E VERY L IFE H AS A P URPOSE… Chemgard TM Infrared Gas Monitor

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

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?

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.

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

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).

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.

Photoacoustic Infrared Technology  Has been in use since the 1960’S  MSA –10 Years of experience in PIR gas monitors  Has replaced many traditional infrared analyzers as well as other sensing technologies

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.

Basic PIR Cell Assembly

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

Photoacoustic Infrared Technology  Sample Gas Enters the Cell…..

Toxic Gas Sensors

Electrochemical Sensors

Flame Ionization Detectors

Gas Chromatographs

Solid State Sensors

Chemical Tape Technology

Technology Comparison

Gas Detection Comparison

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

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

The Chemgard Advantage

Chemgard Industries

Petrochemical Industries

Plastics & Paint Industry

Agricultural Industry

Rubber Industry

Medical & Pharmaceutical Industry

Semiconductor Industry

Automotive Industry

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