NexSens X2-SDL User Guide

The NexSens X2-SDL Submersible Data Logger is a rugged, self-powered remote data logging system used for deploying environmental sensors in lakes, streams, rivers, wetlands, coastal waters, sewers, and culverts without fear of accidental flooding.



First Time Setup

Connect Sensors

Note that certain sensors require configuration prior to interfacing with an X2-series data logger. See the sensor section of the NexSens Knowledge Base for setup information.

Knowledge Base

The X2-SDL is configured with three sensor ports (P0, P1, & P2) for connection to industry-standard digital interfaces including RS-232, RS-485 and SDI-12.

Connect all desired sensors to the X2-SDL via any combination of the three available sensor ports after removing the pre-installed  blank plugs.

X2-SDL Sensor Ports


Important:  Record the port number (P0, P1, or P2) occupied by each sensor.  After the initial setup, sensors must always be reconnected to the same port for proper communication.

Apply Power

The battery lid is designed to be watertight at depths to 200 feet. Tight O-ring seals are required to maintain this pressure rating and may make lid removal difficult.

The lid removal tool (3/16” handled Allen wrench) supplied in the X2-SDL maintenance kit can be used for additional leverage when removing the battery lid from the communication bulkhead.


Battery compartment lid removal


Install 16 D-Cell batteries (4 in each tube). Ensure that the batteries in each tube are in the same positive (+) and negative (-) orientation. Orientation labels are adhered to the inside and top of the battery tubes.

Install D-Cell batteries into the battery compartment


While reconnecting the battery lid:

  • Listen closely for the diagnostic beeps from the data logger
    • 1 immediate beep confirms the power connection
    • 2 beeps after ~ 20 seconds affirms a strong telemetry signal
    • 3 beeps after ~ 20 seconds indicates a weak telemetry signal (Try relocating the buoy or logger)

Sensor Auto-Detection

Following the power-up beep, the logger will automatically  begin to scan through a list of common sensors to build the deployment sensor list. Sensors discovered during this process will automatically be updated on WQData LIVE via the X2’s on-board telemetry.

Sensor detection will take approximately 10 minutes. Leave the full system connected and powered while proceeding through the WQData LIVE setup. Following detection, sensor readings will be logged and uploaded at a 10 minute interval until adjusted by the user.

Configure WQData LIVE Data Center


WQData LIVE interface


WQData LIVE is a Cloud Data Center used in conjunction with the X2-CB data logger to:

  • Upload and store logged data
  • Generate and Export historical data reports
  • Monitor logger diagnostics
  • Remotely configure logger settings

Complete the following to set up the data center project for the X2-CB. Once complete, verify that sensor detection completed successfully and all sensors and parameters have been updated on the web.

  1. Creating a WQData LIVE Account
  2. Creating a Project on WQData Live
  3. Adding a Data Logger to a Project on WQData Live