NexSens X3-SUB Submersible Data Logger

The X3-SUB Submersible Data Logger is a rugged, self-powered remote data logging system specifically designed for offshore use without fear of accidental flooding.


  • Wet-mateable sensor and power ports with integrated wireless communications
  • Optimized for use with CB-75 data buoy for monitoring water or atmospheric conditions
  • Withstands extreme wave action, floods, and periodic & long-term deployment underwater
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The X3-SUB Submersible Data Logger is a rugged, self-powered remote data logging system specifically designed for offshore use without fear of accidental flooding. The system is configured with three sensor ports for connection to most environmental sensors including multiparameter sondes, water quality sensors, temperature strings, ADCP’s, water level sensors, and weather stations. All connections are made using MCIL/MCBH wet-mate connectors, and the built-in sensor library automatically facilitates setup and configuration. Sensor data is recorded on common or independent schedules.

Unlike many data loggers, the X3-SUB can withstand extreme wave action, floods, periodic & long-term deployment underwater, and more. The Type 316 stainless steel housing is completely sealed and waterproof for long-term sub-surface data logging. When fitted for wireless remote communication, the cellular and satellite antennas are also waterproof. The X3-SUB can be powered by internal SLA battery, alkaline battery pack, or external 12 VDC power. The internal SLA battery is intended for use with the CB-75 Data Buoy for continuous power via solar charging.

Using Bluetooth or a USB adapter and CONNECT Software, users can configure the X3-SUB data logger for deployment, view live data, change settings, or troubleshoot. Optional integrated 4G LTE cellular or Iridium satellite telemetry modules offer 2-way 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, email/text alarms, public portal, API, and much more.

Material: Type 316 stainless steel
Weight: 12.0 lbs. (5.44kg)
Dimensions: 5.5" (13.97cm) diameter with 7.25” (18.42cm) flange x 13.63" (34.62cm) height
Internal Power: 6 A-Hr SLA battery, 12 VDC
External Power Requirements: 10.7 to 16.8 VDC +/-5%; includes reverse polarity protection, over voltage protection (OVP), and under voltage lock out (UVLO) protection
Current Draw (Typical @ 12VDC): Sleep: 450uA; Active: 55mA; 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: -40°C to 70°C
Rating: IP68
User Interface: Wireless Bluetooth or wired RS-485 via USB adapter to CONNECT Software; WQData LIVE Web Datacenter with optional wireless telemetry; Status beeps
Real Time Clock (RTC): <30sec/month drift1; Auto-sync weekly2; Internal backup battery
Data Logging: 8 MB non-volatile flash memory; >1 year storage with 20 parameters at 15-minute interval; Max 200 parameters per log interval
Log Interval: User configurable from 1-minute (10-minute default)3; Unique interval per sensor
Transmit Interval: User configurable from 5-minute (10-minute default)
Transmission Trigger: Time-based; Selective parameter upload option
Sensor Interfaces: RS-232 (3 Channels), SDI-12, RS-485, Pulse Count
Sensor Power: (2) independent switches from input supply4,5
Built-in Sensors: Temperature (-40° to 100°C, 0.016°C resolution, ±0.3°C accuracy); Humidity (0% to 100%, 0.03% resolution, ±4% accuracy from 5 to 95% RH; System voltage; System current; System power; Real-time clock (RTC) battery voltage
Sensor Ports: (3) MCBH-8-MP for sensor interface (RS-232, RS-485, SDI-12, Power, GND)
Power Port: (1) MCBH-6-FS for power and communication (12V Solar In, Power Switch, RS-485 Host, GND)
Telemetry Options: 4G LTE global cellular; Iridium satellite
Antenna Port: Type N female

1Assumes 25ºC operating temperature
2Requires the X3-SUB 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

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