Description
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.
Feature
- 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
Spesification
|
Measurement Principle |
UV-DOAS+PLS |
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|
Versions |
Regular range |
Low range |
Ultra-low range |
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Ranges |
Min range |
Max range |
Min range |
Max range |
Min range |
Max range |
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|
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 |
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|
NO2 |
0-500ppm |
0-4000pp |
0-300ppm |
0-1000ppm |
0-100ppm |
0-200ppm |
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|
O2 (ECD or ZrO2) |
0-5% |
0-25% |
0-5% |
0-25% |
0-5% |
0-25% |
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|
Linearity |
≤±3%F.S. |
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Repeatability |
≤2% |
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Zero Drift |
≤±2%F.S./7d |
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Span Drift |
≤±2%F.S./7d |
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|
Response Time(T90) |
≤50s |
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Working Temperature |
-20oC~+50oC |
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Preheating Time |
No preheating |
20min |
40min |
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Sample Gas Interface |
Φ6 Bi-Lok |
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Sample Gas Flow |
Range: (0.5~2)L/min, fluctuation<25% |
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|
Sample Gas Pressure |
Current ambient pressure ±0.1Bar |
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Sample Gas Temp. |
0oC~+50oC |
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Sample Gas Humidity |
No condensation (under sample gas temperature) |
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4-20mA Input |
3 , configurable, 100Ω load |
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4-20mA Output |
5, output content can be configured, maximum load capacity ≤800Ω |
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Switching value Input |
6 , configurable |
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Relay Output |
14, output content can be configured. DC30V2A |
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Digital I/O |
1×Rs232, 1×Rs485 (Support Modbus protocol) |
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Installation Method |
19’ panel |
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Supply Voltage |
220VAC±10% |
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Rated Power |
About 100W |
About 120W |
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