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Hydrogen Sensors Report

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YDROGEN SENSORS
REPORT ON: HYDROGEN SENSORS & EXTRACTING HYDROGEN FROM WASTEWATER
Extraction of Hydrogen from Sewage Page 27
Hydrogen sensors are of increasing importance in connection with the development and expanded use of hydrogen gas as an energy carrier and as a chemical reactant.
A hydrogen sensor is a gas detector that detects the presence of hydrogen.
They contain micro-fabricated point-contact hydrogen sensors and are used to locate hydrogen leaks. They are considered low-cost, compact, durable, and easy to maintain as compared to conventional gas detecting instruments
There are an immense number of sensors reported in the literature for hydrogen detection and in this work these sensors are classified into eight different
operating …show more content…

The lower explosive limit (LEL) and upper explosive limit (UEL) are the two most common terminologies used to indicate the flammable levels for many fuels including hydrogen.
Hydrogen is one of the least flammable materials at 4% but has a larger window
(4–75% v/v H ) of flammability in comparison to natural gas, gasoline, propane, ethane, methane, propylene, etc. The flammability limit of hydrogen is seven times wider than methane.
It is, therefore, critical for a hydrogen sensor to have a wider measurement range (1–99% v/v H2) for safety applications than most common fuels.
Hydrogen is the lightest of elements and the smallest molecule; it, therefore, has the greatest tendency to leak.
REPORT ON: HYDROGEN SENSORS & EXTRACTING HYDROGEN FROM WASTEWATER
Extraction of Hydrogen from Sewage Page 28
Hydrogen Measuring Principles
Performance
 Sensors must have a broad operating range in air, nitrogen, and inert backgrounds (2–99% v/v) and good sensitivity well before the explosive limit (4% H2) in air backgrounds to meet National Fire Protection
Association (NFPA) safety guidelines.
 Continuous operation in gas streams containing hydrocarbons,

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