Ocean and River Instruments

RINKO EC (ARO-EC) [new]

ARO-PR
■Description
Aquatic eddy covariance method is a powerful technique to measure benthic fluxes. The robust RINKO EC (model name: ARO-EC), as a new member of the RINKO series, is designed for aquatic eddy covariance measurements. 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. 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 the user. Berg et al. (2016)*, after a detailed evaluation, concluded that RINKO EC is a reliable alternative for aquatic eddy covariance measurements of oxygen fluxes and its high data quality allows for new opportunities for eddy covariance flux studies, including long-term deployments in rivers, streams, and marine environments.

*Berg, P., D. Koopmans, M. Huettel, H. Li, K. Mori, and A. West (2016). A new robust oxygen-temperature sensor for aquatic eddy covariance measurements. Limnology and Oceanography: Methods 14, 151 167.

Brochure Download

Specifications

Model name ARO-EC
Measurement principle DO Phosphorescence
Temperature Thermistor
Range DO Air saturation: 0 to 200%
(calibration range: 3 to 30 ℃)
Temperature -3 to 45 ℃ (calibration range: 3 to 31 ℃)
Repeatability DO Air saturation: 2% (1)
Accuracy Temperature ±0.02 ℃
Response time (90%)
(from air to water at 25 C)
DO < 0.5 s
Temperature < 0.5 s
DO sensing foil life-time 200 h in continuous operation
Signal output 0 to 5 V analog (2)
Pre-heat time 5 s
Power 9.6 to 24 VDC (12 VDC recommended)
Current drain
(at 12 VDC, typical)
< 20 mA
Material Housing: Titanium (grade 2)
Dimensions Φ 54 mm 340 mm (w/o connector)
Weight Approx. 0.6 kg in air, 0.3 kg in water
Depth rating 50 m
Connector AG306-HP (Impulse Technologies Inc.)

Note(1) 2-point (span/zero) calibration before each measurement is required to obtain accurate DO data.
Note(2) Temperature and DO data should be calculated from the output voltage by the equation described in the manual.

Drawing

Drawing


*All the specifications are subject to change without notice. Please contact us for more information.

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