Valeport SWiFT - 3.5 Optical Sensors

Sensors
© 2021 – Valeport Ltd
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3.5 Optical Sensors
An optical sensor must be kept clean to operate correctly. Ensure that the SWiFT plus is powered
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.
3.5.1 Fluorometers
3.5.1.1 Safety Statement
A Valeport Fluorometer is classified as Risk Group 1 under standard 62471. As the type is
classified as Risk Group 1 solely due to radiation in the visible band a hazard label is not required.
However,
• the LED used is in excess of the Exempt Group and that the viewer-related risk is
dependent upon how the user installs and operates the equipment.
• The exposure hazard value (EHV) for a Valeport Fluorometer in terms of distance is
320mm.
Never look directly into the optical aperture
3.5.1.2 Chlorophyll a
Performance
Excitation:
470 nm
Detection:
696 nm
Dynamic Range:
0 - 800 µg/l
Instrument Detection limit:
0.025 µg/l*
Actual Detection limit:
0.025 µg /l**
Linearity:
0.99 R
2
Response Time:
0.03 to 2 sec
* 3x SD in RO water
** calibrated against Chlorophyll a in acetone solution
3.5.1.3 Fluorescein
Performance
Excitation:
470 nm
Detection:
545 nm
Dynamic Range:
0 - 500 ppb
Instrument Detection limit:
<0.01 ppb*
Actual Detection limit:
0.03 ppb**
Linearity:
0.99 R
2
Response Time:
0.03 to 2 sec
* 3x SD in RO water
** Calibrated against Fluorescein solution