Contact Us@ +91 7382708685

Gas Analyzers

UVDOAS Gas Analyzer

Posted: February 6, 2017 at 6:39 am   /   by   /   comments (0)

Ultraviolet Differential Optical Absorption Spectroscopy Gas Analyzer(UV DOAS)

Online-H2S-Gas-Monitor
Vasthi Instruments UV DOAS Gas Analyzer for Sox, Nox and other emission monitoring as per CPCB Guidelines.
The module uses the long optical path UV DOAS technology. Its optical technology platform consists of light source, gas chamber, optical and spectroscopic (including diaphragm, holographic grating, linear array detector) and other optical components.
The same gas has different absorption in different spectral band, the absorption of different gases in the same spectral band has superposition effect. Through the analysis of continuous spectrum, a variety of gas can be measured at the same time. The holographic grating is used for light splitting of light absorbed by gas to be measured, sensor array is used to convert the spectral optical signals into electrical signals, after obtaining the continuous absorption spectra of medium, and a variety of gas can be measured at the same time.
Differences between Different Technologies:

   NDIR Technology    FTIR Technology UV Fluorescence+ Chemiluminescence UV DOAS Adopted Technology
I. Low cost I. High cost I. High cost I. Low cost
II. Measure few components:Generally, the single gas chamber can only measure one kind of gas II. Measure over 10 components, which is the greatest advantage II. Measure few components, Different components with different measurement principle. II. The single gas chamber can measure 3-5 components
III. Precious gas chamber, high cost and complicated replacement III. Precious gas chamber, high cost and complicated replacement III. Precious chamber, high cost and complicated replacement III. Strong gas chamber low cost and convenient replacement
IV. Have the optical moving parts, with low reliability IV. The interferometer is an optical moving part IV. No optical parts IV. Adopt the full spectrum electronic scanning and have no optical moving parts
V. Single or dual wavelength measurement; easy to be affected by the interfering gas V. Full infrared spectrum measurement, and have no effect by the cross interference V. Very sensitive to some interference , such as background fluorescence and quenching effect, etc. V. Full ultraviolet spectrum measurement, and have no effect by the cross interference
VI. Fast response, low measurement accuracy and large drift VI. Restricted by the scanning time; slow response, high measurement accuracy and small drift VI. Fast response, Background light resulting in poor results of stability and reproducibility; high measurement accuracy and large drift VI. Fast response, high measurement accuracy and small drift
VII. High requirements for the measured gas, no dust and low dew point VII. High requirements for the measured gas, no dust and low dew point VII. High requirements for the measured gas, no dust and low dew point VII. Low requirements for the measured gas, applicable to the operating environment with dust or high humidity
VIII. Adopt the continuous light source, with the service life of thousands VIII. Adopt the continuous light source, with the service life of thousands of hours VIII. Adopt the continuous light source, with the service life of thousands of hours VIII. Adopt the pulse light source, with the service life of 10 years

Download Catalog

Comments (0)

write a comment

Comment
Name E-mail Website