Patrick J. Silva
Silva & Silva
Attorneys at Law
* 17 Years of Top Level DUI Experience!
* I Teach Other Lawyers DUI Defense!
* Well Known & Respected in the Courts!
What is Inside of that Machine?
History Fuel Cell White Paper Fuel Cell Animation
In the early 1800's a British scientist discovered the fuel cell effect. He immersed two platinum electrodes in sulfuric acid electrolyte and supplied hydrogen at one electrode and oxygen at the other. The resulting reaction created a current flow between the electrodes. There was no practical application of fuel cells at that time because of high cost and technological problems. In the 1960s, researchers at the University of Vienna demonstrated a fuel cell that was specific for alcohol. This evolved into the present-day cell used in all fuel cell-based breath alcohol measurement instruments.
In its simplest form, the alcohol fuel cell consists of a porous, chemically inert layer coated on both sides with finely divided platinum oxide (called platinum black). The manufacturer impregnates the porous layer with an acidic electrolyte solution, and applies platinum wire electrical connections to the platinum black surfaces. The manufacturer mounts the entire assembly in a case, which also includes a gas inlet that allows a breath sample to be introduced. Various manufacturers employ numerous proprietary nuances in their construction. The basic configuration, however, follows that described above and illustrated above.
The chemical reaction that takes place in an alcohol fuel cell converts alcohol to acetic acid. In the process, this conversion produces a fixed number free electrons per molecule of alcohol. This reaction takes place on the upper surface of the fuel cell. H+ ions are freed in the process, and migrate to the lower surface of the cell, where they combine with atmospheric oxygen to form water, consuming one electron per H+ ion in the process. Thus, the upper surface has an excess of electrons, and the lower surface has a corresponding deficiency of electrons. If you connect the two surfaces electrically, a current flows through this external circuit to neutralize the charge. This current is a direct indication of the amount of alcohol consumed by the fuel cell. By measuring the amount of current, you can determine the amount of alcohol in the sample.
The alcohol fuel cells used in Intoximeters, Inc. instruments are highly specific for alcohol on the human breath. The fuel cell produces a linear relationship between current created and alcohol concentration in the breath sample.
Early methods of analyzing the fuel cell output measured the peak rate of reaction and were limited in their ability to deal with the reduced rate of the alcohol oxidation when a series of positive samples were provided in succession.
Current patented methods used for analyzing the output of the cell have solved this problem in that they measure the amount of current generated from the alcohol oxidization reaction as opposed to the rate at which the current was generated. By using this method, the same fuel cell produces results that do not significantly degrade with use and remain within calibration for extended periods of time.
Strengths of Fuel Cell Based Analyzers
Weaknesses of Fuel Cell Based Analyzers
Highly specific for alcohol on the human breath. Does not require multiple sensors and the necessary maintenance to demonstrate that those sensors are performing properly to accurately identify alcohol.
Analyzes one small fixed volume of breath. It does not analyze changes in the breath sample over the entire submission of the sample.
Linear response to alcohol allows one point calibration of the system.
Low power requirements allows for small packaging of system that produces results as accurate as large desktop instruments.
Battery operated systems available.
The Intox EC/IR II is a bench-top instrument featuring fuel cell integration analysis combined with real-time analytical advantages of infrared technology.
The sampling system in the Intox EC/IR II utilizes advantages of both electrochemical sensor (EC) and infrared sensor (IR) technology. The Infrared system is capable of measuring in real time, both alcohol and carbon dioxide concentrations in the breath. The electrochemical sensor system is utilized to quantify the alcohol concentration in a breath sample.
Software settings and test database are monitored to insure their integrity. The instrument also contains advanced radio frequency interference immunity and detection, automatic accuracy checks and calibrations using internal gas tank or external simulator (recirculation for wet bath use), self-diagnostic capabilities, an easy to read 256 x 32 pixel graphic vacuum fluorescent display and is capable of remote diagnostics along with centralized data collection using optional IntoxNet software.
Dui Lawyer San Bernardino, DUI Lawyer Riverside, DUI Lawyer Victorville, DUI Lawyer Rancho Cucamonga, DUI Lawyer Joshua Tree, DUI Lawyer Murrieta, DUI Lawyer Indio, DUI Lawyer Banning, DUI Lawyer Santa Ana, DUI Lawyer Fullerton, DUI Lawyer Harbor, DUI Lawyer Pomona, Aggressive DUI Lawyer, Drunk Driving Lawyer, Drunk Driving Defense Attorney, Hire a DUI Lawyer, Best DUI Lawyer, DUI Trial Lawyer.DMV Drivers License Lawyer, DUI Facts, DUI Criminal Law Attorney Dui Lawyer, Dui Lawyer Colton, Dui Lawyer Grand Terrace, Dui Lawyer Rialto,
Dui Lawyer Fontana, Dui Lawyer Highland, Dui Lawyer Redlands, Dui Lawyer Loma Linda, Dui Lawyer Bloomington, Dui Lawyer Upland, Dui Lawyer Ontario, Dui Lawyer Claremont, Dui Lawyer Big Bear, Dui Lawyer Apple Valley, Dui Lawyer Barstow, Dui Lawyer Moreno Valley, Dui Lawyer Hemet, Dui Lawyer San Jacinto, Dui Lawyer Beaumont, Dui Lawyer Palm Springs, Dui Lawyer Palm Desert, Dui Lawyer Corona, Dui Lawyer Norco, Dui Lawyer Lake Elsinore, Dui Lawyer Montclair, Dui Lawyer La Verne, Dui Lawyer San Dimas, Dui Lawyer Glendora, Dui Lawyer Valinda, Dui Lawyer Azusa, Dui Lawyer West Covina, Dui Lawyer Covina, Dui Lawyer Duarte, Dui Lawyer Monrovia,Dui Lawyer Pasadena, Dui Lawyer La Puente, Dui Lawyer Huntington Beach, Dui Newport Beach, Dui Lawyer Irvine, Dui Lawyer Anaheim, Dui Lawyer Orange, Dui Costa Mesa, Dui Lawyer Tustin, Dui Lawyer Garden Grove, Dui Lawyer Brea, Dui Lawyer Yorba Linda, Dui Lawyer Fountain Valley, Dui Lawyer Buena Park, Dui Lawyer Westminster, Dui Lawyer La Habra, Dui Lawyer Stanton, Dui Attorney San Bernardino, Dui Attorney Victorville, Dui Attorney Rancho Cucamonga, Dui Attorney Highland, Dui Attorney Redlands, Dui Attorney Colton, Dui Attorney Fontana, Dui Attorney Rialto, Dui Attorney Upland, Dui Attorney Ontario, Dui Attorney Claremont, Dui Attorney Apple Valley, Dui Attorney Big Bear, Dui Attorney Grand Terrace, Dui Attorney Riverside, Dui Attorney Joshua Tree, Dui Attorney Murrieta, Dui Attorney Indio, Dui Attorney Banning, Dui Attorney Beaumont, Dui Attorney Hemet, Dui Attorney San Jacinto, Dui Attorney Corona, Dui Attorney Norco, Dui Attorney Palm Springs, Dui Attorney Palm Desert, Dui Attorney Pomona, Dui Attorney Valinda, Dui Attorney Montclair, Dui Attorney Glendora, Dui Attorney San Dimas, Dui Attorney La Verne, Dui Attorney Azusa, Dui Attorney West Covina, Dui Attorney Covina, Dui Attorney Monrovia, Dui Attorney Pasadena, Dui Attorney City of Industry,Dui Attorney La Puente