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RBRsolo⁴ x, RBRduet⁴ D.x: exchangeable loggers

The RBR exchangeable instruments can integrate a selection of RBR serial sensors, such as dissolved oxygen, turbidity, and chlorophyll-a. Low power consumption, infinite memory, and ability to endure harsh conditions make the RBRsolo4 x |2x and RBRduet4 D.x |2x instruments a perfect choice for many oceanographic applications.

  • Infinite memory*
  • Swap any RBR sensor ‘on the go’
  • Any AA battery chemistry
  • Standard sampling up to 2Hz, and optionally up to 32Hz
  • USB-C download
  • Optional fast sampling, tide & wave

*not really, but we stopped counting at billions of samples

  • Available sensors:
  • RBRcoda Tuturbidity
  • RBRcoda chl-achlorophyll-a
  • RBRcoda T.ODOoptical dissolved oxygen
  • RBRcoda³ Ttemperature
  • RBRcoda³ Dpressure
  • RBRquadrantePAR, rad

Features & Configurations

long deployments

compact and lightweight

two aa batteries

UP TO 32Hz SAMPLING

USB-C download

INFINITE MEMORY*

*not really, but we stopped counting at billions

The RBRsolo4 x |2x and RBRduet4 D.x |2x are compact, lightweight exchangeable loggers designed for high-precision oceanographic measurements in demanding environments. It combines exceptional accuracy and resolution using any standard AA battery chemistry. Engineered for durability in harsh marine conditions, these instruments delivers reliable, long-term performance across a wide range of oceanographic applications.

Infinite storage capacity and reliable battery power facilitate long deployments with higher sampling rates. Downloads are quick with USB-C.

A dedicated holder makes it simple to replace desiccant before each deployment.

The calibration coefficients are stored with the instrument, and only one software tool, Ruskin, is required to operate it. Datasets can be read directly in Matlab, or exported to Excel, OceanDataView®, or text files.

Optional Configurations

 

| fast up to 32Hz sampling
| deep up to 10000m

Specifications

Physical
Storage Infinite memory*
Power Any 2x AA cell
Communication USB-C
Clock drift ±60 seconds/year
Housing Plastic or titanium
Depth rating Up to 1700m (plastic), up to 10000m (Ti)
Diameter ~25mm
Length

~305mm to 349mm (pl) ~319mm to 358mm (Ti)
Weight
 <219g in air, <40g in water (plastic)
  <520g in air, <340g in water (Ti)

*not really, but we stopped counting at billions of samples.

Temperature
Calibrated range* -5°C to 35°C
Initial accuracy ±0.002°C
Resolution <0.00005°C
Typical stability ±0.002°C/year
Time constant <1s standard, <0.1s |fast

*A wider temperature range is available on request. Contact RBR for more information.

Pressure
Calibrated range1 20 / 50 / 100 / 200 / 500 / 1000dbar (plastic)
  2000 / 6000 / 10000dbar (Ti)
Initial accuracy2 ±0.05% full scale
Resolution <0.001% full scale
Typical Stability ±0.05% full scale / year
Time constant <10ms

1Recommended depth for wave measurements is less than 50m.

2±0.01% full scale is available upon request. Contact RBR for more information.

Turbidity
Wavelength 880nm
Centroid angle 90°
Linearity, R 0.99
Initial accuracy 5%
Calibrated range 0 – 1000FTU
Measurement range* 0 – 1500FTU

*Response becomes non-linear above 1000FTU.

Turbidity (optical backscatter)
Wavelength 880nm
Centroid angle 135°
Linearity, R² 0.99
Initial accuracy 5%
Calibrated range 1000-4000FTU
Measurement range* 0 – 20000FTU
Detection limit 2.0FTU

* Response becomes non-linear below 500FTU and above 15000FTU.

Chlorophyll-a
Wavelength 470nm/695nm (excitation/emission)
Calibrated range* 0-50µg/L
Measurement range 0-500µg/L
Detection limit 0.02µg/L

* Scaled for the in vivo fluorescence response.

Optical
Linearity, R 0.99
Initial accuracy 5%


Oxygen
Calibrated range 0-500μM concentration
0 – 120% saturation
1.5°C to 30°C temperature
Initial accuracy Maximum of ±8μmol/L or ±5% | fast
Maximum of ±2μmol/L or ±1.5% standard
Maximum of ±2μmol/L or ±1.5% | slow
Resolution <1µmol/L (saturation 0.4%) | fast
<0.5μmol/L (saturation 0.2%) standard
<0.1μmol/L (saturation 0.04%) | slow
Time constant <1s | fast, <8s standard, <30s | slow
Sampling rates 24hr to 1Hz


Output values

  • Temperature (°C)
  • Dissolved O2 concentration (μmol/L)
  • Dissolved O2 concentration (salinity compensated, μmol/L)
  • Dissolved O2 saturation (%)
  • Dissolved O2 phase (°)

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