O2 Concentration Analyzer: Final Presentation

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O2 Concentration Analyzer Final Presentation

• Group 11
• Mentor Dr. David Sept
• Ivan Dimitrov
• Hannah Jacobs-El
• Damien Pechak

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Outline

• Need
• Our design
• Specifics and Analysis of Design
• Materials and Manufacture
• Conclusion

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Need

• Nearly one-third of childhood deaths in
  developing nations are caused by acute
  respiratory infection (ARI)
• Oxygen therapy is limited due to difficulties in
  maintaining an oxygen supply
• Oxygen concentrations need to be periodically
  checked
• Oxygen analyzers are presently expensive
  electronic devices not designed for extreme
  environmental conditions
• Our project aims to alleviate these problems

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Specifications
5
Our Design

• Use a redox reaction that relates the oxygen
  concentration to a change of color
• Modeled it on existing disposable CO2
  concentration sensors
• Plastic cover, with a disposable indicator strip
  inside

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Analysis

• FEMLAB analysis
• To make sure we would get adequate flow over the
  paper
• Pressure has to be similar to atmospheric to
  allow for an even reaction over indicator.

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Flow Analysis

• Flow
• Mach Number
• Compression effects
• Reynolds Number
• Laminar
• Entrance lengths
• Analytical Pressure Drop
• Atmospheric Approximation

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Kinetics Analysis

• 1-D steady state model approximation
• Convection (flow)
• Diffusion (film)
• Reaction (indicator)

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Determining O2 Concentration

• Using Ficks law we calculated the flux.
• We got the final result in terms of a constant
  and time
• The constant is dependant on thickness, pressure
  and temperature

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Constant of Proportionality
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Kinetic Analysis (cont.)

• System Equation
• 4-D
• Three independent variables
• Temperature, Atmospheric Pressure, PO2
• Time equation
• Graphs
• Percentage O2
• Constant of Proportionality
• Time versus Percent O2
• C 1
• Tunability
• Thickness modification to get C 1 for any
  condition
• Reaction approximation limits

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Manufacturing the casing

• Material PVC plastic
• Process Injection mold
• Two designs
• Chose top
• Easier to load

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Manufacturing Indicator strip

• Whatmans Paper
• Chromatographic Paper
• Grade 3MM-Chr
• Saturate in Solution
• 2,6-Dichloroindophenol sodium salt
• Polyethylene Film/Anaerobic Packaging
• Controls and Prevents reaction
• Heat Sealing

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Final Prices

• For Case
• 3.12-4.12
• Base on an estimate of 1000 units
• reusable
• For Indicator
• 0.60 per unit
• One time use
• Total
• 3.72-4.72

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Safety Analysis

• Design Safe was used to assess the hazards of the
  O2 detector.
• Potential Hazards
• -2,6-Dichloroindophenol sodium salt
• 1. If ingested GI disturbances
• 2. Irritation if eye or skin contact
• -Medical grade PVC plastic none
• -Fructose none
• -Polyethylene none
• -Whatmans Paper none
• Potential hazards unlikely to occur!

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What Next?

• Wet lab experiments
• Define the kinetics better
• Make a prototype

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Concluding Remarks

• Objectives complete?
• Yes!
• What did we learn?
• How to work with new people
• Work with deadlines and manage time
• IP?

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Sources

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Questions?