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Gas sensors work by having some kind of electrical transducer that converts the presence of gas into a measurable signal. There are several kinds of transducers for gas sensing, here are the most common (widespread commercial adoption today):
1. Electrochemical - The presence of a gas causes an electrochemical reaction (electron transfer) which can be measured. Amperometric electrochemical sensors measure current flow, and are very common for gases like Carbon Monoxide, Hydrogen Sulfide, Alcohol, and others. Potentiometric electrochemical sensors measure a voltage change, and are used mainly for oxygen sensing (e.g. in engines).
2. Optical - Many gases interact with radiation of certain wavelengths, typically absorbing it. One of the most common optical gas sensors is infrared, mainly Nondispersive infrared (or NDIR), where an infrared emitter (most commonly a hot filament similar to an incandescent light bulb) emits infrared radiation is used in tandem with an infrared detector. If gas is present (such as CO2) it will absorb some of that infrared radiation coming from the emitter, and the signal detected by the detector will drop.
3. Semiconductor - Also known as Metal Oxide Semiconductor or MOS sensors, are just heated films of a metal oxide like tin oxide. At high enough temperatures (e.g. 200-600C) many gases will adsorb onto the surface of the oxide and cause the resistance to change. Their performance is generally inaccurate, but these are the least expensive sensors available, typically used for measuring methane, carbon monoxide, and many other gases.
4. Pellistor - Also known as a catalytic bead sensor, is just wire of platinum with enough current passing through it to heat it up to ~500C. A catalyst is placed on its surface (typically a combination of Pt & alumina). When an explosive gas is present, it will burn on the hot catalyst causing the resistance of the wire to increase. These sensors are mainly used to determine how close the gas concentration is to the lower explosive limit (%LEL).
Some companies that make end user gas detectors (that use these gas sensors) include Bacharach, Honeywell, Industrial Scientific, Mine Safety Appliances, Sensorcon, RAE Systems
What else can I help you with?
How can the carbon monoxide sensor detect carbon monoxide alone from the atmosphere?
A carbon monoxide sensor contains a chemical that reacts specifically with carbon monoxide to produce an electrical signal that can be measured. This allows the sensor to distinguish carbon monoxide from other gases in the atmosphere and detect its presence.
What are the materials to absorbs the carbon monoxide?
Materials that can absorb carbon monoxide include activated carbon, zeolites, and metal oxides like copper oxide. These materials work by physically or chemically binding with the carbon monoxide molecules to remove them from the air.
Does charcoal contain carbon monoxide?
It does not contain carbon monoxide, but it will likely produce carbon monoxide when burned.
What is the symbol for carbon monoxide?
The symbol for carbon monoxide is CO. Carbon monoxide contains one carbon atom (C) and one oxygen atom (O).
What is the chemical formula for the Carbon monoxide (covalent)?
The chemical formula for the carbon monoxide is CO.
How can the carbon monoxide sensor detect carbon monoxide alone from the atmosphere?
A carbon monoxide sensor contains a chemical that reacts specifically with carbon monoxide to produce an electrical signal that can be measured. This allows the sensor to distinguish carbon monoxide from other gases in the atmosphere and detect its presence.
A child is born prematurely and experiences severe asthma. Which most likely affected cell differentiation when the child was a developing embryo?
Carbon monoxide
Do crowcon gas detectors work with carbon monoxide?
Crowcon does have gas detectors that will detect carbon monoxide. The detector will send out a signal to warn your household that there is a dangerous amount of carbon monoxide.
What are the materials to absorbs the carbon monoxide?
Materials that can absorb carbon monoxide include activated carbon, zeolites, and metal oxides like copper oxide. These materials work by physically or chemically binding with the carbon monoxide molecules to remove them from the air.
How can not replacing a oxygen sensor for a Honda Civic LX affect the car?
you might die from carbon monoxide
Does charcoal contain carbon monoxide?
It does not contain carbon monoxide, but it will likely produce carbon monoxide when burned.
What is abbreviation for carbon monoxide?
The chemical symbol for carbon monoxide is CO.
What is the symbol for carbon monoxide?
The symbol for carbon monoxide is CO. Carbon monoxide contains one carbon atom (C) and one oxygen atom (O).
What is the chemical formula for the Carbon monoxide (covalent)?
The chemical formula for the carbon monoxide is CO.
How much carbon monoxide does soda have?
Soda does not have any amounts of carbon monoxide. It has carbon dioxide dissolved in it, but no carbon monoxide.
Does carbon monoxide have a scent?
carbon monoxide is odourles,colourless and is a gas
Is carbon monoxide CO2?
No, carbon monoxide is CO. CO2 is carbon dioxide.
