EM-5 Flue Gas Analyzer

Overview

EM-5 series flue online gas analyzeris a series of self-developed gas analysis products for online gas analysisof 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.

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
SampleGas 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 valueInput		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

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.

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