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Water quality parameters are monitoring using in-situ probes. The probes connected to multiprobe sondes. The probes measure selected parameters, converting these measures in electrical singles that are processed by the sonde. Data are then sent up a cable that is connected to the computer contained with the buoy’s hull.
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YSI 6600 Sonde
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Hydrolab DataSonde 4a
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Wetlab Transmissometer
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Both YSI 6600 and Hydrolab Datasonde 4a sondes are being utilized by this project.
Refer to the tables below (the upper table refers to the YSI 6600 probes, while the lower table refers to the Hydrolab Datasonde 4a) to obtain the model number, sensor type, range, accuracy and resolution of the various probes.
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YSI 6600: Otisco Lake and Lake George and Skaneateles Lake (2002 only)
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Parameter
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Model number
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Sensor Type
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Range
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Accuracy
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Resoluti on
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depth
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integrated
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Strain gauge
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0 to 61 m
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± 0.12 m
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0.001 m
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water temperature
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6560
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thermistor
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-5 to 45 ºC
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±0.15 ºC
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0.01 ºC
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specific conductance
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4 electrode cell with autoranging
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0 to 100 mS/cm
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±0.5% of reading or 1 uS/cm
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1 uS/cm
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dissolved oxygen
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6562
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Rapid Pulse, Clark type, polarographic
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0 to 50 mg/L
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±2% of reading or 0.2 mg/L
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0.01 mg/L
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pH
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6565
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Glass combination electrode
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0 to 14 units
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±0.2 units
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0.01 units
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redox potential
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Platinum button
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-999 to 999 mV
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±20 mV
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0.1 mV
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turbidity
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6026
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Optical, 90º scatter with wiper
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0 to 1000 NTU
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±5% of reading or 2 NTU
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0.1 NTU
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chlorophyll
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6025
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Optical fluorescence with wiper
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0 to 400 ug/L
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manufacture doesn’t report
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0.1 ug/L
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Hydrolab Datasonde 4a Skaneateles Lake (2003)
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Parameter
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Model number
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Sensor Type
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Range
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Accuracy
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Resoluti on
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depth
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integrated
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Strain gauge
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0 to 100 m
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± 0.3m
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0.1 m
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water temperature
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thermistor
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-5 to 50 ºC
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±0.1 ºC
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0.01 ºC
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specific conductance
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4 electrode cell with autoranging
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0 to 100 mS/cm
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±0.5% of reading or 1 uS/cm
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1 uS/cm
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turbidity
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Optical, 90º scatter with shutter
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0 to 100 NTU
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±2.6% of reading or 2 NTU
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0.1 NTU
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transmissometry
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Wetlabs
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660 nm 25 cm pathlength
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0 to 100%
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0.2%
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0.1%
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