e very l ife h as a p urpose… chemgard tm infrared gas monitor
TRANSCRIPT
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EVERY LIFE HAS A PURPOSE…
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 1960’S
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