Choosing a conductivity salinity logger part 1 of 2
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Choosing a conductivity salinity logger part 1 of 2

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Part 1 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 ...

Part 1 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 1 of 2 Choosing a conductivity salinity logger part 1 of 2 Presentation Transcript

  • onset ® Choosing a Conductivity/Salinity Logger: 5 Important Considerations Part 1 of 2 Paul Gannett Product Marketing Manager HOBO ®4/25/2012 ONSET COMPUTER 1 1
  • onset ® Choosing a Conductivity/Salinity Logger: 5 Important Considerations Topics • Onset Overview • Typical Conductivity/Salinity Applications • The 5 Considerations • Q & A’s HOBO ®4/25/2012 ONSET COMPUTER 2
  • onset ® Who is Onset? • Leader in portable Data Loggers • Founded in 1981 • 130 employees • Designed and assembled in Bourne, MA • Over 2 million HOBO data loggers sold HOBO ®4/25/2012 ONSET COMPUTER 3 3
  • onset ® Onset Markets Field Research Water Management Energy Management HOBO ®4/25/2012 ONSET COMPUTER 4
  • onset ® Choosing a Conductivity/Salinity Logger: Typical Applications • Coastal and estuary research • Stream restoration • Water quality monitoring • Road runoff • Agricultural runoff • Monitoring downstream of mines HOBO ®4/25/2012 ONSET COMPUTER 5
  • 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 6
  • onset ® Choosing a Conductivity/Salinity Logger: Accuracy Considerations • Specified accuracy – percent of reading & minimum error • The logger’s temperature accuracy – Every 0.5C of temperature error causes 1% error in specific conductance and salinity • Sensor technology – electrodes in contact with water can corrode, especially in salt water. Non-contact sensors have minimal drift. • Fouling can cause significant measurement drift (next slide) • Software (covered later) HOBO ®4/25/2012 ONSET COMPUTER 7
  • onset ® Choosing a Conductivity/Salinity Logger: Accuracy Considerations Fouling Happens! … plan for it • frequent cleaning • antifouling materials – Biocides/copper – inert materials • Use field calibration points from the beginning and end of each deployment to compensate for fouling HOBO ®4/25/2012 ONSET COMPUTER 8
  • 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 9
  • onset ® Choosing a Conductivity/Salinity Logger: Common Mounting Methods Stilling Well - In ground or attached to a structure such Tether Mount Post Mount as bridge or dock HOBO ®4/25/2012 ONSET COMPUTER 10
  • onset ® Choosing a Conductivity/Salinity Logger: Mounting Considerations • The logger should be placed in a location that has good, continuous water flow, if possible • Keep the logger at least an inch from metal surfaces • PVC pipe and zip ties are great for mounting HOBO ®4/25/2012 ONSET COMPUTER 11
  • onset ® Choosing a Conductivity/Salinity Logger: Mounting Considerations Features to look for: • Does the logger sink or float? Loggers that sink are generally easier to deploy. • The smaller the logger, the easier it is to deploy. • How will the logger be mounted? An eyelet makes it easy to hang in wells. • Can the logger be mounted so that is sheds air bubbles? HOBO ®4/25/2012 ONSET COMPUTER 12
  • 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 13
  • 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 14