Ican See Algae In The Water But My Sensor Is Giving Low Readings . Why; What Is The Range And Resolution Of The Optical Probes - palintest Macro 900 Operation Manual

Macro 900 Operation Manual
25.3. I can see algae in the water but my sensor is giving low readings. Why?
Palintest Chlorophyll and Blue-Green Algae sensors are not designed to
measure floating macroscopic (visible to the naked eye) algae or plant material.
The sensors measure the fluorescence from the microscopic phytoplankton
suspended within the body of the water below the surface. Carpets of floating
algae are often seen on environmental water that has low subsurface
phytoplankton concentrations. In these circumstances, the fluorescent algae
sensors will return low readings.

25.4. What is the Range and Resolution of the Optical Probes?

Range
Resolution
Turbidity Repeatability
MLD
MLR
Range
Resolution
Chlorophyll Repeatability
MLD
MLR
Range
Phycocyanin
Resolution
(BGA-PC)
Repeatability
(Freshwater Blue
-Green Algae)
MLD
Phycoerythri
Range
n
Resolution
(BGA-PE)
Repeatability
(Marine Blue-
Green Algae)
MLD
Range
Rhodamine
Resolution
WT Dye Repeatability
MLD
MLR
Range
Fluorescein
Resolution
Dye
Repeatability
MLD
MLR
Range
Refined Oil
Resolution
Repeatability
MLD
Palintest Ltd reserves the right to change specifications without notice
Notes:
1. MLD (Minimum Level of Detection) is the minimum value the electrode is physically capable
of measuring.
2. MLR (Minimum Level of Repeatability) is the value below which optical electrode readings
© 2013 Palintest Ltd.
2 Auto-range scales: 0.0 99.9 NTU, 100 – 3000 NTU
(1)
(2)
(1)
(2)
(1)
(1)
(1)
(2)
(1)
(2)
(1)
www.palintest.com
0 – 3000 NTU
± 5% of reading
0.0 NTU
5.0 NTU
0 – 500 µg/L (ppb)
0.1 µg/L
± 5% of reading
(see note 3)
0.1µg/L
5 µg/L
0 – 300,000 cells/mL
1 cell/mL
± 10% of reading
(see note 3)
200 cells/mL
0 – 200,000 cells/mL
1 cell/mL
± 10% of reading
(see note 3)
400 cells/mL
0 – 500 µg/L (ppb)
0.1 µg/L
± 5% of reading
(see note 3)
0.1 µg/L
5 µg/L
0 – 500 µg/L (ppb)
0.1 µg/L
± 5% of reading
(see note 3)
0.1 µg/L
5 µg/L
0 – 10,000 µg/L (ppb) (Napthalene)
0.1 µg/L
± 10% of reading
(see note 3)
100 µg/L (Napthalene)
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