DOAS System for High-Sensitivity Multi-Gas Monitoring and Accurate Industrial & Environmental Analysis – GAOTek

Description Overview Differential Optical Absorption Spectroscopy (DOAS) is a versatile broadband technique for continuous multi-gas monitoring. By measuring differential absorption across wide wavelength ranges, it detects gases from ppbv levels to very high concentrations. DOAS corrects for spectral overlap and interference, enabling accurate and reliable analysis of pollutants such as NO, SO₂, NH₃, and HCHO in industrial and environmental applications.    Features High Measurement Accuracy  The minimum detection limit of SO2, NO, NO2 can be 1mg/m3 (15 m optical path)  Ultraviolet has no moisture absorption: undisturbed by moisture and dust.  No cross interference between the gas being measured  NO and NO2 can be measured at the same time, dispense with converter.  Low detection limit.  High Reliability  DOAS PLS technology, small amount of zero drift and span drift  Modular design  Available version with external UV bench for use with toxic or corrosive gases.  No optical moving parts and no vibration influence.  Strong gas cell, low cost.  Spectrum automatic adjustment technology, long free maintenance cycle  Light source adopts the pulse source  European Compliance  Low Voltage Directive 2014/35/EU  EMC Directive 2014/30/EU  Measurable Gases Nitric Oxide [NO], Oxygen [O2], Chlorine [Cl2], Nitrogen Dioxide [NO2], Carbon Monoxide [CO], Hydrogen Sulphide [H2S], Sulfur Dioxide [SO2], Ammonia [NH3], Methane [CH4].     Technical Specifications Parameters  Details  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 to 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 to 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.