satlantic suna deep


The Deep SUNA nitrate sensor is the ultimate solution for monitoring nitrate concentrations with AUV's in deep ocean environments.

Satlantic has introduced the Deep SUNA to the line of leading edge UV nitrate sensors. Based on the proven MBARI-ISUS nitrate sensor, the Deep SUNA has been redesigned for easy integration with AUVs of all types. Deep SUNA provides real time, chemical-free nitrate calculations in deep ocean environments using Satlantic’s advanced UV absorption technology.

Deep SUNA features include:

  • Real time nitrate calculation
  • Full UV spectrum for maximum accuracy
  • Real-time temperature/salinity compensation
  • Easy to use UCI software package
  • Simple software based in-field calibrations
  • Corrosion proof anodized aluminum housing with 2000 m depth rating

For AUV integration details, please ask about our third party integration experience. If you have any questions, please contact





Limit of Detection 


0.5 µM (SW with T/S corr. Processing)

2.0 µM (SW processing)

Range of Detection

3000 µM

Accuracy (greater of)± 2 µM (±0.028 mg/l-N) or ± 10% of reading
Precision (short term)
0.3 µM (SW with T/S corr. processing)
2.4 µM (SW processing)
Drift (per hour lamp time)
0.3 µM (SW with T/S corrs. processing)
1.0 µM (SW processing)


Path length10 mm
Wavelength Range190-370 nm
Lamp TypeContinuous Wave, Deuterium Lamp
Lamp Lifetime900 h


Input Voltage8-18 VDC
Power Consumption 7.5 W (0.625 A at 12 V) nominal


MaterialAnodized Aluminum
Depth Rating2000 m
Weight1.8 kg
Displacement1384 cm3



Real-time temperature-salinity correction available  (0-35oC, 0-40 PSU); Requires T/S data from controller.


UCI is a graphical software application that makes setup, operation and in field reference checks easy and robust. UCI is the recommended software for HydroCAT, HydroCAT-EP and SUNA.

UCI makes it easy to:

  • Configure instrument settings and control the instrument in various operational modes
  • Complete reference checks with step-by-step reference check wizards, including PDF reports and reference check file comparison
  • Graphically plot engineering units in real time or via file playback
  • Prepare instrument for deployment through the use of a step-by-step deployment wizards including creating a PDF report of all settings and notes
  • Manage data files and offload data

Download UCI 1.2

Released March 30, 2017
Product Brochure

Navis Biogeochemical Profiling Floats

Wednesday, October 19, 2016
PDF icon Navis-Biogeochemical-Profiling-Floats-2016.pdf
Product Data Sheet

Deep SUNA Datasheet

Tuesday, November 18, 2014
PDF icon 2104_datasheet_DeepSUNA.pdf
Product Manual

UCI Software Manual

Monday, February 13, 2017
PDF icon UCI-1.2-User-Manual.pdf
Product Manual

Alkaline Battery Packs Operation Manual

The purpose of this manual is to describe the safe use of several versions of the Alkaline Battery Pack. The Alkaline Battery Pack was developed as a reliable, easy to use power source.
Monday, January 23, 2012
PDF icon AlkalineBatteryPack-RevE-Manual.pdf
Product Manual

Deep SUNA Manual

Tuesday, March 21, 2017
PDF icon Satlantic-Deep-SUNA-Manual-Rev-C.pdf
Technical Note

REMINDER: SUNA V2 Humidity Bulletin: A complete solution for ingress

Friday, April 7, 2017
PDF icon SUNA-V2-Humidity- Bulletin.pdf

What is the result of using the "Reprocess Nitrate Data" function under the SUNACom Tools Menu ?

The "Reprocess Nitrate Data" tool in SUNACom allows the user to select a calibration file and a raw file.
The resulting ASCII file contains a column for the original Nitrate concentration as calculated by the SUNA, using the calibration file onboard the sensor, and a column of recalculated Nitrate using the chosen calibration file.

  • Riser, S.C., Johnson, K.,Lewis, M.R., Altshuler, T. (2011) Autonomous Measurements of Oceanic Dissolved Nitrate from Commercially Available Profiling Floats Equipped with ISUS APPROVED FOR PUBLIC RELEASE doi:ADA555146


The Hydro-Wiper is an external anti-fouling system designed specifically for use with the SUNA. The Hydro-Wiper keeps the SUNA sample windows clean for several months even in the most aggressive fouling environments, helping prevent costly site visits for manual cleaning and loss of data.


SUNA Anti-fouling guard

The SUNA anti-fouling guard is a semi-circular piece of perforated copper attached to a plastic armature that fits into the sample chamber. The anti-fouling guard provides passive fouling prevention through the release of copper ions that inhibit biological growth in the area. The anti-fouling guard provides a reliable and affordable approach to increase deployment time, decrease operating costs, and collect high quality data for mooring applications. 

SUNA Flow cell

The SUNA flow cell is designed to adapt the SUNA for flow through operations on moorings with pumped flow, ship-board underway systems or for laboratory testing and calibration. The flow cell attaches to the SUNA sample chamber and tightly seals against the optical chamber windows. Nylon barbed fittings are provided to connected the flow cell to available pumped flow.

SBE 5M Pump

The SBE 5M pump module consists of a centrifugal pump head and a long-life, DC, ball-bearing motor contained in a compact, plastic housing for depths to 600 meters. The pump impeller and electric drive motor are coupled magnetically through the housing, providing high reliability by eliminating moving seals. Motor speed and pumping rate remain constant over the entire input voltage range. The motor drive electronics is intrinsically protected against accidental reversed polarity.


Alkaline Battery Pack

Satlantic's reliable and user-friendly Alkaline Battery Packs are available in 102 Ah and 51 Ah capacities. The design of the internal battery compartment allows the user to easily change the D-Cell batteries with off-the-shelf replacements. The battery packs consist of an anodized aluminum pressure case, a D-cell battery compartment and a removable end-cap.