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ECO NTU

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

Features

  • Unparalleled sensitivity of the ECO in an optical scattering measurement at 700 nm for determining turbidity.
  • Turbidity measurement data that is not affected by CDOM concentration, unlike instruments that attempt to measure turbidity by using blue wavelengths.
  • The option of analog output for easy integration into CTD packages.
  • Excellent precision, reliability and overall performance at a fraction of the cost and size of similar instruments.

MECHANICAL

Diameter 6.3 cm
Length

12.7 cm (standard) / 17.68 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

Wavelength 700 nm
Sensitivity

0-125 NTU: 0.02 NTU
0-1000 NTU: 0.12 NTU

Range, typical 0-125 NTU, 0-1000 NTU

 

ELECTRICAL

Digital output resolution 14 bit
RS-232 output 19200 baud
Analog output signal 0-5 V
Internal data logging optional
Internal batteries* optional
Connector MCBH-6-MP
Input 7-15 VDC
Current, typical 50 mA
Current, sleep 140µA
Data memory 108,000 samples
Sample rate to 8 Hz
Anti-fouling Bio-wiper™ optional
Current, Bio-wiper™ cycle 140 mA

 

ENVIRONMENTAL

Temperature range 0 to 30 deg C
Depth rating standard 600 m (standard)
Depth rating with wiper* 300 m
Depth rating deep

6000 m

  • NTU(RT)— Analog and RS-232 serial output. This unit operates continuously when power is supplied
  • NTU(RT)D—Provides the capabilities of the NTU(RT) with 6,000-meter depth rating
  • NTUB—The capabilities of the NTU with internal memory and batteries for autonomous operation
  • NTUS—The capabilities of the NTU with internal memory and integrated anti-fouling Bio-wiper™
  • NTUSB—The capabilities of the NTUS with internal batteries for autonomous operation

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

Specifications are subject to change without notice. See product data sheet under for a download of this information,

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
ECO NTU Datasheet Product Datasheet Tuesday, August 22, 2017 datasheet-ECO-NTU.pdf
AN105 Laboratory Experiments on Crude Oil Detection using ECO Fluorometers Application Notes Thursday, June 29, 2017 AN105 CrudeOilLabTestClientUpdate.pdf
AN103: ECO Battery Life Calculator Application Notes Friday, June 30, 2017 ECOBatteryLifeCalculator.xls_.zip
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
ECO with Batteries Drawing Product Drawing Tuesday, July 4, 2017 drawing-ECOwithBatteries.pdf
ECO Real-time Drawing Product Drawing Tuesday, July 4, 2017 drawing-ECO-Real-time.pdf
ECO Fluorometers and Scattering Sensors Manual [Spanish] Product Manual Thursday, July 6, 2017 manual-ECOMasterbes.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
AN102: Getting the Highest Resolution on your ECO Technical Note Thursday, June 29, 2017 GettingtheHighestResolutiononyourECO_v1.pdf
AN62: Calculating Calibration Coefficients for ECO-FL Fluorometer, ECO-NTU Turbidity Meter, and ECO-FL-NTU Fluorometer/Turbidity Meter Application Notes Saturday, May 14, 2011 appnote62May11.pdf
Version released July 5, 2017
ECOView123.exe for Windows 7/8/10


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?

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 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?