RBR Duet | Compact Dual-Parameter Loggers

Investigate how oxygen availability changes with temperature and depth using RBR Duet D.ODO. Bringing these measurements together helps you compare conditions through the water column and follow changes in aquatic habitats over time.

Key features

• Records dissolved oxygen, temperature and pressure.
• Outputs oxygen concentration and percentage saturation.
• Oxygen measurement range of 0–1000µmol/L, calibrated over 0–500µmol/L.
• Oxygen sampling up to 1Hz, with standard, fast and slow sensor response options.
• Two AA batteries, with standard configurations for depths up to 1000m and deep variants up to 6000m.

Track changes in water clarity alongside depth with RBR Duet D.Tu. Combining optical turbidity measurements with pressure helps you investigate sediment movement and compare conditions at different points through the water column.

Key features

• Records turbidity and pressure.
• Turbidity calibrated range of 0–1000FTU.
• Measurement range of 0–1500FTU, with a non-linear response above 1000FTU.
• Turbidity detection limit of 0.005FTU.
• Two AA batteries, with standard configurations for depths up to 1000m and deep variants up to 6000m.

For higher turbidity levels, an optical backscatter channel offers a measurement range up to 20,000FTU. Its calibrated range is 1000–4000FTU, with a non-linear response below 500FTU and above 15,000FTU.

Explore how chlorophyll-a fluorescence varies with depth using RBR Duet D.chl-a. Recording fluorescence and pressure together helps you investigate phytoplankton distribution and compare changes through the water column.

Key features

• Records chlorophyll-a fluorescence and pressure.
• Chlorophyll-a measurement range of 0–500µg/L.
• Calibrated range of 0–50µg/L.
• Detection limit of 0.020µg/L.
• Two AA batteries, with standard configurations for depths up to 1000m and deep variants up to 6000m.

The chlorophyll-a calibrated range and detection limit are scaled for in vivo fluorescence response.

Track tidal water-level changes alongside temperature with RBR Duet T.D in its tide32 configuration. Averaging pressure readings over a chosen period reduces the influence of short-term fluctuations, helping you see the underlying tidal pattern.

Key features

• Records temperature and pressure, with tidal averaging.
• Pressure sampling up to 32Hz in tide mode.
• Adjustable averaging duration from one second to 24 hours.
• Adjustable averaging intervals from one second to 24 hours.
• Optional two-battery configuration for longer deployments.

A choice of pressure ranges lets you match the logger to your deployment depth and measurement needs.

Study wave conditions and short-lived events such as boat wakes with RBR Duet T.D in its wave32 configuration. Pressure measurements support analysis of wave height, period and energy, while temperature recording adds context to your dataset.

Key features

• Sampling up to 32Hz.
• Intermittent and continuous wave bursts.
• Configurable burst sizes from 512 to 32,768 samples, in powers of two.
• Tidal averaging included.
• Optional two-battery configuration for longer deployments.

Wave measurements are recommended in water shallower than 100m. We can help you choose a suitable pressure range and sampling schedule for your site.

Adapt your measurements as your project changes with RBR Duet D.x. An integrated pressure sensor records depth alongside a compatible exchangeable sensor, allowing you to change what you measure across deployments.

Key features

• Integrated pressure measurement with an exchangeable sensor connection.
• Compatible sensors include RBR Coda temperature, pressure, temperature and pressure, dissolved oxygen, turbidity and chlorophyll-a models, plus RBR Quadrante.
• Fast sampling options up to 32Hz, depending on the connected sensor.
• Two AA batteries.
• Titanium deep configurations available up to 6000m.

The deployment depth is limited by the housing, pressure sensor and connected sensor ratings.