Choosing a conductivity salinity logger part 2 of 2
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Choosing a Conductivity/Salinity Logger: 5 Important Considerations Part 2 of 2 1 HOBO ® onset ® 4/25/2012 ONSET COMPUTER 1 Paul Gannett Product Marketing Manager
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Part 2 of a two-part presentation detailing five important considerations when choosing a conductivity/salinity data logger, presented by Paul Gannett, Product Marketing Manager, Onset Computer Corporation, maker of HOBO Data loggers.
Transcript of Choosing a conductivity salinity logger part 2 of 2
Choosing a Conductivity/Salinity Logger: 5 Important Considerations
Part 2 of 2
1
HOBO®
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4/25/2012 ONSET COMPUTER 1
Paul Gannett Product Marketing Manager
Great for the initial deployment
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Easier for ongoing deployments
Choosing a Conductivity/Salinity Logger:
Deployment Considerations - Calibration
Lab Calibration vs Field Calibration
Lab calibration Field calibration
A waterproof data shuttle can provide easy and reliable data offload in wet environments
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Choosing a Conductivity/Salinity Logger:
Deployment Considerations – Data offload
• Accuracy
• Mounting
• Ease of deployment and data offload
• Software
• Cost of ownership
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Choosing a Conductivity/Salinity Logger: 5 Important Considerations
Look for software that makes it easy to configure your logger and analyze data
• Intuitive point-and-click configuration
• Multi-logger graphing and analysis
• Ability to format, annotate and save graphs
Consider ease of data integration
• Merging data from multiple loggers
• Data export – for use in other programs or databases
• Data import – for bringing in related data
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Choosing a Conductivity/Salinity Logger:
Software
Look for software that provides the conversion methods & accuracy you need
• Salinity calculated with Practical Salinity Scale 1978 (PSS-78) (2 to 42 ppt range)
• Specific conductance – there are several temperature compensation methods: – Linear compensation (%/C)
– Freshwater compensation EN27888
– Non-linear seawater compensation
• Ability to use field calibration readings, preferably from both the start and end of deployment to adjust for fouling.
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Choosing a Conductivity/Salinity Logger:
Software
• Accuracy
• Mounting
• Ease of deployment and data offload
• Software
• Cost of ownership
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Choosing a Conductivity/Salinity Logger: 5 Important Considerations
Think beyond the initial purchase price! • Look for a logger that will last many years
– Housing material – Delrin or Titanium for saltwater – stainless steel is good for freshwater, but corrodes in saltwater
– Non-contact sensors last longer than electrodes that are in contact with the water
• Regular sensor cleaning extends the logger’s life – look for one that is easy to clean
• Replacement batteries and sensor extends the life of your logger
• Using a waterproof shuttle avoids risking your laptop in the field
• Software that saves you time can reduce your cost:
– Easy logger configuration and data analysis
– Software that can compensate for fouling means you don’t have to go into the field as often
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Choosing a Conductivity/Salinity Logger:
Cost of Ownership
• Accuracy
• Mounting
• Ease of deployment and data offload
• Software
• Cost of ownership
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Recap of the 5 Important Considerations
• Records conductivity & temperature
• Durable Delrin® housing
• Non-contact sensor for long life
• Easy-to-clean sensor with Titanium Pentoxide coating
• Two models: – Freshwater range: $699
– Saltwater range: $750
• Optical interface for high-speed data offload in wet environments
• Compatible with HOBO Waterproof Shuttle for easy data retrieval
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Example: HOBO Conductivity/Salinity Logger
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• Uses field meter readings for calibration of conductivity data
• Start and end calibration points used to compensate for fouling
HOBOware Conductivity Assistant
• Calculates Salinity using PSS-78
• Calculates Specific Conductance with choice of temperature compensation methods: – Linear compensation
– Freshwater compensation: EN27888
– Seawater compensation based on PSS-78
• Intuitive point-and-click configuration
• Multi-logger graphing and analysis
• Ability to format, annotate and save graphs
• Merge data from multiple loggers
• Data export – for use in other programs or databases
• Data import – for bringing in related data
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HOBOware for graphing and analysis
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Questions?
Choosing a Conductivity/Salinity Logger: 5 Important Considerations
We will send an email with a link to this webinar Additional Resources at onsetcomp.com: - Detailed product information - White papers - Application notes - Webinars on using our software
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Contacting Onset
Product Application Specialists: Tel. 1-800-564-4377 [email protected]
4/25/2012 Onset Computer Corp – www.onsetcomp.com
Questions about this webinar: Paul Gannett Direct Tel: 508-743-3149 [email protected]
General Product Questions: Onset Technical Support: 8am – 8pm EST Monday – Friday 1-800-564-4377 / 508-759-9500 [email protected]
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Questions and Answers Thanks for attending!
Choosing a Conductivity/Salinity Logger: 5 Important Considerations
