NexSens X2-CB Buoy-Mounted Data Logger

The X2-CB is a fully featured data logger housed inside a waterproof enclosure specifically designed to integrate with NexSens' CB-Series data buoys.


  • Integral Wi-Fi, cellular, Iridium satellite & radio options
  • Easily accessible sensor and communication ports
  • Optional WQData LIVE web datacenter for instant access on any web browser
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NexSens X2-CB Buoy-Mounted Data Logger

The X2-CB is an all-in-one environmental data logger specifically designed for use with a NexSens CB-Series data buoy. It automatically recognizes sensors and sends data to the web via Wi-Fi, cellular, radio, or satellite telemetry. The X2-CB includes five sensor ports that are compatible with most environmental sensor protocols including SDI-12, RS-232, and RS-485. All connections are made with a simple waterproof thread-in connector, and the built-in sensor library automatically facilitates setup and configuration. Sensor data is recorded on common or independent schedules.

The X2-CB is powered from the CB-Series buoy’s solar rechargeable battery reserve. Advanced power management combined with ultra-low sleep and run currents extend battery life and reduce the need for larger buoy and solar charging systems. The X2-CB monitors itself while collecting environmental data. Internal temperature, humidity, voltages, and currents are constantly recorded. Failure alerts can be sent automatically to a predefined list of contacts.

The X2-CB integrates the sensor ports, solar panel connector, battery vent, and wireless antenna all on the data well lid for quick installation on CB-Series data buoys. Optional integrated Wi-Fi, cellular, radio, or satellite telemetry modules offer real-time remote communications via the WQData LIVE web datacenter. There, data is presented on a fully-featured and easy-to-use dashboard. Other features include automated reports, alarms, push notifications and much more.

Mount: CB-Series buoy data well plate
Material: 316 stainless steel plate with PVC body
Weight: 10.5 lbs.
Dimensions: 13.5" Diameter, 4.4" Height (6" with cell/radio antenna; 8.125" with Iridium antenna)
Power Requirements
: 5-16 VDC +/-5% (Reverse polarity protected)
Current Draw (Typical @ 12VDC): Low power sleep: 350uA; Active: 45mA; Cellular transmitting: 300mA; Iridium satellite transmitting: 170mA
Peak Current: Power supply must be able to sustain a 500mA 1-second peak current (@ 12V)
Operating Temperature: -20C to 70°C
Rating: IP65
User Interface: RS-485 direct to CONNECT Software, WQData LIVE Web Datacenter, buzzer indicator
Data Logging: 256MB microSD card (expandable up to 4GB)
Data Processing: Parameter level polynomial equation adjustment; Basic & Burst Averaging (min, max, standard deviation, and raw data available)
Real Time Clock (RTC): <30sec/month drift1; Auto-sync weekly2; Internal backup battery
Log Interval: User configurable from 1 minute (10 minute default)3; Independent interval per sensor
Transmission Trigger: Time-based; Selective parameter upload option
Sensor Interfaces: SDI-12, RS-232 (3 Channels), RS485
Sensor Power: (3) independent switches from input supply4,5
Built-in Sensors: Temperature (-40C to 85C, 0.1C resolution, ±0.3C accuracy); Humidity (0% to 100%, 0.1% resolution, ±4% accuracy from 5 to 95% RH & -20 to 70C); Battery voltage; System & sensor current
Sensor Ports: (5) 8-Pin for Sensor Interface (RS-232, RS-485, SDI-12, Switched Power, GND)6
Power Port: (1) 6-Pin for Power and Communication (12V Solar In, Power Switch, RS-485 Host, GND)
Telemetry Options: Wi-Fi, 4G LTE cellular, CAT-M1 cellular, Iridium satellite, 900 MHz radio, 2.4 GHz radio
Antenna Port: Type N female

1Assumes 25ºC operating temperature
2Requires the X2 to be connected to the internet
3Minimum log interval dependent on sensor limitations and processing time
4Cumulative concurrent current limit of all three channels is 2A
5Logger power supply must be able to support current requirements of sensors
6P0A & P0B share a single RS-232 and power channel. P1A & P1B share a single RS-232 and power channel.

  • (1) X2-CB buoy-munted data logger
  • (5) Sensor port plugs
  • (1) Power port plug
  • (1) Quick start guide
  • (1) Wireless antenna (installed on telemetry units only)
Questions & Answers
Is WQDataLIVE free?
Yes, the Basic version of WQDataLIVE is available at no cost. A paid Advanced version is also available with advanced alarming and reporting capabilities.
Can I use the X2-CB with all CB-series buoys?
No, the CB-40 and CB-50 cannot accommodate the logger plate. The CB-50 uses the X2-SDL and the CB-40 model does not have telemetered data options.
Can you use more than 5 sensors?
Yes, the UW-2W and 4W Sensor Splitter will allow the connection of more sensors.
Do I need to purchase an additional cellular antenna?
No, it comes with an antenna integrated into the top of the device.
Can buoy-mounted data loggers use Wi-Fi?
The X2-CB with integrated Wi-Fi can connect to Wi-Fi hotspots with a range of up to 250 feet using the external antenna. This allows data to be pushed up to the WQData LIVE web datacenter without the added costs of cellular/satellite service fees or radio base station hardware. Given the limitations of broadcasting a Wi-Fi signal over open water, this is generally only feasible in near-shore applications (ponds, industrial sites, etc.).
Under what circumstances do X2-CB data loggers need an antenna?
All of the X2-CB data loggers include an external antenna specific to the integrated modem (Wi-Fi, cellular, satellite or radio). Each type of antenna threads to the lid of the logger using an N-Style RF connection. Antenna extension cables are available for situations where the antenna needs to mount up higher on the solar tower, which is common for radio and Iridium satellite applications.
Is it possible to change the frequency of how often data is recorded?
Changing measurement or transmit frequency can be done remotely using the WQData LIVE Web Datacenter or through direct PC connection using the UW6-USB-485P adapter and CONNECT Software.
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