Optical Fluorescence Technology

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• Optical Fluorescence Technology
• Dissolved or Gas Phase
• Oxygen Measurements
• Model 4401 Oxy
• John Gleeson
• Barben Analyzer Technology

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Membrane TechnologyClark Electrode what is it?

• Amperometric Measurement
• Self-Consuming
• Maintenance Intensive
• Unstable Reading

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Optical Sensing is More Reliable

• Clark Electrodes Consume Oxygen and will give you
  false readings in stagnant water, Optical Sensors
  DO NOT consume oxygen
• Not Affected by Turbulence, Vacuum, or Pressure
• There are no parts to replace on the probe. This
  reduces hours of lost time on maintenance and the
  cost of replacement parts.

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Why Do We Use Lifetime DecayVsIntensity Based
Measurement

• The decay time does not depend on fluctuations in
  the intensity of the light source and the
  sensitivity of the detector
• The decay time is, to a great extent, independent
  of the concentration of the indicator in the
  sensitive layer ? Photo bleaching and leaching of
  the indicator dye has no influence on the
  measuring signal
• The decay time is not influenced by variations in
  the optical properties of the sample including
  turbidity, refractive index and coloration.

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Optical Sensing hasMinimal Maintenance
Requirements

• No electrolyte solutions
• No membranes or sensors to change
• No more constant calibration
• Easy maintenance of probe.
• Sensor Not damaged by direct or indirect sunlight

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Fluorescent Dissolved Oxygen Monitoring

• Basic Principles of Operation
• And
• Technology

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• What is an optical-chemical sensor?
• How does it work?
• What are its advantages?

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Optical Chemical Sensors (Optodes)
Non-Invasive Measurement Through Glass or PET
Invasive Probe Type
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Principle of operation 1)
Luminescence process without oxygen 2)
Luminescence process with oxygen, attenuates the
dye The amount of oxygen is proportional
to the attenuation of the dye
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Optode Detection Method
Fluorescence Decay
O2a 0
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Optode Detection Method
Fluorescence Decay
O2a 0
O2b gt 0
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Optode Detection Method
tf(p(O2))
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Optode Detection Method
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Optode Detection Method
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Optode Detection Method
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Measurement Ranges
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Measurement Ranges
Different range of sensors available
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Technology ComparisonOptical Sensor vs. Membrane
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Measurement ComparisonOptical vs. Membrane
1. DO in front of the filler (Brewing Process)
Comparison with (standard) electrode
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Measurement ComparisonOptical vs. Membrane
2. DO in bottles (Brewing Process)
Comparison with (standard) electrode
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Comparison Optical vs. Electrode3. Air
saturation (Atmospheric) to zero (N2 99.999)
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Non-Invasive Measurement
4. DO in bottles with swing stoppers
Not possible Comparison with (standard) electrode
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Measurement fittings for process
5. DO measurement through glass
Not possible Comparison with (standard) electrode
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• Optical Applications
• Dissolved or Gas Phase
• Boiler Feed, Beverage, Chemical, Fermentation,
  Food, Petrochemical, Pipelines, Purity,
  Semiconductor, etc

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Sensors
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Questions?Thank you

• Further Information Contact
• Barben Analyzer Technology
• 1701 South Sutro Terrance
• Carson City, NV 89706
• [phone]