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ChemgardTM 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

The Chemgard Advantage

The Chemgard Advantage

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