SeaOWL UV-A™ (SeaWater Oil Finder™)

SeaOWL UV-A™ (Sea Oil-in-Water™ Locator)

Based upon the highly successful WET Labs’ ECO sensor, Sea-Bird Scientific has developed an industry leading detection technology creating a 5X optical resolution improvement over its predecessor.

Sea-Bird Scientific introduces SeaOWL UV-ATM, a new in-situ oil-in-water sensor.  Based-upon the highly successful WET Labs ECO sensor, Sea-Bird Scientific has developed an industry-leading oil-detection technology with 5X optical resolution improvement over its predecessor. 

SeaOWL UV-ATM measures crude oil-in-water using the same UV-A excitation and blue emission wavelengths (370 nm EX/ 460 nm EM) currently used in the ECO CDOM fluorometer. The SeaOWL UV-ATM improves the resolution and range of the ECO with a greater depth of field, optimized electronics and dynamic gain stage modulation.  The new dynamic gain provides industry leading sensitivity across a large detection range making saturation unlikely in even the most heavily impacted environments. The compact SeaOWL UV-ATM design also includes chlorophyll fluorescence and 700 nm backscattering measurements to discriminate crude oil from phytoplankton and other natural sources of FDOM.


  • Industry leading optical resolution
  • Wide dynamic gain prevents measurement saturation even within heavily impacted environments
  • Three parameters in a single sensor: chlorophyll, backscattering, and Fluorescent Dissolved Organic Matter (FDOM)
  • Backscattering and chlorophyll fluorescence provide discrimination of crude oil from phytoplankton and other natural sources of FDOM
Backscattering wavelength700 nm
     Backscattering sensitivity 700 nm11E-06 m-1 sr -1
     Backscattering range700 nm10–0.04 m-1 sr -1
Chlorophyll EX/EM470/690 nm
     Chlorophyll sensitivity0.005 µg/l
     Chlorophyll range0.005–250 µg/l
FDOM EX/EM370/460 nm
     FDOM sensitivity0.03 ppb QSDE
     FDOM range0.03–900 ppb QSDE
Oil Calibration  
     Oil limit of detection3< 80ppb crude oil
     Oil sensitivity43 ppb crude oil
Temperature range of calibration 3-2 to 38 °C
Storage temperature range-20 to 50 °C
Depth rating2000 m
Diameter56.6 mm (2.23 in)
Length54.6 mm (2.15 in)
Weight in air (approx.)340 g
Displacement137 ml
Pressure housing materialTitanium 6Al-4V
Digital output resolution14 bit
Sample rate1 Hz
Connector styleMCBH(WB)-6MP
Input voltage7–15 volts
Current, typical (@7V)81 mA


1) Backscattering specifications are derived from a vicarious calibration with a MCOMS backscattering sensor. Scale factors for backscattering incorporate the target weighting function and the solid angle subtended for the MCOMS optical backscattering sensor. The SeaOWL UV-ATM is highly linear in response to changes in the particle concentration of a specific particle population.

2) The temperature range through which the instruments are tested for operation. The -2° C minimum covers all natural waters on Earth. Please contact Sea-Bird Scientific for testing to higher temperatures.

3) The estimated limit of detection (LOD) for the ECO CDOM fluorometer is <300 ppb cruide oil (Conmy et al., 2014), i.e. 30 counts.  Using the same count to LOD relationship, LOD for SeaOWL UV-A was derived.

4) Applying the ECO CDOM fluorometer crude oil calibration from Conmy et al., 2014, yields this scale factor.

Product Datasheet

SeaOWL™ UV-A datasheet

Monday, December 5, 2016

SeaOWL™ Drawing

Monday, March 27, 2017

SeaOWL UVA-2k Sensor General Dimensions

Friday, November 13, 2015
542251 - SeaOWL-2k General_Dimenions.PDF
Product Manual

SeaOWL UV-A User manual

Tuesday, February 21, 2017
SeaOWL UV-Ad.pdf
White Paper

Oil in Water Fluorescence and Backscattering Relationships

Ian Walsh - Sea-Bird Scientific Ocean Research
Brian Robinson - Fisheries and Oceans Canada, Bedford Institute of Oceanography
John Koegler - Sea-Bird Scientific Ocean Research
February, 2016

Wednesday, February 24, 2016
Oil in Water Fluorescence and Backscattering Relationships.pdf
Technical Note

Cable and Bulkhead Connector Maintenance

Thursday, March 9, 2017

What should I use to lubricate bulkhead connectors?

WET Labs recommends keeping the connectors on your meter lubricated using a good quality silicone spray lubricant, such as 3M Silicone Spray or Loctite 8021 spray. These can be purchased at your local hardware store. Avoid silicone grease. It is messy and attracts contaminants. 

Do not use WD-40. It will destroy connectors.