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| Warranty: | 1 Year |
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Differential Optical Absorption Spectroscopy or DOAS, is based on the principle of measuring the differential absorption of the incoming signal in the wavelength region of interest after it has passed through a gas medium. It uses a broadband light source and the measurement is made over a large wavelength range (like FTIR and NDIR, and unlike TDL that uses a very narrow wavelength range). In general, overlap of absorption features of several gases is observed. This requires the use of multiple regression methods of analysis. The concentrations of a gases are calculated by comparing the absorption signals with their stored reference signals. As in any broadband measurement technique, interference from other gases must be taken into account and corrected for to improve accuracy of measurement. This requires a prior knowledge of the gas composition before the final measurements can be made. DOAS is capable of measuring more than one species which either absorb in the same wavelength region (continuous monitoring of the species; e.g., NO, NH3, SO2 etc.) or in different wavelength regions (timeshared monitoring of the species; e.g., NO, NO2, HCHO etc.).
| Model | Multi-Flue-S (standard) | Multi-Flue-LE (Low Emission) | Multi- Flue-ULE (UltraLow Emission) |
| Measuring Principle | UV DOAS + PLS (all the gas); Electrochemical (O2); Laser (CO) |
| Linearity | ≤ ±1.5% FS |
| Repeatability | ≤ ±0.5% FS |
| Zero & Span Drift | ≤ ±2% FS |
| Response time (T90) | < 10 sec. | < 30 sec. | < 30 sec. |
| Working Temperature | -10.C … .+40.C |
| Warmup Time | No pre-heating | Approx. 10 min. |
| Sample Gas Interface | Ø6 Bi-lok |
| Atmospheric pressure effect: | ± 0.13% of reading per mmHg. |
| Sample Gas Flow | 0.5…2 l/min., Fluctuation < 25% |
| Sample Gas Pressure | The current environmental pressure ±0.1 Bar |
| Sample Temperature | 0.C … .+50.C |
| Sample Gas Humidity | Non condensation (under sample temperature) |
| 4-20 mA Input Interface | 3 x configurable, max. load 100 Ω |
| 4-20 mA Output Interface | 5 x configurable, max. load < 800 Ω |
| Switch Input Interface | 6 x configurable |
| Relay Output Interface | 14 x configurable, 30 VDC, 2A |
| Communication Interface | 1 x RS232, 1x RS 485 (ModBus) |
| Installation | Rack 19" |
| Supply | 100...240 VAC |
| Power | ~ 100W | ~ 200W |
| Outline Dimensions | 132(H) x 483(W) x 378(D) mm | 177(H) x 483(W) x 412(D) mm | 177(H) x 483(W) x 412(D) mm |
| Weight: | ~ 10 Kg. | ~ 12 Kg. |
Beijing Zetron Technology Co., Ltd, formerly Beijing Senre Technology Co., Ltd was founded in 2011, located in Beijing with convenient transportation access. We have almost 12 years experience in the retail, import and export of gas detection and monitoring equipment.
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