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ECO BB

The ECO BB measures scattering at 124 degrees, the angle determined as a minimum convergence point for variations in the volume scattering function (VSF) induced by suspended materials and water itself. As a result, the signal measured by this meter is less determined by the type and size of the materials in the water and is more directly correlated to the concentration of the materials.

WET Labs manufactures a line of optical tools for determination of bio-optical and physical parameters within natural waters. These instruments are designed as a modular suite of sensors with special features for specific application support. The Environmental Characterization Optics (ECO) series incorporates a common set of options with a single basic design to make the sensors ideal for a wide variety of deployments. Features include:

  • Compact size
  • Integrated self-logging
  • Configurable output
  • High precision and stability 
  • Optional Integrated anti-fouling
WET Labs, Inc. produces a single-angle sensor for determination of optical backscattering. Based upon recent work by Drs. Emmanuel Boss and Scott Pegau of Oregon State University*, the ECO BB measures scattering at 124 degrees. This angle was determined as a minimum convergence point for variations in the volume scattering function (VSF) induced by suspended materials and water itself. As a result, the signal measured by this meter is less determined by the type and size of the materials in the water, and is more directly correlated to the concentration of the materials. Conversely, the meter provides unparalleled accuracy, for any single-angle measurement, in determining the optical backscattering coefficient—an important parameter for remote sensing and in-water bio-optical applications.

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

MECHANICAL

Diameter

6.3 cm (std)
Length 12.7 cm (std)
Length 17.68 (deep)
Weight in air 0.4 kg (std)
Weight in air 1.3 kg (deep)
Weight in water 0.02 kg (std)
Weight in water 0.75 kg (deep)
Pressure housing Acetal copolymer (std)
Pressure housing Titanium (deep)

OPTICAL

Wavelength Options 470, 532 or 650 nm
  *Other wavelengths available upon request
Sensitivity, 470 0.003 m-1
Sensitivity, 532 0.003 m-1
Sensitivity, 650 0.003 m-1
Range ~ 0-5 m-1
Linearity 99% R2

ELECTRICAL

Digital output resolution 12 bit
RS-232 output 19200 baud
Analog outpout signal 0-5 V
Internal data logging

optional

Internal batteries optional
Connector MCBH6MP
Input 7-15 VDC
Current, typical 50 mA
Current, sleep 140 µA
Data memory 108,000 samples
Sample rate to 8 Hz
Anti-fouling Bio-wiper™ optional
Bio-wiper™ cycle 140 mA

ENVIRONMENTAL

Temperature range 0-30 deg C
Depth rating 600 m (standard)
Depth rating* 300 m (with optional bio-wiper)
Depth rating 6000 m (deep)

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

 

The list below includes (as applicable) the current product brochure, manual, and quick guide; software manual(s); and application notes.

Title Type Publication Date PDF File
AN103: ECO Battery Life Calculator Application Notes Friday, June 30, 2017 ECOBatteryLifeCalculator.xls_.zip
AN109 Notice of Clarification of ECO bb angle nomenclature Application Notes Tuesday, July 4, 2017 AN109-Notice of Clarification of ECO bb angle nomenclature.pdf
AN114 ECO Centroid Angles for Back Scatter Measurements Application Notes Tuesday, July 4, 2017 AN114-ECOCentroidAnglesforBackScatterMeasurements.pdf
AN122 ECO Calibration Log Template Application Notes Wednesday, July 5, 2017 AN122 ECOCalibrationLogTemplate.xlsx_.zip
Navis Profiling Float Product Guide - Feature Comparisons Product Brochure Thursday, November 26, 2015 NavisProductGuideAPR2016.pdf
ECO bb Datasheet Product Datasheet Tuesday, July 4, 2017 datasheet-ECO-BB.pdf
ECO with Batteries Drawing Product Drawing Tuesday, July 4, 2017 drawing-ECOwithBatteries.pdf
ECO Fluorometers and Scattering Sensors Manual [French] Product Manual Thursday, July 6, 2017 manual-ECOMasterbfr.pdf
ECO Fluorometers and Scattering Sensors Manual [German] Product Manual Thursday, July 6, 2017 manual-ECOMasterbde.pdf
ECO Fluorometers and Scattering Sensors Manual [English] Product Manual Thursday, July 6, 2017 manual-ECOMasterben.pdf
ECO Fluorometers and Scattering Sensors Manual [Spanish] Product Manual Thursday, July 6, 2017 manual-ECOMasterbes.pdf
AN102: Getting the Highest Resolution on your ECO Technical Note Thursday, June 29, 2017 GettingtheHighestResolutiononyourECO_v1.pdf
AN87: Calculating Calibration Coefficients for ECO-BB Scattering/Turbidity Meter (voltage or RS-232 output sensor) Application Notes Wednesday, May 11, 2011 appnote87May11.pdf
Version released July 5, 2017
ECOView123.exe for Windows 7/8/10


Deriving the vertical diffuse attenuation coefficient (Kd) from the absorption coefficient (a).


Derivation of Kd from a
In what follows we have left off the dependence on wavelength. In addition we have left off effects due to inelastic scattering.
 
Modeling Kd(z) requires the inclusion of the depth dependence of the shape of the radiance
distribution. This can be accomplished by using Gershun's equation:
K(z) = a(z) / μ − (z)
 
where a(z) is the absorption coefficient and μ(z) is the average cosine of the light field.
Kd(z) differs from K(z) by only a few percent, so that we may set:
Kd(z) ≈ a(z) / μ − (z) .
 
Berwald et al. (1995) have derived a parametric model for the dependence of ⎯μ(z) on ωo for a vertical sun in a black sky. We will assume the same depth dependence for an ordinary sky. This is not precise, but the average cosine varies slowly and has a typical range of only about 10%. The model is:
 
ωo= b / c, where b and c are the total scattering and attenuation coefficients, including water.
τ = cz, is the optical depth.
μ∞(τ) = μ∞ + (μ(0) - μ∞ ) exp(-Ptt ).
μ∞ = - 1.59 ωo4 + 1.71 ωo3 - 0.467 ωo2 - 0.347 ωo + 1
μ(0)= cosine of refracted solar zenith angle
Pτ(ωo) = - 0.166 ωo2 + 0.341 ωo + 0.0305
 
Berwald et. al. Limnology and Oceanography 1995, vol. 40, no8, pp. 1347-1357 .

 

How do I protect my ECO from bio-fouling?

ECO instruments are designed for long term deployment capabilities with low power requirements, a large memory and an available Bio-wiper™. The Bio-wiper™ on the ECO was designed to protect the optical surface and has been very effective under most conditions.

If extra protection is required to prevent marine organisms from attaching to the instrument body near the optical head and interfering with the operation of the Bio-wiper™ we suggest using copper foil tape. The GoMOOS project developed a technique for their ECO sensors and WET Labs recommends this technique:

Apply electrical tape under the area where copper tape will be applied. This protects the meter from the significant adhesive residue of the copper foil tape.

Apply the copper tape to the prepped surfaces. There are different width copper foil tape options, with non-conductive adhesive, available from McMaster-Carr. NOTE: when applying the coper tape, the adhesive should not be touched. This will cause the tape to not stick to the electrical tape on the meter. When submerged in salt water, the copper will adhere more closely to the meter.

As long as the electrical tape is used, this technique does not violate the ECO warranty and WET Labs will service instruments that have had copper tape applied to them.

Important! Do NOT apply copper tape directly to the meter. Its adhesive is extremely difficult to remove. Meters returned to WET Labs wrapped in copper tape without the electrical tape preparation will have additional service charges applied.

 

What is the fluorescent stick that came with my meter used for?

Checking Meter Output with the Fluorescent Stick
ECO meters ship with a stick of fluorescent material with which you can check your meter's output response.
    •    With the meter on and outputting data, hold the stick approximately 1/2-in (1 cm) from the lit detectors. Be careful to NOT touch the sensor face, as it scratches easily.
    •    Pivot the stick to parallel with the meter's optics; the output in the  meter's "signal" column should increase to near maximum output as given on the meter's characterization or calibration sheet.
    •    As you move the stick away, the output will decrease.

 

What is the memory capability?

    •    Not included on the "RT" units!!
    •    The memory is stored in "Flash" memory, an integrated circuit chip on the electronic board set.
    •    There is no removable card, no upgrade in memory capacity.
    •    The total sample records available for a single channel ECO = 108,000.
    •    Typically, the ECO output is set to 1 sample/sec.

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 type of batteries are in ECO's?


    •    We recommend the use of Lithium batteries in all of our ECO battery units.
    •    There is a very significant battery life increase in comparison with Alkaline cells.
    •    We use Ultralife Lithium +9V batteries.
    •    Ultralife has 3 different part numbers (used with different sales packaging) for the long-life batteries we use in our ECO's:
    ◦    U9VL
    ◦    U9VLX
    ◦    U9VLBP
    •    Ultralife batteries have Aluminum/Mylar housing providing:
    ◦    Protection against humidity and heat from entering the battery. Humidity and heat reduce efficiency and shelf-life.
    ◦    Batteries that are much more leak-resistant.
    •    Ultralife batteries have a 7-10 year shelf-life.
    •    The batteries are customer replaceable with easy access to the battery pack.
    •    The battery pack has 6 batteries: 2 layers of 3 +9V Lithium cells.

 

How do I get started using my new ECO?

How do I change the ASV resolution?

How do I change the ASV resolution?

See the following Technical Note: Getting the Highest Resolution on your ECO_v1 [PDF]

What is the back scattering angle of my ECO instrument?

WET Labs ECO Centroid Angles for Back Scatter Measurements

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.

Single Channel Sensors:
Single channel ECO back scatter sensors have an in-water centroid angle of 124°.  These include the following ECO models: bb, NTU.

Dual Channel Sensors:
Dual channel ECO back scatter sensors (back scatter at 700nm paired with chlorophyll fluorescence) have an in-water centroid angle of 142°. These include the following ECO models: FLNTU and FLBB versions along with OEM variants of these sensors (AP2, 2K, SLC, RTD, SB variants).

Three Channel Sensors:
Three channel ECO back scatter sensors (individually paired LED source with detector) have an in-water centroid angle of 124°. These include the following ECO models: bb3, BBFL2, BB2FL and Triplet-w family.

Combined Three Channel Sensors:
WET Labs’ combined three channel ECO back scatter sensors (back scatter at 700nm paired with chlorophyll fluorescence along with either another back scatter or FDOM channel) have an in-water centroid angle of 124°.

These include the following ECO models:
FLBB-CD, FLBB-BB along with OEM variants of these sensors (2K, AP2, SLC, REM, BOSS, 6K). MCOMS and SeaOWL UV-A: WET Labs’ MCOMS and SeaOWL UV-A back scatter sensors (back scatter at 700nm paired with chlorophyll fluorescence along with either another back scatter or FDOM channel) have an in-water centroid angle of 150°.

What is the input voltage range for my instrument?