RBRmaestro | Multi-Channel Logger

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

  • Up to 13 sensors in custom configurations
  • Standard sampling up to 1Hz
  • Fast sampling available for profiling
  • ~30M readings standard; up to ~120M readings optional
  • Optional RS232 or RS485 serial communication for real-time operation

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 thirteen (CTD + 10) 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
  • 1 Hz maximum sampling rate
  • >30M measurements
  • Up to thirteen 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
  • 16 CR123A batteries
  • USB 2.0 download
  • Optional RS232 or RS485 serial communication allows real-time 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 RBRmaestro|fast (Profiling)

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

  • 6 or 12Hz 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)
|fast6 6Hz continuous sampling
|fast12 12Hz continuous sampling
Extended memory options ~60M or ~120M readings (total)


Power 16 CR123A 3V cells
Communication USB 2.0 or RS-232/485
Storage ~30M readings standard; up to ~120M optional
Clock accuracy ±60 seconds/year
Depth rating Up to 2,000m – sensor dependent
Diameter Configuration dependent
Length Configuration dependent
Weight (air) Configuration dependent
Weight (water) Configuration dependent
Sampling period 1s to 24h (moored)
|fast6 1-6Hz
|fast12 1-6Hz, 12Hz
Conductivity (up to 2,000m)
 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 / 1000/ 2000m (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.