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1
Coastal Water Quality
Measure small changes with a sampling system
chris.goding@pentair.com
2
2
The Site
A buoy mounted nutrient analyzer
measuring seawater nutrient
concentrations near aquaculture farms
chris.goding@pentair.com
3
Deployment Technique Matters Most
Multiple intakes are used at multiple depths, exposed to
the rapidly growing tropical seawater conditions, while
the instrument is protected from fouling in the buoy
chris.goding@pentair.com
The proof is in the data
4
Using the same instrument for multiple depths gives
greater detail than using separate instruments at each
depth* * Applies regardless of the brand or manufacturer of the instrument
chris.goding@pentair.com
Instrument Accuracy
5
If separate instruments were used, it is impossible
to resolve differences to anything smaller than the
instrument accuracy
Instrument accuracy on NO2 with full
scale range of 1mg/L, specified to be
±5%, or 50 parts per billion (ppb).
chris.goding@pentair.com
Instrument Repeatability
6
When using the same instrument, clear and
repeatable differences become obvious
Clear and repeatable differences between
the three depths, resolvable to around
3ppb between middle & deep and a
further 5ppm between middle and shallow
chris.goding@pentair.com
7
50ppb
Resolve differences to the
instrument repeatability
rather than the absolute
accuracy of the instrument
3ppb
chris.goding@pentair.com
Understand why
8
When being able to trust small differences, more
complicated processes can be understood
What appears to be
“noise” is actually
related to tidal cycles
As the tide
goes down,
nutrients
go up
chris.goding@pentair.com
9
9
Learn the complete picture
• The nearby aquaculture feeding practices were causing
elevated nutrient levels near the sea floor*
• The outgoing tide was flushing nutrients past the site
* Outcome that could not be understood unless a profiling sampling system was used instead of in-situ instruments
chris.goding@pentair.com
10
Coastal Water Quality
There are many other advantages in the way we deploy
coastal instruments. Email today to start the
conversation.
chris.goding@pentair.com

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Coastal Water Quality Monitoring System

  • 1. 1 Coastal Water Quality Measure small changes with a sampling system chris.goding@pentair.com
  • 2. 2 2 The Site A buoy mounted nutrient analyzer measuring seawater nutrient concentrations near aquaculture farms chris.goding@pentair.com
  • 3. 3 Deployment Technique Matters Most Multiple intakes are used at multiple depths, exposed to the rapidly growing tropical seawater conditions, while the instrument is protected from fouling in the buoy chris.goding@pentair.com
  • 4. The proof is in the data 4 Using the same instrument for multiple depths gives greater detail than using separate instruments at each depth* * Applies regardless of the brand or manufacturer of the instrument chris.goding@pentair.com
  • 5. Instrument Accuracy 5 If separate instruments were used, it is impossible to resolve differences to anything smaller than the instrument accuracy Instrument accuracy on NO2 with full scale range of 1mg/L, specified to be ±5%, or 50 parts per billion (ppb). chris.goding@pentair.com
  • 6. Instrument Repeatability 6 When using the same instrument, clear and repeatable differences become obvious Clear and repeatable differences between the three depths, resolvable to around 3ppb between middle & deep and a further 5ppm between middle and shallow chris.goding@pentair.com
  • 7. 7 50ppb Resolve differences to the instrument repeatability rather than the absolute accuracy of the instrument 3ppb chris.goding@pentair.com
  • 8. Understand why 8 When being able to trust small differences, more complicated processes can be understood What appears to be “noise” is actually related to tidal cycles As the tide goes down, nutrients go up chris.goding@pentair.com
  • 9. 9 9 Learn the complete picture • The nearby aquaculture feeding practices were causing elevated nutrient levels near the sea floor* • The outgoing tide was flushing nutrients past the site * Outcome that could not be understood unless a profiling sampling system was used instead of in-situ instruments chris.goding@pentair.com
  • 10. 10 Coastal Water Quality There are many other advantages in the way we deploy coastal instruments. Email today to start the conversation. chris.goding@pentair.com