Fast optical DO sensors

5,1.2VHULHV,QFUHGLEO\IDVW'2PHDVXUHPHQWVIRUDQ\DTXDWLFHQYLURQPHQW\RINKO I / I D
RINKO II / II D

RINKO III
Fast response (90%: less than 1s in air)High accuracy
DO distribution at high spatial resolution
Continuous vertical data sampling at 0.5 m s¯¹

RINKO series

Fast optical DO sensors

From air to N2 gas

Dissolved oxygen [%]RINKO is a fast-response, high-accuracy, andhigh-resolu on dissolved oxygen (DO) sensor
based on phosphorescence principle. Compared tocommercial galvanic, clark-cell, and op cal DOsensors, RINKO has the fastest response me ofless than 1 s in air (90% response, typical). This
notable feature enables DO measurements with
con nuous DO profiling at high speed (~ 0.5 m s⁻¹)
and to acquire high resolu on DO distribu ons.

Time [s]Oxygensensing foil

Excita on light

Phosphorescence

Oxygen molecule

Dye molecule

Oxygen molecule (excited)

Dye molecule (excited)

The DO sensor is coated with photos mulable
phosphor (PSP) on the outside of thepressure-resistant acrylic op cal window,
measuring phosphorescence quenching phaseshi . The excita on blue LED pulse generates
a red phosphorescence pulse, which in turnhas an inverse correla on with the oxygen
par al pressure in the water. Since oxygen
molecules are not consumed in this process,there is NO need for s rring.

The 2-point calibra on compensates the me-dri of the sensing foil, ensuring reliable and accurate DO data. The method
consists in recalibra ng the DO sensor in two points using an air-bubbled water for DO 100% and a sodium sulfite solu on
for DO 0%.
Second calibra on (DO 0%)

First calibra on (DO 100%)

Air bubbling water

Span calibra on

Sodium sulfite solu on

Zero calibra on■ Sensor specifications
Product name
Model nameParameter
Principle

RINKO I / I D, RINKO II / II D, RINKO III
ARO-USB, ARO05/1/2/5-USB, ARO-CAR/CAD, ARO05/1/2/5-CAR/CAD, ARO-CAV
TemperatureDO
Phosphorescence
Thermistor

Range

Air satura on 0 to 200%

-3 to 45 °C

Resolu on

0.01 to 0.04%
Non-linearity ±2% of full scale(at 1 atm, 25 °C)

0.001 °C

Accuracy±0.02 °C

(ARO-CAV: 3 to 31 °C)(Others: 0 to 35 °C)

DepthSemiconductor
0 to 50 m (ARO05-USB/CAR/CAD)
0 to 100 m (ARO1-USB/CAR/CAD)
0 to 200 m (ARO2-USB/CAR/CAD)
0 to 500 m (ARO5-USB/CAR/CAD)Approx. 1/30,000 of full scale±0.3% of full scale

RINKO series

Fast optical DO sensors

RINKO I / I D
RINKO I (ARO-USB) is an autonomously deployable data logger. The instrument has various opera ng modes, oﬀering Ňexibility when carring out abservaons. The compact size containing the data logger and ba eries allows for beingeasily integrated on deﬃerent pla orms. RINKO I D (ARO05/1/2/5-USB)
has an addi onal depth sensor, allowing for measurements of DO ver cal distribu on.

RINKO II / II D
RINKO II (ARO-CAR/CAD) is a digital output model (wired). The instrument can be easily integrated on diﬀerent pla orms (e.g., gliders), since itworks with RS-232C (CAR) or RS-485 (CAD) communica on protocols andexternal power (12 – 24 VDC). RINKO II D (ARO05/1/2/5-CAR/CAD)
has an addi onal depth sensor, allowing for measurements of DO ver cal
distribu on. These two models can monitor DO concentra on in real me.

RINKO III
RINKO III (ARO-CAV) is an analog output model that works with anexternal 12 – 24 VDC power. The instrument seamlessly outputs the alalog
data with 0 – 5 V. RINKO III can be easily installed on various pla orms
with an Impulse connector. The instrument provides high accurate DO data
without limi ng proĮling speed.
Impulse connector AG306-HP

Photo by Dr. Uchida, RIGC JAMSTEC

RINKO on CTD-RMS

RINKO on GliderRINKO series

Fast optical DO sensors■ Instrument specifications
Product name
Model name
Measuring mode
Measuring interval
Burst sampling interval
Number of samples
Memory medium
Communica onAD converter
Ba eryCurrent drain
MaterialDimensions
WeightPressure ra ng

RINKO I
ARO-USBCon nuous mode, Burst mode
0.1 to 0.9 s (0.1 s increment), 1 to 600 s (1 s increment)
1 to 1,440 min
1 to 18,000
1 GB miniSD card
USB 2.0 (ver. 1.1 compa ble)
16 bit digital conversion
CR-V3 3.3Ah Lithium ba ery / max 2 pieces
125 mA
Titanium (Ti-6AI-4V)
Φ54 × 235.5 mm
Approx. 0.9 kg in air, 0.6 kg in water
7,000 m depth equivalent

Product name
Model nameSignal output
Communica onAD converter
PowerCurrent drain
Material
Dimensions
WeightPressure ra ng
Connector

RINKO II
ARO-CAR/CAD
CAR: RS-232C, CAD: RS-485
Handshake
16 bit digital conversion
12 to 24 VDC
35 mA
Titanium (grade 2)
Φ54 × 184 mm (w/o connector)
Approx. 0.5 kg in air, 0.3 kg in water
1,000 m depth equivalent
LEMO or fixed type

RINKO ID
ARO05/1/2/5-USB

CR-V3 3.3Ah Lithium ba ery / max 4 pieces
130 mA
Titanium (grade 2)
Φ70 × 232 mm
Approx. 1.2 kg in air, 0.6 kg in water
Depends on the pressure sensor ra ng

RINKO IID
ARO05/1/2/5-CAR/CAD

Φ70 × 173 mm (w/o connector)
Approx. 1.0 kg in air, 0.5 kg in water
Depends on the pressure sensor ra ng

RINKO III
ARO-CAV
0 to 5 V analog――

Titanium (Ti-6AI-4V)
Φ54 × 164.5 mm (w/o connector)
Approx. 0.8 kg in air, 0.5 kg in water
7,000 m depth equivalent
AG306-HP (Impulse Technologies, Inc.)■ DrawingsDO

RINKO I

Temperature

RINKO II
Fixed type connector

AG206-FSD

RINKO III

AG306-HP

Dimensions are in mm.

※ All speciﬁcations on this leaﬂet are subject to change without notice.

Ocean & River Instruments Division
URL: http://www.jfe-advantech.co.jp/
Head Oﬃce
Tokyo Head Oﬃce
Tohoku Sales Oﬃce

3-48 Takahata cho, Nishinomiya, Hyogo 663-8202
FAX. +81-798-66-1654
TEL. +81-798-66-1783
JFE Kuramae Bldg. 2F, 2-17-4 Kuramae, Taito ku, Tokyo 111-0051
FAX. +81-3-5825-5591
TEL. +81-3-5825-5589
TM Bldg. 2F, 1-3-1, Ichiban cho, Aoba ku, Sendai, Miyagi 980-0811
FAX. +81-22-711-7534
TEL. +81-22-711-7535

2016.08