Skip to main content

Flexible subsea data processing unit & logger, DPU


The KONGSBERG Data Processing Unit (DPU) is a highly flexible and adaptable subsea data logger. The logger can be interfaced with analog, RS232, RS485 and Ethernet sensors. The DPU is capable of processing the sensor values into key data, min / mean / max, or events for example that can be efficiently transmitted via the cNODE® acoustic link, either to a vessel or via a subsea transponder network.

Event based changes in the measurement frequency is one of the more important features of the DPU especially in power limited applications. The KONGSBERG DPU is an integral part of the K-Lander system but is also available as a stand alone product.

The DPU can interface to multiple sensors with data stored to the SD or dual SD / SSD drive and communicated via acoustic modem, optical link or Ethernet. An extensive interface library is available for ADCPs, current meters, CTDs, pH sensors, CO₂ sensors, CH₄ sensors, hydrophones, sonars etc. Additional interfaces to integrate other sensor can be developed on request. All data is timestamped and logged by the DPU, however when data must be transmitted real time, it may be telemetered via a cNODE® transponder to the sea surface or relayed across a subsea network of cNODEs (consisting of e.g. several DPUs and cNODES).

The DPU includes 128 GB of data storage as standard (116 GB usable) which can be extended to 4 TB with an option for redundant storage of key data. All data is stored in a database that guarantees easy access to all raw and condensed data. Online calculation of derived data (e.g. CH₄ concentration from CH₄ and CTD data) is a standard feature of the DPU.

All collected and derived data (and possibly data from remote sensor nodes) can be used to take action based on specific events. A typical example is the change in measurement frequency based on a significant increase of the measured CH₄ concentration in comparison to the reference station (data exchange via acoustic link).

The DPU is optimised for low power battery based applications like lander systems but can also be used in scenarios where processing power and data throughput are a priority.

KONGSBERG can provide service and support starting from concept stage up to the deployment of the sensors systems and the interpretation of data. The support is provided by our in-house team of scientists as well as a team of highly trained field engineers.


DPU dimensions
Standard interfaces 8 x RS232 interfaces
1 x RS485 interface
1 x 100 Mbit Ethernet
2 x 16 bit analog
Optional Add-on RS232 interface (up to 8)
Add-on Analog interface (24 bits, up to 8)
4 x 1 Gbit Ethernet (more on request)
Connected power supply 12 – 30 V
Battery power supply typically via Power Management Units (PMUs) One PMU can source from up to 16 cNODE® batteries (1 cNODE® battery:14.4 V, 128 Ah)
Up to four PMUs per DPU (totalling in64 cNODE® batteries)
Standard depth capability 3000 m
Housing material Titanium grade 2
Dimensions 478 mm x Ø 136 mm
Weight 11.5 kg in air, 4.4 kg in water
Standard connectors 15 x SubConn MCBH8F
1 x SubConn DBH13F (other availableon request)

Standard sensor interface library

  • HydroC CO₂
  • HydroC CH₄
  • HydroFlash O₂
  • Seabird CTDs
  • SeaFET
  • Teledyne and Nortec ADCPs
  • KONGSBERG sonars
  • icListen hydrophones
  • Others on request

Standard acoustic interfaces

HiPAP Cymbal acoustic protocol compatible with cNODE®, μPAP, HiPAP®

Software options

  • Mission planner
  • Deployment software
  • Acoustic topside

Services and support

  • 24/7 Technical support

    Our 24/7 technical support team is there to help at any time, day or night, wherever your vessel is.


    We understand the importance of having the right parts, available in the right place, at the right time.

  • Training

    Ensure that your crew is properly and thoroughly trained. This will reduce operational risk, downtime and maximise return on asset investment.