RBRmaestro³ | Multi-Channel Logger

Our most flexible, option-packed, multi-channel logger.

  • 240M readings
  • Up to 16Hz sampling
  • USB-C download
  • Twist activation
  • Wi-Fi ready
  • Supports 3 to 10 channel combinations
  • Realtime communication with USB, RS-232, or RS-485

Available Sensors:
Conductivity, Temperature, Pressure (Depth), Dissolved Oxygen, Fluorescence, Nitrate, ORP, PAR, pH, Transmissance, Turbidity, Voltage, Water Sampler

RBR’s multi-parameter, multi-channel loggers are designed to provide you with the flexibility to select the right combination of sensors for your water quality measurements. The choice of up to ten sensors can be integrated with the logger. The loggers are available in two configurations: one for autonomous deployment and one for water column profiling. The recorders can be equipped with data and power connections to facilitate remote access or remote data acquisition. There are a number of different sensors that can be used with the recorders, for example: Conductivity, Temperature, Depth, pH, ORP (RedOx), Dissolved Oxygen, Fluorescence, Turbidity, Transmittance, PAR, and others.

  • Submersible, autonomous 24-bit data logger
  • 16Hz maximum sampling rate
  • 240M readings
  • Up to ten sensors in custom configurations can be integrated
  • Sensors include, Conductivity, Temperature, Depth (Pressure), pH, ORP(RedOx), Dissolved Oxygen, Fluorescence, Turbidity, Transmittance, PAR, and many others in any combination
  • C, T, D and DO are measured to WOCE standards
  • All calibration constants are stored in the logger
  • Re-calibration of many sensors may be carried out by the end-user under suitable conditions
  • 8 AA cells
  • USB-C download
  • Optional RS-232 or RS-485 serial communication allows realtime operation over long cable links using the Ruskin application
  • Mooring clamps and cages are optional and rugged transit cases are recommended
  • Deep and shallow water versions
Features of the RBRmaestro³|fast (Profiling)

The |fast profiling version of the RBRconcerto logger includes all of the above features, plus:

  • 8 or 16Hz maximum sampling rate options
  • Averaging
  • Thresholding capability (logger only samples while submerged or under specific conditions)
  • and optionally, a fast response dissolved oxygen sensor (Response: approximately 1 sec for 63% at 25°C)
|fast8 or |fast16 sampling for profiling
Wi-Fi communication
External data and power connector with USB, RS-232, or RS-485


Power 8 AA cells
Communication USB-C or RS-232/485
Storage 240M readings
Clock drift ±60 seconds/year
Depth rating Up to 10,000m – sensor dependent
Diameter Configuration dependent
Length Configuration dependent
Weight (air) Configuration dependent
Weight (water) Configuration dependent
Sampling period 1s to 24h (moored)
|fast8 1, 2, 4, 8Hz
|fast16 1, 2, 4, 8, 16Hz
Conductivity (up to 6,000m)
 Calibrated measurement range:  0-85mS/cm. PSS-78 is defined up to 70μS/cm. Extended ranges are available.
 Initial accuracy  ±0.003mS/cm
 Typical stability 10μS/cm/year
 Resolution ~1μS/cm
 Time constant  Set by flow through cell. Cell length is 40mm.
Range -5°C to 35°C
Initial accuracy ±0.002°C
Resolution <0.00005°C
Time constant ~1s (standard) or ~0.1s (optional)
Typical stability 0.002°C/year
Pressure (Depth)
Range 20 / 50 / 100 / 200 / 500 / 750 / 1000/ 2000 / 4000 / 6000 / 10,000m (dbar)
Initial accuracy ±0.05% full scale
Resolution <0.001% full scale
Time constant <0.01s
Typical Stability ~0.05%/year
Dissolved Oxygen (Oxyguard®)
Range 0 to 600%
Initial accuracy ±2% O2 saturation (5°C to 25°C)
Resolution 1% of saturation
Response Time ~10s, 90% step change at 20°C
Turbidity (Seapoint)
Light source 880nm
Time Constant 0.1s
Linearity <2% deviation 0-750 FTU
Fluorescence (Seapoint)
Excitation Various wavelengths
Time Constant 0.1s
Range 0.02μg/l to 150μg/l

Contact RBR for other sensor options.