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.
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Choosing a conductivity salinity logger part 2 of 2
1. onset ®
Choosing a Conductivity/Salinity Logger:
5 Important Considerations
Part 2 of 2
Paul Gannett
Product Marketing Manager
HOBO
®
4/25/2012 ONSET COMPUTER 1 1
2. onset ®
Choosing a Conductivity/Salinity Logger:
Deployment Considerations - Calibration
Lab Calibration vs Field Calibration
Lab calibration Field calibration
Great for the initial deployment Easier for ongoing deployments
HOBO
®
4/25/2012 ONSET COMPUTER 2
3. onset ®
Choosing a Conductivity/Salinity Logger:
Deployment Considerations – Data offload
A waterproof data shuttle can
provide easy and reliable data
offload in wet environments
HOBO
®
4/25/2012 ONSET COMPUTER 3
4. onset ®
Choosing a Conductivity/Salinity Logger:
5 Important Considerations
• Accuracy
• Mounting
• Ease of deployment and data
offload
• Software
• Cost of ownership
HOBO
®
4/25/2012 ONSET COMPUTER 4
5. onset ®
Choosing a Conductivity/Salinity Logger:
Software
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
HOBO
®
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6. onset ®
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.
HOBO
®
4/25/2012 ONSET COMPUTER 6
7. onset ®
Choosing a Conductivity/Salinity Logger:
5 Important Considerations
• Accuracy
• Mounting
• Ease of deployment and data
offload
• Software
• Cost of ownership
HOBO
®
4/25/2012 ONSET COMPUTER 7
8. onset ®
Choosing a Conductivity/Salinity Logger:
Cost of Ownership
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
HOBO
®
4/25/2012 ONSET COMPUTER 8
9. onset ®
Recap of the 5 Important Considerations
• Accuracy
• Mounting
• Ease of deployment and data
offload
• Software
• Cost of ownership
HOBO
®
4/25/2012 ONSET COMPUTER 9
10. onset ®
Example:
HOBO Conductivity/Salinity Logger
• 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
HOBO
®
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11. onset ®
HOBOware Conductivity Assistant
• Calculates Salinity using PSS-78 • Uses field meter readings for
• Calculates Specific Conductance calibration of conductivity data
with choice of temperature • Start and end calibration points
compensation methods: used to compensate for fouling
– Linear compensation
– Freshwater compensation: EN27888
– Seawater compensation based on PSS-78
HOBO
®
4/25/2012 ONSET COMPUTER 11
12. onset ®
HOBOware for graphing and analysis
• 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
HOBO
®
4/25/2012 ONSET COMPUTER 12
13. onset ®
Choosing a Conductivity/Salinity Logger:
5 Important Considerations
Questions?
HOBO
®
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14. onset ®
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
HOBO
®
4/25/2012 ONSET COMPUTER 14
15. Contacting Onset
Questions about this webinar:
Paul Gannett
Direct Tel: 508-743-3149
paul_gannett@onsetcomp.com
General Product Questions:
Onset Technical Support: Product Application Specialists:
8am – 8pm EST Monday – Friday Tel. 1-800-564-4377
1-800-564-4377 / 508-759-9500 sales@onsetcomp.com
loggerhelp@onsetcomp.com
4/25/2012 Onset Computer Corp – www.onsetcomp.com
16. onset ®
Choosing a Conductivity/Salinity Logger:
5 Important Considerations
Questions and Answers
Thanks for attending!
HOBO
®
4/25/2012 ONSET COMPUTER 16