3
Specifications
Range (%)
0 to 3%
Accuracy (factory calibration)
±1.5% at 3%
Accuracy (factory calibration) 1–3%
±0.5% at 3%
Accuracy (factory calibration) 0.1–1% ±0.3% at 1%
Response time
90% of full scale in 60 seconds
Type
Metal Oxide
Wireless specification
Bluetooth 4.2
Maximum wireless range
30 m
Battery
650 mA Li-Poly
Battery life (single full charge)
~24 hours
Battery life (long term)
~500 full charge cycles (several years
depending on usage)
Care and Maintenance
Battery Information
Go Direct Ethanol Vapor contains a small lithium-ion battery. The system is
designed to consume very little power and not put heavy demands on the
battery. Although the battery is warranted for one year, the expected battery life
should be several years. Replacement batteries are available from Vernier (order
code: GDX-BAT-650).
Storage and Maintenance
To store Go Direct Ethanol Vapor for extended periods of time, put the device
in sleep mode by holding the button down for at least three seconds. The red
LED will stop flashing to show that the unit is in sleep mode. Over several
months, the battery will discharge but will not be damaged. After such storage,
charge the device for a few hours, and the unit will be ready to go.
Exposing the battery to temperatures over 35°C (95°F) will reduce its lifespan. If
possible, store the device in an area that is not exposed to temperature extremes.
Note:
It is recommended that you wash the Nalgene bottle by hand. Most
dishwashers will melt plastic bottles.
Water Resistance
Important:
Go Direct Ethanol Vapor is neither waterproof, nor is it water
resistant and should never be immersed in any liquid.
C
1
V
1
=
C
2
V
2
•
C
1
is the concentration of the stock solution (typically 70% or 95%).
•
V
1
is the amount of stock solution to be added (you will solve for this).
•
C
2
is the desired concentration in %.
•
V
2
the total final volume.
•
V
2
–
V
1
= amount of distilled water to add to the stock solution.
It may be necessary to do a serial dilution in order to get the precision you need
for your standards. The following table shows an example of a serial dilution to
make 0.1% ethanol starting with 70% ethanol.
Original
concentration of
ethanol
Amount of
ethanol to add
(mL)
Final volume
(ethanol and water)
(mL)
Final
concentration
70%
14.3
100.0
10%
10%
10.0
100.0
1%
1%
10.0
100.0
0.1%