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Home / Products / Compact Loggers / RBRsolo⁴ T|deep and RBRduet⁴ T.D|deep

RBRsolo4 | deep and RBRduet4 | deep: abyssal loggers

Our most compact and highly durable loggers for deepwater applications.

  • Infinite memory*
  • Flexible measurement schedules
  • High accuracy
  • Any AA battery
  • USB-C download
  • Standard sampling up to 2Hz, and optionally up to 32Hz
  • Depths to 10000m
  • Long deployments
  • Compact and lightweight

*not really, but we stopped counting at billions.

  • RBRsolo⁴ Ttemperaure
  • RBRsolo⁴ Dpressure
  • RBRduet⁴ T.Dtemperature and pressure

Features & Configurations

DEPTHS UP TO 10000m

any AA battery

long deployments

UP TO 32Hz SAMPLING

USB-C download

Infinite memory*

*not really, but we stopped counting at billions

The RBRsolo³ T | deep, RBRsolo³ D | deep, and RBRduet³ T.D | deep in titanium are small but highly durable and designed to resist all forms of marine corrosion. Deployable to the bottom of the Marianas Trench, they provide exceptional accuracy and resolution with extremely low power consumption, enabling multi-year deployments using any standard AA battery chemistry. USB-C enables fast configuration and data download. Engineered for durability in harsh marine conditions, the |deep delivers reliable, long-term performance across a wide range of oceanographic applications. 

Paired with Ruskin software for intuitive setup and retrieval, these loggers are designed for exceptionally long deployments, using RBR’s latest ultra-low-power electronics to maximise endurance without compromising precision. Data are stored in RSK format and are accessible using RBR’s open Python and MATLAB toolboxes, enabling direct integration into workflows and automated processing pipelines. Ruskin provides Excel exports and publication-ready charts in PNG and PDF formats, ensuring straightforward reporting, analysis, and archiving.

Optional Configurations

 

| deep up to 2Hz sampling
| fast | deep up to 32Hz sampling
| deep | 2x double the power of our standard compact instruments

Specifications

Physical
Power Any AA cell
Communication USB-C
Storage Infinite memory*
Clock drift ±60 seconds/year
Depth rating up to 10000m
Diameter ~25mm
Length Varies per sensor
Weight (air) Varies per sensor
Weight (water) Varies per sensor

*not really, but we stopped counting at billions.

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.

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