ChemgardTM Infrared Gas Monitor

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ChemgardTM Infrared Gas Monitor
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Chemgard Overview

• What is Photoacoustic Infrared and how does it
  compare with other technologies
• Review of traditional IR
• PIR Theory What happens when light meets sound?
• Comparison w/ traditional IR
• Electrochemical Sensors
• Flame Ionization Detectors
• Gas Chromatography
• Solid State Sensors
• Chemgard Markets Applications

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Photoacoustic Infrared Gas Detection Technology

• To better understand the advantages of
  Photoacoustic Infrared Technology, we will
  briefly compare it to the older, more commonly
  used Absorptive Infrared Technology.
• How Does It Differ?

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Infrared Detection Methodology

• Both absorptive and photoacoustic techniques
  utilize infrared energy of a selective
  wavelength.
• Majority of gases absorb infrared energy of
  various wavelengths.
• The wavelength selected for use in detection is
  determined by the gas in use and its specific
  characteristics.

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Infrared Technology

• Red is representative of a typical gas absorption
  characteristic.
• Yellow is an infrared wavelength used to detect
  this specific gas.

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Absorptive Technique

• All absorptive infrared detection methods differ
  from manufacturer-to-manufacturer. However, the
  basic principal remains the same.
• Sample and Reference measurements must be taken.
• The Sample cell is exposed to the gas to be
  detected.
• The Reference cell is either isolated from the
  gas to be detected or infrared energy outside the
  absorptive wavelength characteristics of the gas
  to be detected is used.
• The two measurements are compared. If they are
  equal, the instrument will indicate zero (0).

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Absorptive Technique

• When the gas to be detected is present, it
  absorbs some portion of the Sample infrared
  energy.
• The Reference infrared energy is unaffected by
  the gas to be detected.
• The change in ratio of the Sample and Reference
  detectors is the actual concentration of gas
  present.

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Photoacoustic Infrared Technology

• Has been in use since the 1960S
• MSA 10 Years of experience in PIR gas monitors
• Has replaced many traditional infrared analyzers
  as well as other sensing technologies

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Advanced Technology

• Photoacoustic Infrared sensing technology differs
  from all other available detection techniques on
  the market.
• It has Two distinct advantages
• The ability to sense a leak as low as in the PPB
  level for some applications.
• The ability to operate long periods of time
  without adjustment or zero drift, a common
  problem with all other technologies in use today.

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Basic PIR Cell Assembly
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Photoacoustic IR Optical Bench

• IR source - wire filament emitting multiple
  wavelengths of light
• Chopper (not shown) - used to setup modulation
• Optical filters
• provide sensitivity and selectivity for a given
  gas
• selected for specific application
• Optical block - volume can be changed for
  specific ranges
• Detector-high sensitivity microphone
• Solenoid valves - sample inlet and outlet provide
  seal during photoacoustic gas detection
• Heater and thermostat - temperature control
  critical for low PPM or PPB detection

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Photoacoustic Infrared Technology

• Sample Gas Enters the Cell..

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Toxic Gas Sensors
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Electrochemical Sensors
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Flame Ionization Detectors
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Gas Chromatographs
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Solid State Sensors
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Chemical Tape Technology
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Technology Comparison
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Gas Detection Comparison
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Chemgard Applications

• Applications include
• CO, CO2, cleaning agents, solvents, heat transfer
  fluids many other common industrial chemicals
• Photoacoustic Infrared Gas Detection used in
• plastics, paint, automotive, pharmaceutical,
  semiconductor, rubber other general chemical
  industries

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Some Chemgard Customers

• 3M
• Air Products
• BASF
• Chrysler
• Dow Chemical Co
• Dupont
• GE Plastics
• Kimberly Clark
• LA Municipal Authority
• Miller Brewing
• Mitsubishi
• Praxair
• Toshiba
• Walt Disney
• Xerox

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The Chemgard Advantage
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The Chemgard Advantage
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The Chemgard Advantage
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The Chemgard Advantage
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Chemgard Industries
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Petrochemical Industries
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Plastics Paint Industry
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Agricultural Industry
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Rubber Industry
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Medical Pharmaceutical Industry
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Semiconductor Industry
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Automotive Industry
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The Chemgard Advantage

• Utilizes Photoacoustic Infrared Gas Detection
  Technology
• Can detect a wide range of industrial compounds
• Detection of Percent, PPM or in some cases PPB
  levels
• High Sensitivity and Selectivity to Gas of
  Interest