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 Ana-
lysis 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 Ana-
lysis 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.com/gdx-gp
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.
