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Optical Dissolved Oxygen (DO) Sensor 
SBE 63

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SBE 63 Optical Dissolved Oxygen Sensor
SBE 63 sensor (titanium housing;
plastic housing for 600 m also available)
SBE 63 on Navis (Argo) float CTD



Due to increasing science demands, Sea-Bird developed an individually calibrated, high-accuracy, optical oxygen sensor to assist in critical hypoxia and ocean stoichiometric oxygen chemistry research. With this new sensor, a myriad of moored and float-based platforms can contribute significantly in these driving areas of importance. The SBE 63 sets the oxygen measurement standard for oceanographic research. Careful choices of materials and geometry are combined with superior electronics and calibration methodology to yield significant gains in performance.

Each SBE 63 is calibrated individually in a temperature-controlled bath. Bath temperatures are varied at each of 4 oxygen values, providing a comprehensive 24-point calibration. Two reference sensors in each bath are standardized against Winkler titrations. Response time tests are conducted on each sensor, using gas. Salinity and pressure impacts on sensor response are each checked at two separate points.

The SBE 63 is designed for use in a CTD's pumped flow path, providing optimum correlation with CTD measurements. The elapsed time between the CTD and associated oxygen measurement is easily quantified, and corrected for in post-processing. The plumbing's black tubing blocks light, reducing in-situ algal growth.


  • SBE 63's optional sensor mount plugs into the RS-232 auxiliary sensor connector of the 16plus V2, 16plus-IM V2, or 19plus V2 SeaCAT CTD. Configuration choices include SBE 63 with 600-meter plastic or 7000-meter titanium housing;SBE 63 sensor mount rated to 5000 or 7000 meters, with XSG or wet-pluggable MCBH connector.
  • SBE 63 with a 600-meter plastic or 7000-meter titanium housing can be integrated into an SBE 37 MicroCAT (IMP-ODO, SMP-ODO, or SIP-ODO).
  • On a Sea-Bird Navis float CTD or other Argo float CTD, the SBE 63 with 7000-meter titanium housing is physically integrated with the CTD. Electronic operation of the SBE 63 requires an RS-232 interface in the Argo float controller; this interface is included in the Navis float.


The SBE 63s luminescence decay time decreases non-linearly with increasing oxygen concentration. Because the phase delay between excited and emitted signals is shifted as a function of the ambient oxygen concentration, the phase delay is detected instead of the decay time. The signal is characterized by a modified Stern-Volmer equation as follows:

O2 (ml/L) = [ { (a0 + a1T + a2V2 ) / (b0 + b1V) - 1 } / Ksv ] [ SCorr ] [ PCorr ]

O2 is oxygen concentration (ml/L)
T is temperature output from SBE 63's thermistor in C
V is raw measured phase delay in volts =
φr / 39.457071
φr is raw measured phase delay data in

0, a1, a2, b0, b1 are calibration coefficients (Uchida et al, 2008)
Ksv is Stern-Volmer constant (with calibration coefficients c
0, c1, c2) (Demas et al, 1999)
SCorr is salinity correction function (with calibration coefficients SolB0, Sol
B1, SolB2, SolB3, SolC0)
Corr is pressure correction function (with calibration coefficient E)


SBE 63 sensor (weight in air) 600-m Plastic housing: 245 g 7000-m Titanium housing: 270 g
Optional sensor mount
for SeaCAT (weight in air)
5000-m Plastic mount: 190 g 7000-m Titanium mount: 545 g


SBE 63 sensor for integration with
CTD for Navis and other Argo floats


SBE 63 sensor
installed in sensor mount
for use with
RS-232 auxiliary sensor
channel on CTD

Note: Sensor mount is rated to 5000 m (plastic version) or 7000 m (titanium version); dimensions are identical.



Documentation -- manual, photos, technical papers, application notes, etc.

Sales Information -- options, accessories, cables, mount kits, spares, etc.

Software -- components of Seasoft V2

Links to Other Instruments of Interest

Specifications are subject to change without notice.

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