Seapoint Chlorophyll Fluorometer

Seapoint Chlorophyll Fluorometer
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FEATURES
• Very low power requirements
Can be used in pumped or open deployments
Small size
6000 m depth capability
Good ambient light rejection
Linear output with chlorophyll concentration
Four programmable ranges
Low temperature coefficient
Low offset voltage does not require adjustment
Pin compatible with Seapoint Turbidity Meter and
Seapoint Rhodamine Fluorometer

Interfaces easily with data acquisition systems
Rugged, corrosion-free materials

APPLICATIONS
• Profiling, Moored, Towed, or In-Line Measurements
• Water Quality Monitoring
Biomass and Nutrient Studies
Environmental Stress Tolerances
Lake and Watershed monitoring
Ocean Science and Research
Aquaculture

Seapoint Chlorophyll Fluorometer

Seapoint Chlorophyll Fluorometer Top View


DESCRIPTION
The Seapoint Chlorophyll Fluorometer (SCF) is a high-performance, low power instrument for in situ measurements of chlorophyll. Its small size, very low power consumption, high sensitivity, wide dynamic range, 6000 meter depth capability, and open or pump-through sample volume options provide the power and flexibility to measure chlorophyll in a wide variety of conditions. The SCF uses modulated blue LED lamps and a blue excitation filter to excite chlorophyll. The fluorescent light emitted by the chlorophyll passes through a red emission filter and is detected by a silicon photodiode. The low level signal is then processed using synchronous demodulation circuitry which generates an output voltage proportional to chlorophyll concentration. The SCF may be operated with or without a pump. The sensing volume may be left open to the surrounding water, or, with the use of the supplied cap, can have water pumped through it. Two control lines allow the user to set the range to one of four options. These lines may be hardwired or microprocessor controlled to provide a suitable range and resolution for a given application. The sensor is easily interfaced with data acquisition packages; a 5 ft. pigtail is supplied. Custom configurations are available.

SPECIFICATIONS

• Power Requirements:
• Output
• Output Time Constant
Power-up Transient Period
Excitation Wavelength
Emission Wavelength
Sensing Volume
Minimum Detectable Level
Sensitivity/Range



• Temperature Coefficient
• Depth Capability
• Weight (dry)
• Operating Temperature
• Material
• Underwater Connector


8-20 VDC, 15mA avg., 27mA pk.
0-5.0 VDC
0.1 sec.
< 1 sec.
470 nm CWL, 30 nm FWHM
685 nm CWL, 30 nm FWHM
340 mm3

0.02 µg/l
Gain
30x
10x
3x
1x
Sensitivity, V/µg/l
1.0
0.33
0.1
0.033
Range, µg/l
5
15
50
150

< 0.2%/°C
6000 m (19,685 ft)
1000 g (2.2 lbs)
0°C to 65°C (32°F to 149°F)
Rigid polyurethane
Impulse AG-306/206 (others available on request)

DIMENSIONS
Schematic of Seapoint Chlorophyll Fluorometer