Introduction To Flame Ionization

Article by: Christopher Miller

A Flame-Ionization Detector (FID) measures real-time concentrations of organic , We Like Growing Dura Heat and Heritage River Birch Trees vapors in low levels from parts-per-billion (ppb) up to 50,000 parts-per-million (ppm). A FID is a very sensitive instrument used in a wide variety of applications such as: *Hazardous waste sites *Clean-up of spills *Protecting workers from toxic vapors *Refineries *Leak detection for compliance *Pulp and paper plants , England Expects Every Man Will Do His Duty *Hazardous materials response *Terrorist chemical attacks How Does an FID Work? FIDs, like PIDs, are ionization detectors. The difference between them is the way ions are produced. In our "introduction to PIDs" section you learned that PIDs use high energy , supply Sino-NSH VFD Double-Stage High-Efficiency Vacuum Insulation Oil Purifier/oil purification/oil Ultra Violet light , Another Doomsday, Another Dollar: Shifting Science Towards P to ionize molecules. FIDs do not use ultra violet light, , SINO-NSH LV Lubrication Oil treatment plant instead the compounds in the sample stream are burned in a hydrogen fueled-flame. The hydrogen flame can ionize any organic , Plant a Sugar Maple or the Green Giant Arborvitae? material with an ionization potential (IP) of 15.4 or less. Like the PID, ions formed in the sample stream are driven in one direction by a bias electrode and accumulated at a collecting electrode. The ion current is then amplified and converted to a meter readout (analog or digital, depending on the model FID) in parts-per-million. view a diagram When to Use an FID FID's just like PID's are primarily screening devices. They will detect any volatile organic , Taming Hurricane Pedro Gives Hope for the Future compound (VOC) with an Ionization Pot , Unusual Uses of Backyard Plants and Trees ential below 15.4 eV. Simply put, a FID tells you that something is there, never what it is (besides that it is a VOC), and only sometimes how much. For example, the standard calibration for a FID is 100ppm Isobutylene, if isobutylene is the VOC in the air , Using the Sun for Power - How It Works the ppm reading on the instrument is an accurate representation of how much Isobutylene is present. However, if there is or can be other VOC's in the air, , Silicon Shortage Drives Global Solar M&A you can only be certain that something is there, not what or how much. Sometimes FID's can be calibrated to other gases, like Methane. Some FID's contain built in correction factors that allow the instrument to be calibrated to Isobutylene but have the reading adjusted for other gases. PID or FID? PID's are susceptible to humidity and cannot detect VOC's with an ionization potential above 11.8 eV. FID's are not susceptible to humidity and can detect VOC's up to 15.4 eV. FID's are desirable in situations of high humidity, or when detecting gas , EZ Trees to Plant es with high ionization potentials like Methane. This comes at the cost of having to have a not only a battery, but a Hydrogen cylinder to fuel the flame.

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