Flue Gas Analyzer
> Application
Apply to exhaust emission monitoring and process control such as coal-fired power plants, garbage power plant, cement, glass, lime factory, ceramics factory, sinter, coke oven, desulfurization, denitration technology.
> Technical principle
Ultraviolet differential optical absorption spectroscopy (DOAS)
Due to 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.
Unique algorithms of differential optical absorption spectrum
Molecular concentration can be analyzed by absorption spectra, which measurement principle is Beer – Lambert relation ：
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Measurement principle |
SO2, NO and NO2: DOAS technologyO2: Electrochemical principleCO: NDIR technology |
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Measurement range |
SO2, NOx: 0~300~3000ppm(standard range ) SO2, NOx: 0~20~100ppm (Ultra-low range ) CO: customizable O2: 0~25% |
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Repeatability |
≤0.5% |
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Linearity |
≤±2%F.S. |
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Zero drift |
≤±2%F.S./week |
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Span drift |
±2%F.S./week |
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Response time |
10 s (T90) |
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Enclosure Rating |
IP42 |
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Analog output |
5~ 4-20mA, configurable |
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Analog input |
3~ 4-20mA, configurable |
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Digital quantity input |
6, configurable |
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Digital output |
14, configurable |
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Power supply |
Rated voltage: 100V~240V Rated power: 120W AC frequency: 50/60 Hz |
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Digital Comm. |
RS485/RS232/GPRS |
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Ambient temperature |
-10℃~50℃ |
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Ambient humidity |
0~95%RH, non-condensing |
> Feature
1. Low detection limit and temperature-drift
2. Getting NOx by directly measuring NO and NO2 without NO2→NO converter
3. No interference of particulate matter, moisture and other factors
4. No optical moving parts, high reliability, no interference to the measurement by field
