results
at low concentrations (0.1–1%), calibrate using 1% and 0.1% ethanol. For best
results at high concentrations (1.0–3.0%), calibrate using 3.0% and 1% ethanol.
If you are measuring an intermediate range you can also calibrate using 0.2%
and 2.0% ethanol.
To calibrate the sensor in Graphical Analysis, complete the following steps.
1. Click or tap the sensor meter to view sensor options.
2. Select Calibrate and follow the applicable prompts on the Calibrate Sensor
screen.
Once you have calibrated your Go Direct Ethanol Vapor, the calibration is
automatically stored to the sensor and will be used each time you connect to
your device. You can always choose to restore factory defaults if you feel the
custom calibration is invalid.
To restore factory defaults in Graphical Analysis, complete the following steps.
1. Click or tap the live readouts meter and choose Calibrate.
2. Click or tap Reset Calibration.
A window will appear warning you that you are about to reset the calibration.
Choose Reset Calibration.
Making Ethanol Sta ndards for Calibration
To make solutions for the ethanol calibration, you will need to dilute fresh,
stock ethanol to the appropriate concentration. D enatured ethanol or nondenatured, grain ethanol may be used. Ethanol that is 70% is more stable than
95%. For the most accurate results, use a volumetric flask to make the standards.
Use the following equation to guide you:
Powering the Sensor
Turning on the sensor
Press button once. Red LED indicator flashes
when unit is on.
Putting the sensor in sleep
mode
Press and hold button for more than three
seconds to put into sleep mode. Red LED
indicator stops flashing when sleeping.
Connecting the Sensor
See the following link for up-to-date connection information:
www.vernier.com/start/gdx-et oh
Connected and charging Blue and Green LED solid when sensor is con-
nected to Graphical Analysis via USB and unit
is charging. (Green LED is obscured by the blue
one.)
Connected Green LED solid when sensor is connected to
Graphical Analysis via USB and the unit is fully
charged. Green LEDflashing when sensor is connected to Graphical Analysis via Bluetooth wireless technology.
Charging via USB,
connected via Bluetooth
wireless technology
Blue LED is solid and green LED is flashing, but
the green flashing LED looks white because it is
overwhelmed by the blue.
Identifying the Sensor
When two or more sensors are connected, the sensors can be identified by
tapping or clicking Identify in Sensor Information.
Using the Product
1. Remove the tip of the cap from the sensor. Discard the tissue paper covering
the cap (first use only).
2. Cut a 1.5 centimeter piece of plumber’s tape (included).
3. Cover the cap entirely with the tape and inspect the tape for wrinkles or
gaps.
4. Place the tip over the tape and verify that it is secure before proceeding.
5. Connect the probe following the steps in the Getting Started section of this
user manual.
Note: Remove the tape from the cap at the end of the experiment. For best
results, use a new piece of tape each day the sensor is used.
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