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Third Party Selection Guide

Descriptions and links on this page are provided as a convenient information source to our customers. Sea-Bird recommends products listed on this page, only to the extent that they are known to be of good quality, and are electronically, mechanically, and functionally compatible with Sea-Bird  instruments and software (when used as suggested by Sea-Bird). Descriptions are current as of June 2020, but may be changed by the sensor manufacturer at any time.

For ordering  Third Party sensors from Sea-Bird, see Auxiliary Sensor Configuration.

The following types of sensors are compared below:

Fluorometers (also see Combination Sensors below)

Manufacturer Model # Measures Pumped? Output
Range 1
Seapoint Chlorophyll Chlorophyll   5, 15, 50, 150 ug/l 6000 m  
Rhodamine Rhodamine   5, 15, 50, 150 ug/l 6000 m  
Ultraviolet (CDOM)


  50, 150, 500, 1500 ug/l 6000 m  
Turner Cyclops-7 Chlorophyll
(with optional
flow through
50, 50, 500 ug/l 600 m  
1 Sea-Bird ECO ranges are adjustable with Sea-Bird setup cable and software; Seapoint and Turner ranges are adjustable with jumper cables.                                                    
2 Sea-Bird Bio-Wiper minimizes fouling in moored applications.

Turbidity Sensors (also see Combination Sensors below)

Manufacturer Model # Measurement
Type 1
Light Source Wavelength Output
Range 2
D&A OBS 3+ Backscatter 850 nm 250, 1000 NTU 1500 m  
D&A OBS 3+ Backscatter 850 nm 500, 2000 NTU 1500 m  
D&A OBS 3+ Backscatter 850 nm 1000, 4000 NTU 1500 m  
Seapoint Turbidity Meter Turbidity 880 nm 25, 125, 500 750 FTU 6000 m  
1 Measurement type:
  • Backscatter — A light source illuminates a water sample, and a photodetector converts radiated light to photocurrent; the amount of photocurrent depends mainly on the area of the illuminated particles, but also on particle size, shape, and reflectivity. The signal is processed, generating an output voltage related to NTUs.    
  • Seapoint Turbidity — Scattered light from suspended particles in the water is detected using dual 880 nm light sources and dual silicon photodiode detectors with visible light blocking filters. The sensor design confines the sensing volume to within 5 cm of the sensor windows.
  • Single-angle backscattering — Measures scattering at 117 degrees, the angle determined as a minimum convergence point for variations in the volume scattering function induced by suspended materials and water itself.

2 Campbell Scientific and Seapoint sensor ranges is adjustable with jumper cables.