4
OPERATION WITH THE NEXSENS X2 LOGGER
About the X2
and X2-SDL
The NexSens X2 is a data logger that directly supports the LISST-AOBS,
using the SDI-12 protocol, as well as many other SDI-12 sensors. The
standard X2 is in a compact weatherproof (but not submersible) housing.
The X2-SDL is functionally identical, but is submersible to a maximum
depth of 60 meters.
Sequoia Scientific and NexSens offer complete packages that include an
X2 or X2-SDL, and all necessary cabling.
For detailed information, see the X2 Document and Resource Library at
https://www.nexsens.com/knowledge-base-v2/data-loggers/x2
, and the
https://www.nexsens.com/knowledge-base-v2/data-
Logging process
X2 loggers are optimized for long-term monitoring applications, in which
they wake periodically, collect a sample, then return to low-power sleep
mode until the next sample. The factory-default sample period is 10
minutes, but can be changed through the X2
’s Wi
-Fi interface, or through
the CONNECT software.
Data storage &
transmission
The logging of LISST-AOBS data on an X2 is controlled by a script provided
with the X2. The standard script
1.
powers the LISST-AOBS 10 seconds before the scheduled sample
time, running the anti-fouling wiper on the turbidity sensor, then
2.
collects a 30-second average of LISST-AOBS data, and
3.
logs the averaged values.
X2 loggers store data in their onboard memory, but also support
automatic uploading through a Wi-Fi, cellular, radio, or satellite
connection (depending on hardware configuration). Data then appear in
near-real-time on the WQDataLive website. Raw data can also be
offloaded directly to a computer through a USB port.
WQDataLIVE
WQData LIVE is a web-based platform for collecting and displaying data
from Nexsens loggers. Users of X2 loggers can set up projects on this
platform, free of charge. A project can have one or more X2 loggers
associated with it, and those loggers can automatically deliver their data
to the site through a WiFi, cellular, radio, or satellite connection
