Section 2 | Sensors
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2023
–
Valeport Ltd
Page | 4
2
Sensors
An optical sensor must be kept clean to operate correctly. Ensure that the unit 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.
2.1
Fluorometers
2.1.1
Chlorophyll a
Performance
Excitation:
470 nm
Detection:
696 nm
Dynamic Range:
0-800 µg/l
(pre SN 75100: 2 gain settings: 0-40 and 0-800 (software controlled))
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
2.1.2
Fluorescein (Uranine)
Performance
Excitation:
470 nm
Detection:
545 nm
Dynamic Range:
0-500 ppb
(pre SN 75100: 2 gain settings: 0-25 and 0-500 (software controlled))
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
