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Subsea SmartDI Logger

Not recommended for new projects. The new NetDI® is used for all high-performance tasks. The SmartDI® is only available on request for special tasks. The support for delivered SmartDI® is as usual.


  • Any sensor data logging, optional special data protocols for e.g. analyzers
  • Complex real-time data processing units
  • Deep-sea monitoring
  • Condition monitoring systems e.g. with alarm function
  • Data logging with extra requirements such as digital outputs, PLC functions


  • Small and versatile data logger with optionally Li-Ion battery
  • Medium power consumption for long deployments
  • Large data storage – enough to safe high-resolution measurements for years
  • Small footprint enables compact housings with embedded power source (Li-Ion battery)
  • Configurable input/output signals – analogue and digital
  • Flexible design for customized solutions
  • Real-time processing of values and additional quality flags and data
  • Many data protocols implemented for external sensors, devices, analyzers etc.
  • Complex control of external actors such as pumps with the build-in Soft-PLC


  • Low power consumption – typ. 2W for the low-power, 5W for the high-performance logger
  • Industrial 2 GB compact flash (CF) card
  • Standardized ASCII NMEA-0183 output – on CF card and real-time RS232 interface
  • Typ. 4 serial Interfaces (RS232, optional RS485), optional up to 36 serial interfaces
  • Wide input voltage range of +9 to 32 Volt, high efficiency DC/DC
  • Typ 1Hz sampling rate, configurable. Short time up to 10Hz. Long time cycles days…years
  • Over 180 calibration and versatile formulas included, incl. UNESCO formulas for seawater analysis
  • Operating IEEE double precision for all internal calculation
  • Over 60 data protocols for external sensors, analyzers, samplers etc.
  • Depth rating shallow water up to 6000m
  • Titanium housing, titanium SubConn® connectors MCBH-5. Typ. size Ø90mm x 380mm length


  • Two CF cards separated for system and data. Each CF card contains also a backup of the other card
  • 2W Low-power system without VGA (Monitor), 2 x RS232 on board; or 5W high performance system with VGA (Monitor) supproted, 4 4 x RS232 on board, expandable
  • Additional DC/DC voltage outputs for external sensors, e.g. 12V, 24V regulated. In combination with the Soft-PLC switchable
  • Connection for PC monitor and keyboard
  • Control LEDs for easy quick check after the deployment
  • Additional up to 36 RS232/RS485 interfaces (needs larger housing)
  • Configurable Soft-PLC for complex control procedures, time or event triggered with many options
  • Position control and geo-referencing e.g. via external data
  • Depth rating certificate (pressure test with static or cycled conditions)

More information

  • SmartDI® subsea data logger with Li-Ion battery: → PowerLogger™
Standard SmartDI® data logger with 4 sensor inputs and 1 host data output. The titanium housing is available up to 6000m SmartDI® data logger with Li-Ion PowerPack™ and exploration sensors as payload installed into a towed underwater vehicle (“fish”) for EMV exploration (c) photo by Mundal AS
Inspection Sensor-Pack installed into a ROV payload frame. It contains 4 additional leak detection sensors for dye, Oil-in-water (PAH), Methane (CH4) and CTD (conductivity). The SmartDI® data logger communicates on a multiplexed line with the OceanView™ software, installed at the control centre Mobile acquisition self-recording sensor system to analyse and compute the CO2 concentration in the Lake Kivu (Rwanda) down to 550m for future details exploration. (c) Photo Wassoc, USA