RBRquadrante

The RBRquadrante is a four-channel radiometer, capable of measuring multiple wavebands simultaneously, including PAR. It leverages the same optical design and components as our RBRcoda single-channel radiometers and PAR sensors. During deployments, orient the RBRquadrante facing upwards to the surface as shown in Fig. 4.

RBRconcerto³ C.T.D.ODO.quad - ISO - 1.png
Fig. 4.    An RBRconcerto³ C.T.D.ODO.QUAD with an RBRquadrante clamped facing upwards

Optical radiometry

Parameter Value

Dynamic range

>5.5 decades (nominal)

Initial accuracy1

±2%

Linearity

±1%

Operating temperature range

-5°C to 35°C

Cosine response error (water)

±5% at 0-60°C , ±10% at 61-82°C

Azimuth error (water)

±1.5% at 45°C

Out-of-band rejection2

>25dB (typical), OD 2.5

1 RBR calibrates radiometers with NIST traceable references.

2 Out-of-band rejection is wavelength-dependent for narrow-band radiometers.

PAR

Parameter Value

Wavelength range

400nm to 700nm

Full scale range

0 to 5000µmol/m²/s (minimum)

Resolution

±0.010µmol/m²/s

Narrow-band channels

Parameter Value

Centre wavelengths (CWL)1

380 / 413 / 445 / 475 / 488 / 508 / 532 / 560nm

Full width at half-maximum (FWHM)

10nm (25nm for CWL 475nm)

Full scale range

0 to ≥200µW/cm²/nm (full sun)

Resolution2

±0.001µW/cm²/nm

1 Other CWL options within the 300-1100nm range are available upon request. Contact RBR for more information.

2 Resolution is wavelength-dependent for narrow-band radiometers.

Dark offset is internally temperature-compensated.

Physical

Parameter Value

Housing

Titanium

Diameter

63.3mm

Length

57mm, 93mm (with connector)

Weight

435g (in air), 250g (in water)

Depth rating

Up to 2000m

Sampling rate

Up to 32Hz

Power

Parameter Value

Supply voltage

4.5V to 30V (12V nominal)

Power

4mJ per sample (4Hz or slower)
3mA(36mW) (8Hz or faster)

Sleep current

10μA