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http://www.zetian-group.com/products/em-5-flue-gas-analyzer/

Overview
EM-5 series flue gas analyzer is a series of self-developed gas analysis products for online gas analysis of domestic as well as foreign environmental protection and industrial control. Based on UV Differential Optical Absorption Spectroscopy (DOAS) technology and chemometrics algorithm (PLS), it is able to measure the gas concentration of SO2, NO, NO2, O2, NH3, Cl2, O3, H2S, Ch3 and etc. With features of high measurement accuracy, high reliability, fast response time, wide application scope, it can be widely applied in occasions of environment online monitoring, industrial process control, safety monitoring and etc.
Depended on years of flue gas analyzer research experience and combined with practical experience of thousands of successful application cases, the analyzer has derived multiple types (standard type, low emission type, ultra-low emission type, and customized type) to meet different index requirements in different working condition.

UV DOAS technology. The optical technology platform consists of a light source, gas chamber, optical fiber and spectrograph (including the diaphragm, a holographic grating, linear array detector) and other optical components.

Ultraviolet light emitted by light source enters the gas chamber by an optical window and absorbed by measured sample gas flowed through the gas chamber. The light carrying sample absorption information will be gathered by the lens and coupled into an optical fiber and then transmits into spectrometer through fiber. After light splitting and photo-voltaic conversion, the gas absorption spectrum is obtained.

The corresponding component concentration in the gas can be calculated by analyzing the spectrum.
Note: the difference among standard analyzer, low emission analyzer, and ultra-low analyzer is the different optical path length of gas chamber: for standard analyzer, it adopts dual lens collimation system with 0.25m optical path; for low emission analyzer, it adopts multiple return structure with 1m optical path; for ultra-low emission analyzer, it uses white cell structure.

Features Of EM-5 continuous flue gas analyzer

High measurement accuracy
Minimum detection limit of SO2, NO, NO2 can reach 1mg/m3  (15m optical path)
Ultraviolet has no moisture absorption, undisturbed by moisture and dust
No cross interference between measured gases ( refer to table 1)
Measure NO and NO2 simultaneously without converter
Low detection limit

Measuring gas
InterferenceSO2NONO2O2
SO2 (500ppm)/<1ppmnono
NO (500ppm)no/nono
NO2 (500ppm)no<1ppm/no
H2O (no dew)nononono
CO (1000ppm)nononono
CO2 (20%)nononono
O2 (21%)nonono/

High reliability
Small zero drift and span drift
Modular design
No optical moving parts, without vibration influence
Strong gas chamber, low cost
Automatic adjustment spectrum technology, long maintenance-free period
Adopt pulse light source with 10-year service life

Technical Parameter Of EM-5 Flue Gas Analyzer

Measurement PrincipleUV-DOAS＋PLS
VersionsRegular rangeLow rangeUltra-low range
RangesMy rangeMax rangeMy rangeMax rangeMy rangeMax range
ComponentSO20-300ppm0-3000ppm0-100ppm0-300ppm0-50ppm0-100ppm
NO0-300ppm0-3000ppm0-100ppm0-300ppm0-50ppm0-100ppm
NO20-500ppm0-4000pp0-300ppm0-1000ppm0-100ppm0-200ppm
O2 (ECD or ZrO2)0-5%0-25%0-5%0-25%0-5%0-25%
Linearity≤±3%F.S.
Repeatability≤2%
Zero Drift≤ ± 2% FS / 7d
Span Drift≤ ± 2% FS / 7d
Response Time(T90)≤50s
Working Temperature-20 ℃ ～ ＋ 50 ℃
Preheating TimeNo preheating20min40min
Sample Gas InterfaceΦ6 Bi-Lok
Sample Gas FlowRange: (0.5 ～ 2) L / min, fluctuation ＜ 25%
Sample Gas PressureCurrent ambient pressure ±0.1Bar
Sample Gas Temp.0 ℃ ～ ＋ 50 ℃
Sample Gas HumidityNo condensation (under sample gas temperature)
4-20mA Input3 , configurable, 100Ω load
4-20mA Output5, output content can be configured, maximum load capacity ≤800Ω
Switching value Input6 , configurable
Relay Output14, output content can be configured. DC30V2A
Digital I / O1×Rs232, 1×Rs485 (Support Modbus protocol)
Installation Method19’ panel
Supply Voltage220VAC ± 10%
Rated PowerAbout 100WAbout 120W

Application Of EM-5 Flue Gas Analyzer

Coal-fired power plant
Cement plant
Industrial furnace
DeSOX process monitoring
DeNOX process monitoring
Waste incineration plant
PVC process in chlor-alkali plant
Titanium dioxide production process
Sulfur recovery process
Natural gas purification process
Methyl iodide analysis for the coal chemical industry 
On-line air monitoring

Hangzhou Zetian Technology is committed to the integrity, strength and quality of our air quality monitor. We're internationally recognized. We have 5 gas analyzer for sale! To learn more about the flue gas analyser working principle, please contact us!