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Mechanical Components - Gas & Chemical Sensors

 


Chemical / Gas Concentrations

Catalytic Sensor
Catalytic Sensor

There are many different types of sensors for detection concentration levels of chemicals and gasses. These sensors are critical for safety considerations in many industrial applications.

 

 

Following is a table providing a brief summary of sensor types and applications.

 

Sensor type

Detectable gases

Usable range

Pro's

Con's

Electrochemical Toxics, oxygen ppm levels Low power, accurate, repeatable 3 year lifetime slightly lower at high temps; some types are cross-sensitive
Pellistor Flammables LEL levels Generally good in all ways; portable Can be damaged by high levels of H2S, but poison resistant types are available
Infrared Flammables and CO2 0.1 (or less) to 100% by volume Fail safe; generally excellent Expensive (but getting cheaper); non-portable
Thermal Conductivity Many, at % levels, including binary mixtures % levels 20 year life (at least); stable; can detect inert gases Only appropriate for certain gases

 

 




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