Fast optical DO sensor for microscale measurements

Aquatic eddy covariance method is a powerful technique to measure benthic fluxes. The RINKO series is based on the optical (phosphorescence) principle which is now widely known as a remarkably fast response oxygen sensor with high accuracy. As a new member of the RINKO family, the robust RINKO EC (model name: ARO-EC-CM) is designed for aquatic eddy covariance measurements. The response time of the RINKO EC oxygen sensing foil is less than 0.5 s (90%, from air to water at 25 °C). The foil life-time is more than 200 h, which enables at least 1 week of continuous measurements of dissolved oxygen. Moreover, the foil can be replaced easily by users. The RINKO EC is an advantageous tool for eddy covariance measurements in many aquatic environments

Relative paper

1. Berg P., Koopmans D. J., Huettel M., Li H., Mori K., Wüest A. (2016) A new robust oxygen-temperature sensor for aquatic eddy covariance measurements. Limnology and Oceanography Methods, 14, 151−167. DOI: 10.1002/lom3.10071
2. Berg, P. & Pace M. L. (2017) Continuous measurement of air–water gas exchange by underwater eddy covariance, Biogeosciences, 14, 5595 – 5606. DOI: 10.5194/bg-14-5595-2017
3. Plew D. R. (2019) Investigating benthic impacts at salmon farms using eddy covariance measurements of benthic oxygen fluxes. Aquaculture Environment Interactions, 11, 337 – 357. DOI: 10.3354/aei00317
4. Huettel M., Berg, P., Merikhi A. (2020) Technical note: Measurements and data analysis of sediment-water oxygen flux using a new dual-optode eddy covariance instrument, Biogeosciences Discussions. in review. DOI: 10.5194/bg-2020-172

Parameter	Temperature	Dissolved Oxygen
Range	-3~45℃	Air saturation: 0~200%
Repeatability	-	Air saturation: ±1%
Accuracy	±0.02℃	-
Response Time	90%: <0.5s (from air to water at 25℃)
Power Consumption	< 20 mA(at 12 VDC)