Hydrogen sulfide sensor

A hydrogen sulfide sensor or H₂S sensor is a gas sensor for the measurement of hydrogen sulfide.^[1]

Principle

The H₂S sensor is a metal oxide semiconductor (MOS) sensor which operates by a reversible change in resistance caused by adsorption and desorption of hydrogen sulfide in a film with hydrogen sulfide sensitive material like tin oxide thick films and gold thin films. Current response time is 25 ppb to 10 ppm < one minute.

Applications

This type of sensor has been under constant development because of the toxic and corrosive nature of hydrogen sulfide:

• The H₂S sensor is used to detect hydrogen sulfide in the hydrogen feed stream of fuel cells to prevent catalyst poisoning and to measure the quality of guard beds used to remove sulfur from hydrocarbon fuels.^[2]/-

Research

• 2004 - a nanocrystalline SnO2–Ag on ceramic wafer sensor is reported.^[3]

See also

• Calibration
• CMOS
• Drift (sensor)
• Glossary of fuel cell terms
• List of sensors
• Microelectromechanical systems
• Thin film metal oxide semiconductor

References