Service
Sales
Ask Us
WET Labs
Satlantic

ECO Puck

The puck is a miniature version of the popular Environmental Characterization Optics (ECO) series sensors built for OEM applications.

WET Labs manufactures a miniature version of the popular Environmental Characterization Optics (ECO) series sensors for OEM applications. ECO series sensors incorporate a common set of options with a single basic design. The puck™ version is specifically designed for applications where space and power requirements are critical. Pucks™ are ideal for a wide variety of applications, including AUVs, gliders, and profiling floats.

Available Configurations

Fluorometer (FL)
Single-wavelength measurement of your choice of chlorophyll-a, CDOM, phycocyanin, phycoerythrin, uranine (fluorescein), or rhodamine.

Combo Fluorometer-Turbidity Sensor (FLNTU)
Measures chlorophyll-a in µg/L and turbidity in NTU.

Single-wavelength Scattering Meter (BB)
Measures optical scattering at 124 degrees at your choice of 470, 532, or 650 nm wavelengths.

Triple-Measurement Meter (Triplet)
2 scattering & 1 fluorescence, 1 scattering & 2 fluorescence, or 3 fluorescence measurements—your choice.

 
ECO single channel backscattering instruments as built and calibrated have a physical centroid angle of 120°. The effective in-water centroid angle that accounts for the ECO backscattering sensor’s instrument specific weighting function is 124°. Our literature that refers to a backscattering angle of 117° for the instrument was incorrect.

MECHANICAL

Diameter 6.3 cm
Length 5 cm
Weight in air 0.28 kg
Weight in water 0.02 kg

 

ELECTRICAL

Digital output resolution 12 bit
RS-232 output 19200 baud
Connector Customer-defined
Input 7-15 VDC
Current, typical 80 mA
Sample rate to 8 Hz

 

ENVIRONMENTAL

Temperature range 0 to 30 deg C
Depth rating  600 m (std)
See equivalent meter specifications sheets for optics details.
The list below includes (as applicable) the current product brochure, manual, and quick guide; software manual(s); and application notes.

ECOView host software provides a graphical user interface that allows you to configure, collect, view, and upload data from a variety of ECO fluorometers.

Version 1.23 released April 9, 2013
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 .

 

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.

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?