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2 Sensors
An optical sensor must be kept clean to operate correctly. Ensure that the SWiFT is power down
before cleaning the sensor.
Use warm soapy water with a soft bristled brush to remove any light fouling
For heavy fouling use a solvent (e.g Isopropyl alcohol) and a soft bristled brush
Always rinse thoroughly after every use in clean, fresh water.
2.1 Fluorometers
2.1.1 Chlorophyll a
Excitation:
Detection:
Dynamic Range:
Instrument Detection limit:
Actual Detection limit:
Linearity:
Response Time:
* 3x SD in RO water
** calibrated against Chlorophyll a in acetone solution
2.1.2 Fluorescein (Uranine)
Excitation:
Detection:
Dynamic Range:
Instrument Detection limit:
Actual Detection limit:
Linearity:
Response Time:
* 3x SD in RO water
** Calibrated against Fluorescein solution
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Performance
470 nm
696 nm
0-800 µg/l
(pre SN 75100: 2 gain settings: 0-40 and 0-800 (software controlled))
0.025 µg/l*
0.025 µg /l**
2
0.99 R
0.03 to 2 sec
Performance
470 nm
545 nm
0-500 ppb
(pre SN 75100: 2 gain settings: 0-25 and 0-500 (software controlled))
<0.01 ppb*
0.03 ppb**
2
0.99 R
0.03 to 2 sec
Section 2 | Sensors
Page | 4
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