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| Applications | |
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AQUAtracka
III is a compact, lightweight, submersible fluorimeter for the
detection of chlorophyll-a, dye tracing or turbidity. Two variants of the
instrument are available, both manufactured in titanium, and rated to
2000m and 6000m respectively. For deck and laboratory applications a flow
through cowling is available. This instrument can sense chemical
fluorescence or light scatter in the visible and near infrared (400 to
800nm). Versatility is achieved by the selection of appropriate optical
narrow bandpass filters to match the excitation and emission wavelengths
of the fluorophor, e.g., chlorophyll-a, rhodamine or fluorescein. It may
be configured as a nephelometer by using the same band pass filters for
both excitation and emission.
The AQUAtracka III uses a
rugged pulsed xenon light source which is not prone to sudden failure and
gives low power consumption with excellent detection limits. Similarly,
the photo-diode detector is virtually indestructible and provides
excellent calibration stability over long time intervals. A dual-beam ratiometric arrangement is used with a reference channel
monitoring the intensity of each flash, thus compensating for light source
ageing. The ratio of the signals from sample and reference channels is
computed and output as a logarithmically scaled analogue voltage to give
the wide, four decade range of the instrument.
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Table of specific determinands, excitation / emission wavelengths & performance. (Centre wavelength and bandwidth are quoted respectively e.g. 440/80). Note: Filter changes and sensitivity optimization are factory activities. |
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Fluorimeter |
Units |
Chlorophyll-a |
Rhodamine |
Fluoroscein |
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Excitation wavelengths : |
(nm) |
430/105 |
500/70 |
485/22 |
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Emission wavelengths : |
(nm) |
685/30 |
590/45 |
530/30 |
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Concentration Range : |
(µg/l) |
0.01 - 100 |
0.01 - 100 |
0.01 - 100 |
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Resolution : |
(µg/l) |
0.01 |
0.01 |
0.01 |
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Accuracy : |
(µg/l) |
±0.02 or 3% whichever the greater |
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- |
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Calibration Standard : |
- |
Chlorophyll-a |
Rhodamine |
Fluoroscein |
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NEPHELOMETER : |
Units |
Nephelometer |
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Excitation wavelengths : |
(nm) |
440/80* |
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Emission wavelengths : |
(nm) |
440/80* |
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Concentration Range : |
(FTU) |
0.01 - 100 or 0.02 - 200 |
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Resolution : |
(FTU) |
0.01 or 0.02 |
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Accuracy (0-10 FTU) : |
(FTU) |
±0.02 or 3% whichever the greater |
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Calibration Standard : |
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Formazine |
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* Other wavelengths available on request |
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COMMON SPECIFICATION |
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Light source : |
Xenon lamp |
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Life of source: |
108 flashes |
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Wavelength range : |
400 - 800nm |
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Detector : |
Photodiode |
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Optical filters : |
Wide range of filters available |
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Depth of operation : |
2000m and 6000m versions |
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Temperature range : |
-2 to +32ºC |
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SPECIFIC DETAILS |
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Output : |
0 to 4V; 1V per decade |
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Voltage: |
Nominal 12V (9-18V)DC |
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Power Consumption : |
3W nominal |
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Weight in air : |
5.5kg |
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Weight in water : |
3.5kg |
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Dimensions : |
405mm x 88mm diameter |
Options: Deck units, calibration equipment, software for data acquisition, processing and display
In view of our continual improvement, the designs and specifications of our products may vary from those described.
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Chelsea
Technologies Group |
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