Vernier Go Direct Gas Pressure User Manual

1

6. Click or tap your Go Direct sensor
from the list of Discovered
Wireless Devices. Your sensor's ID
is located near the barcode on the
sensor. The Bluetooth LED will
blink green when it is successfully
connected.

7. Click or tap Done to enter data­collection mode.

Charging the Sensor

Connect Go Direct Gas Pressure to the included Micro USB Cable and any USB
device for two hours.

You can also charge up to eight Go Direct Gas Pressure Sensors using our
GoDirect Charge Station, sold separately (order code: GDX-CRG). An LED on
each Go Direct Gas Pressure indicates charging status.

Charging

Orange LED next to the battery icon is solid
while the sensor is charging.

Fully charged

Green LED next to the battery icon is solid
when the sensor is fully charged.

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-g p

Connecting via Bluetooth

Ready to connect Red LED next to the Bluetooth icon flashes

when sensor is awake and ready to connect.

Connected Green LED next to the Bluetooth icon flashes

when sensor is connected via Bluetooth.

Go Direct®Gas
Pressure

(Order Code GDX-GP)

Go Direct Gas Pressure is used to monitor pressure
changes in gas-law experiments in chemistry, biology,
and physics.

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 Gas Pressure
l Two tapered valve connectors inserted into a No. 5 stopper
l One tapered valve connector inserted into a No. 1 stopper
l One two-way valve
l Two Luer-lock connectors connected to either end of a piece of plastic

tubing

l One 20 mL syringe
l Two transpiration tubing clamps
l Micro USBCable

Compatible Software

See www.vernier.com/manuals/gd x-g p for a list of software compatible with Go
Direct Gas Pressure.

Getting Started

Please see the following link for platform-specific connection information:

www.vernier.com/start/gdx-g p

Bluetooth Connection USB Connection

1. Install Graphical Analysis 4 on
your computer, Chromebook™, or
mobile device. See
www.vernier.com/ga4 for software
availability.

2. Charge your sensor for at least
2hours before first use.

3. Turn on your sensor by pressing
the power button once. The
Bluetooth®LED will blink red.

4. Launch Graphical Analysis 4.

5. Click or tap Sensor Data
Collection.

1. Install Graphical Analysis 4 on your
computer or Chromebook. If using
LabQuest 2, make sure LabQuest
App is up to date. See
www.vernier.com/ga4 for software
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.

2

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 a Go Direct sensor, 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.

Specifications

Pressure range 0 kPa to 400 kPa

Maximum pressure without
permanent damage

410 kPa

Typical accuracy ±3 kPa

Internal volume 0.8 mL

Resolution 0.03 kPa

Maximum sampling rate 50 samples/s

USBspecification 2.0

Wireless specification Bluetooth 4.2

Maximum wireless range 30 m

Dimensions 9.5 cm × 6.0 cm × 3.25 cm

Battery 300 mA Li-Poly

Battery life (single full charge) ~24 hours with active use

Battery life (long term) ~500 full charge cycles (several years

depending on usage)

Care and Maintenance

Battery Information

Go Direct Gas Pressure 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-300).

Storage and Maintenance

To store Go Direct Gas Pressure for extended periods of time, put the device in
sleep mode by holding the Power 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.

Connecting via USB

Connected and charging Orange LED next to the battery icon is solid

when the sensor is connected to Graphical Ana­lysis via USB and the unit is charging. LED next
to Bluetooth icon is off.

Connected, fully charged Green LED next to the battery icon is solid

when the sensor is connected to Graphical Ana­lysis via USB and fully charged. LED next to
Bluetooth icon is off.

Charging via USB,
connected via Bluetooth

Orange LED next to the battery icon is solid
when the sensor is charging. Green LED next to
the Bluetooth icon flashes.

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

Connect the sensor following the steps in the Getting Started section of this user
manual.

Important: The Go Direct Gas Pressure sensing element will be damaged with
direct contact to liquid.

Videos

View videos related to this product at www.vernier.co m/gdx-g p

Calibrating the Sensor

You do not have to perform a new calibration when using Go Direct Gas
Pressure. The sensor is calibrated prior to shipping.

If you do choose to calibrate, a one-point calibration at atmospheric pressure is
adequate for most applications. Go Direct Gas Pressure has been calibrated to
read station pressure. Station pressure is the true atmospheric pressure at your
location, or station. If you prefer it to read sea-level pressure for conducting
weather studies, you can perform a one-point calibration to correct for elevation,
using the sea-level corrected pressure value for your location obtained from a
reputable source (e.g., NOAA, Weather Underground, etc.). Sea-level pressure is
the pressure after the station pressure has been adjusted to its equivalent pressure
at sea level. This is commonly done to normalize pressures at various altitudes
for weather forecasts.

To calibrate the sensor in Graphical Analysis, complete the following steps.