ECO FLbb

The Environmental Characterization Optics (ECO) series of sensors incorporates a common set of options with a single basic design to make them ideal for a wide variety of deployments.

The Environmental Characterization Optics (ECO) combination fluorometer and backscattering sensor allows the user to measure chlorophyll fluorescence at 470 nm and backscattering at 700 nm within the same volume.

The fluorometer allows the user to monitor chlorophyll concentration by directly measuring the amount of chlorophyll-a fluorescence emission from a given sample volume of water. Chlorophyll, when excited by the presence of an external light source, absorbs light in certain regions of the visible spectrum and re-emits a small portion of this light as fluorescence at longer wavelengths.

A blue LED (centered at 470 nm and modulated at 1 kHz) provides the excitation source. The blue light from the sources enters the water volume at an angle of approximately 55–60 degrees with respect to the end face of the unit. Fluoresced light is received by a detector positioned where the acceptance angle forms a 140-degree intersection with the source beam. A red interference filter is used to discriminate against the scattered blue excitation light. The red fluorescence emitted is synchronously detected by a silicon photodiode. Scattering is measured simultaneously by detecting the scattered light from a 700 nm LED at 140 degrees to the same detector used for fluorescence. The scattering measurement is performed at the same 140 degree angle as the chlorophyll fluorescence.

Model Options:

  • FLbb(RT)— Analog and RS-232 serial output with 4,000-count range. Unit operates continuously when power is supplied
  • FLbb(RT)D—Provides the capabilities of the FLbb(RT) with 6,000-meter depth rating
  • FLbbB—The capabilities of the FLbb with internal batteries and memory for autonomous operation
  • FLbbS—The capabilities of the FLbb with an integrated anti-fouling Bio-wiper™
  • FLbbSB—The capabilities of the FLbb with internal batteries for autonomous operation
  • FLbb2k—Designed for float applications but can be use for applications down to 2000m
     

MECHANICAL

Diameter6.3 cm
Length

12.7 cm (standard) / 17.78 cm (deep)

Weight in air

0.4 kg (standard) / 1.3 kg (deep)

Weight in water

0.02 kg (standard) / 0.75 kg (deep)

Pressure housing  Acetal copolymer (standard) / Titanium (deep)
 

OPTICAL

Backscattering wavelength700 nm
Backscattering sensitivity*0.0015 m-1
Backscattering range*0 - 3 m-1
Fluorometer EX/EM470/695 nm
Chlorophyll sensitivity0.015 μg/l
Fluorescence range0 - 30 μg/l
Linearity99%  R2

ELECTRICAL

Digital output resolution12 bit
RS-232 output19200 baud
ConnectorMCBH-6-MP
Input7-15 VDC
Data output rate8 Hz
Operating current typical60 mA
Operating current max.140 mA

ENVIRONMENTAL

Temperature range0 to 30 deg C
Depth rating standard600 m
Depth rating with wiper*300 m
Depth rating deep

6000 m

Linearity (both)99%  R2

*Backscattering specifications are given in beam cp (m-1) based on the regression of the response of the instrument relative to the beam cp measured at the coincident wavelength using an ac-s spectrophotometer. Scale factors for backscattering incorporate the target weighting function and the solid angle subtended.

**The water temperature range through which the instruments are tested. The –2 deg C minimum covers all natural waters on Earth. Please contact WET Labs for testing to higher temperatures.

***The limit depth for ECO with Anti-fouling Bio-wiper™ and Internal Batteries (models B, S and SB) rated to 300 m.

Model Options:

  • FLbb(RT)— Analog and RS-232 serial output with 4,000-count range. Unit operates continuously when power is supplied
  • FLbb(RT)D—Provides the capabilities of the FLbb(RT) with 6,000-meter depth rating
  • FLbbB—The capabilities of the FLbb with internal batteries and memory for autonomous operation
  • FLbbS—The capabilities of the FLbb with an integrated anti-fouling Bio-wiper™
  • FLbbSB—The capabilities of the FLbb with internal batteries for autonomous operation
  • FLbb2k—Designed for float applications but can be use for applications down to 2000m
Customer Alert

ECO Pressure and Temperature Options Discontinued

Monday, August 10, 2015
August 2015 ECO TP Customer Alert.pdf
Customer Alert

WET Labs ECO Centroid Angles for Back Scatter Measurements

Tuesday, June 7, 2016
July2016ECOCentroidAnglesforBackScatterMeasurements_0.pdf
Product Datasheet

ECO FLbb datasheet

Monday, December 5, 2016
datasheet_ECO FLbb161205.pdf
Product Manual

ECO FLbb2k User Guide

Friday, June 1, 2012
FLBB2K-User-Guide-June2012.pdf
Product Manual

ECO user manual (DE)

Tuesday, February 2, 2016
WLECOMasterbde.pdf
Product Manual

ECO user manual (ES)

Tuesday, February 2, 2016
WLECOMasterbes.pdf
Product Manual

ECO user manual (FR)

Tuesday, February 2, 2016
WLECOMasterbfr.pdf
Technical Note

ECO Battery Life Calculator

Wednesday, February 22, 2017
ECOBatteryLifeCalculator.xls
Technical Note

ECO Calibration Log Template

Wednesday, February 22, 2017
ECOCalibrationLogTemplate.xlsx
Technical Note

Cable and Bulkhead Connector Maintenance

Thursday, March 9, 2017
Bulkhead-Connectors.pdf

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.

What is the back scattering angle of my ECO instrument?

The WET Labs’ ECO sensors have multiple back scattering angles depending upon type of sensor. This document will describe these angles based upon the type of ECO sensor selected by the customer. [PDF]