RBRtridente

The RBRtridente is an optical sensor with three channels, capable of making multiple fluorescence and backscatter or turbidity measurements simultaneously. A dry-bay variant, designed for vehicle integration applications, offers the same channel options as the standard, wet-bay version.

The RBRtridente uses multiple gains, allowing exposure to full sunlight. However, when exposed to high background ambient light, the resolution of some channels may decrease. For this reason, during deployments, orient the RBRtridente facing downwards as shown in Fig. 5. See Deployment for more details.

RBRconcerto³ C.T.D.ODO.TRI Horizontal
Fig. 5.    An RBRconcerto³ C.T.D.ODO.TRI with an RBRtridente clamped facing downwards

Optical

Parameter Value

Centroid angle

120°

Sensing volume

~1.3mL

Linearity, R2

0.99

Initial accuracy

5%

Chlorophyll a

Parameter Value

Channel wavelength
(excitation/emission)

470nm/695nm or
435nm/695nm

Calibrated range1

0-50µg/L

Measurement range

0-500μg/L

Detection limit1

0.010µg/L

1 Scaled for the in vivo fluorescence response.

fDOM1

Parameter Value

Channel wavelength
(excitation/emission)

365nm/450nm

Calibrated range

0-500ppb

Measurement range

0-1500ppb

Detection limit

0.030ppb

1 fDOM can be used as a proxy for cDOM.

Phycocyanin

Parameter Value

Channel wavelength
(excitation/emission)

590nm/654nm

Calibrated range

0-500µg/L

Measurement range

0-10000μg/L

Detection limit

0.200µg/L

Phycoerythrin

Parameter Value

Channel wavelength
(excitation/emission)

525nm/600nm

Calibrated range

0-6000µg/L

Measurement range

0-10000μg/L

Detection limit

2.0µg/L

Rhodamine

Parameter Value

Channel wavelength
(excitation/emission)

550nm/600nm

Calibrated range

0-1000µg/L

Measurement range

0-1000μg/L

Detection limit

0.015µg/L

Fluorescein

Parameter Value

Channel wavelength
(excitation/emission)

470nm/550nm

Calibrated range

0-500µg/L

Measurement range

0-1500μg/L

Detection limit

0.010µg/L

Backscatter

Parameter Value

Channel wavelength

470nm, 525nm, 650nm, or 700nm

Calibrated range1

0-0.05m-1sr-1

Measurement range

0-1.5m-1sr-1

Detection limit

1x10-6m-1sr-1

1 Response becomes non-linear above 0.05m-1sr-1.

Turbidity

Parameter Value

Channel wavelength

650nm or 700nm

Calibrated range1

0-500FTU

Measurement range

0-1500FTU

Detection limit

0.001FTU

1 Response becomes non-linear above 500FTU.

Physical

Parameter Value

Housing

Titanium

Diameter

63.3mm

Length

57mm, 93mm with connector
56mm with cap (dry-bay)

Weight

460g in air, 275g in water
250g in air, 50g in water (dry-bay)

Depth rating

6000m, 1250m (dry-bay)

Sampling rate

Up to 32Hz

Power

Parameter Value

Supply voltage

4.5V to 30V (12V nominal)

Power

20mJ/sample (4Hz or slower)
32mA(384mW) (8Hz or faster)

Sleep current

10μA