1 / 3

CLD

CLD. With dry air produced ozone is mixed with sample gas. The mixture enters the reaction chamber, while the NO of the sample gas reacts to NO 2 : NO + O 3  NO 2 + O 2 + h A proportion of the reaction energy is emitted as infrared radiation ( h).

rashad-compton
Download Presentation

CLD

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. CLD

  2. With dry air produced ozone is mixed with sample gas. • The mixture enters the reaction chamber, while the NO of the sample gas reacts to NO2 : • NO + O3 NO2 + O2 + h • A proportion of the reaction energy is emitted as infrared radiation(h). • The infrared radiation is detected, enhanced and transformed into the detector signal by the photomultiplier. • The NO2 of the sample gas is converted into NO by the integrated converter and then measured in a separate reaction chamber. • The difference between both measurements corresponds to the NO2 content of the sample gas.

  3. CLD - Measuring Principle The chemiluminescence is disturbed by “Quenching” effects. They are caused by absorption of the emitted radiation by other components and by radiation-free energy loss due to collision processes. Remedy: Reduced pressure (35 mbar)  reduction of collision processes. Selection of a measuring range (650-850 nm) with low foreign absorption. Due to the high amplification factor of the photomultiplier (1:100.000) emission flanks can be used.

More Related