RBRcoda chl-a

The RBRcoda chl-a (Fig. 9) is a 6000m capable realtime chlorophyll-a sensor designed to ensure sensitivity to low concentrations across the measurable range (0-500µg/L). Its compact form, fast sampling rates, low power consumption, and high depth rating make it well suited for use in a wide variety of applications. This dedicated chlorophyll-a fluorometer brings laboratory grade precision to the ocean environment while maintaining the ruggedness, reliability, and compact design required for field deployments.

All optical components of the RBRcoda chl-a are robust and durable, selected to minimise ageing due to UV/sunlight exposure, and thus show minimal change in properties over extended deployments. Its sapphire windows facilitate automated cleaning by a wiper to keep them free of biofouling during long-term moored deployments.

Deploy the RBRcoda chl-a with the detection window facing down and the connector end-cap pointing upwards to avoid unnecessary exposure to direct sunlight.

RBRcoda chl-a.2.png
Fig. 9.    The RBRcoda chl-a

Chlorophyll-a

Parameter Value

Wavelength

470nm/695nm (excitation/emission)

Calibrated range1

0-50µg/L

Measurement range

0-500µg/L

Detection limit1

0.020µg/L

1 Scaled for the in vivo fluorescence response.

Optical

Parameter Value

Linearity, R2

0.99

Initial accuracy

5%

Physical

Parameter Value

Connector

MCBH-6-MP

Communications

RS-232

Housing

Titanium

Depth rating

6000m

Diameter

25mm

Length

~68mm (~104mm with connector)

Weight

110g in air,

70g in water

Operating temperature range

-5°C to +35°C

Sampling rate

Up to 32Hz

Power

Parameter Value

Supply voltage

4.5V to 30V (12V nominal)

Power

6.5mJ/sample (4Hz or slower)

15mA (180mW) (8Hz or faster)

Sleep current

10µA

Calibration equation

Chlorophyll a

\[Chl_{(\mu g/L)}=(C_0+C_1*V_r)*C_2\]