Features

• <1-second response
• Fast response in cold water
  
• 0.01% resolution
•  ± 2% accuracy
• 7000m rated
  

Fast response, high accuracy and high resolution 

Compared with other manufactures’ sensors (galvanic, Clark-cell and optical), RINKO has the fastest response time of any DO sensor. The 90% response time is <1 second. The resolution is 0.01% (at the low concentration) and the accuracy is ± 2% (at 1 atm., 25°C), the highest levels of in the commercially available oceanographic oxygen sensors. The RINKO sensor is available as an autonomously deployable data logger, RINKO-I, and as an analog output sensor,  RINKO-III, which can be integrated easily with third party platforms, such as CTD, AUV, ocean glider, etc. Both models provide profiling of oxygen concentration gradients with the sub-meter resolution to the full ocean depth (7000m).

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Oxygen section along WOCE line P21

JAMSTEC scientists Dr. Hiroshi Uchida and his team completed a successful CTDO₂ profiling mission with RINKO-III along WOCE standard line in Southern Pacific (WHP P21) on the R/V Mirai (MR09-01). They profiled at 257 stations for 65 days from April 10th to June 20th, 2009.

The RINKO's high-speed response ¹ (<1 sec., 90 % response) allowed them to obtain O₂ profiles with high spatial resolution. With the in-situ calibration using Winkler-titration samples^2,3,4,  RINKO provided highly accurate O₂ data. The standard deviations of the difference between RINKO oxygen readings and bottle oxygen samples were 1.1 micro-mol/kg (< 950 dbar) and 0.3 micro-mol/kg (> 950 dbar) each⁵.

Further information

1. Uchida et al. (2010), Blue earth '10 abstract .
2. Uchida et al. (2008), J. Atmos. Oceanic Technol., 25, 2271-2281.
3. Uchida (2009), Update of CTD oxygen data for the cruises MR07-04 and MR07-06.
4. Uchida et al. (2010), CTD oxygen sensor calibration procedures.
5. Murata et al. (2009), R/V Mirai Cruise Report, MR09-01.