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| After-sales Service: | 1 Year |
| 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 (time-shared monitoring of the species; e.g., NO, NO2, HCHO etc.).
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UV Light source
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Broadband Pulsed or Continuous Wave light emission source
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Detection Limits
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NO < 0.2ppm-m
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SO2 < 10ppb-m
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NO2 < 0.3ppm-m
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Calibration
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Factory Test results sent with every unit, in‐line flow through cell option available
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Dynamic Range
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5 orders of magnitude
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Data Logging and Displaying Software
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Internal storage & External storage via Ethernet or MODBUS-TCP
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Response Time
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< 1 second
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Environment Conditions
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‐10°C to +50°C, 5 – 95% RH, 800 – 1,200 mbar
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Outputs and Networking
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Up to thirty-two 4‐20mA Analog Outputs, Ethernet, MODBUS-TCP/RTU, Six Dry-Contact NC & NO Status Relays
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Data Logging and Displaying Software
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LasIRView (with Data Review and Statistical Analysis)
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Power Supply
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Input 100 – 240 VAC @50‐60Hz
+12VDC |
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* Principle : UV DOAS
* The minimum detection limit of SO2 , NO, NO2 can be 1mg/m3
* Ultraviolet has no moisture absorption, undisturbed by moisture and dust
* No cross interference between the gas being measured
* Low detection limit
* NO and NO2 can measure at the same time, dispense with converter
* No optical moving parts and no vibration influence
* Strong gas cell, low cost
* Spectrum automatic adjustment technology
* Parameters: SO2 , NO, NO2 , O2 , NH3 , CO, CO2 , Cl2 , O3 , H2 S, HCl, CH2 I.
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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