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Auxiliary Sensor 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 2017, 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:

PAR sensors (light between 400 and 700 nm)

Manufacturer Model # Measurement
Type 1
Output
Type 2
Maximum
Depth
Comments
Biospherical QSP-2300L 4 pi Built-in log amplifier 2000 m LSG connector
QSP-2350L 4 pi Built-in log amplifier 2000 m MCBH connector
QCP-2300L Cosine Built-in log amplifier 2000 m LSG connector
QCP-2350L Cosine Built-in log amplifier 6350 m MCBH connector
QCP-2300L-HP Cosine Built-in log amplifier 10000 m XSG connector
QCP-2350L-HP Cosine Built-in log amplifier 10000 m BH connector
QSP-2200 (PD) 4 pi Requires log amplifier 2000 m LSG connector
QCP-2200 (PD) Cosine Requires log amplifier 2000 m LSG connector
1 Measurement Type:
  • 4 pi or Scalar or Spherical — Measures light independent of angle of incidence.
  • Cosine or Float — Measures downwelling irradiance (maximum response to light from directly overhead, no response to light coming directly from the side or below).

2 Output Type:

  • Built-in log amplifier — Connects directly to 0-5 V A/D channel on Sea-Bird CTD.
  • Requires log amplifier — Requires CTD configured with a built-in log amplifier, or Sea-Bird PN 90310 Log Amp Module. PN 90310 mounts on CTD or cage; PAR sensor connects to PN 90310, which connects to 0-5V A/D channel on CTD.

 

Fluorometers (also see Combination Sensors below)

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

Ultraviolet
(CDOM)

  50, 150, 500, 1500 ug/l 6000 m  
Turner Cyclops-7 Chlorophyll
(with optional
flow through
cap)
50, 50, 500 ug/l 600 m  
1 WET Labs ECO ranges are adjustable with WET Labs setup cable and software; Seapoint and Turner ranges are adjustable with jumper cables.
2 WET Labs 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
Maximum
Depth
Comments
Campbell
Scientific
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.