HANGZHOU ZETIAN TECHNOLOGY CO., LTD.
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EM-5 Flue Gas Analyzer

EM-5 Flue Gas Analyzer

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 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

Interference

SO2

NO

NO2

O2

SO2 (500ppm)

/

<1ppm

no

no

NO (500ppm)

no

/

no

no

NO2 (500ppm)

no

<1ppm

/

no

H2O (no dew)

no

no

no

no

CO (1000ppm)

no

no

no

no

CO2 (20%)

no

no

no

no

O2 (21%)

no

no

no

/


  • 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 Principle

UV-DOAS+PLS

Versions

Regular range

Low range

Ultra-low range

Ranges

Min range

Max range

Min range

Max range

Min range

Max range

Component

SO2

0-300ppm

0-3000ppm

0-100ppm

0-300ppm

0-50ppm

0-100ppm

NO

0-300ppm

0-3000ppm

0-100ppm

0-300ppm

0-50ppm

0-100ppm

NO2

0-500ppm

0-4000pp

0-300ppm

0-1000ppm

0-100ppm

0-200ppm

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%F.S./7d

Span Drift

≤±2%F.S./7d

Response Time(T90)

≤50s

Working Temperature

-20℃~+50℃

Preheating Time

No preheating

20min

40min

Sample Gas Interface

Φ6 Bi-Lok

Sample Gas Flow

Range: (0.5~2)L/min, fluctuation<25%

Sample Gas Pressure

Current ambient pressure ±0.1Bar

Sample Gas Temp.

0℃~+50℃

Sample Gas Humidity

No condensation (under sample gas temperature)

4-20mA Input

3 , configurable, 100Ω load

4-20mA Output

5, output content can be configured, maximum load capacity ≤800Ω

Switching value Input

6 , configurable

Relay Output

14, output content can be configured. DC30V2A

Digital I/O

1×Rs232, 1×Rs485 (Support Modbus protocol)

Installation Method

19’ panel

Supply Voltage

220VAC±10%

Rated Power

About 100W

About 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

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