Online Flue Gas Analyzer

Vasthi Instruments are global leaders in manufacturing of Flue Gas Analyzer and have been supplying instruments to customers worldwide, Our multidisciplinary team of scientists, physicians, engineers, and regulatory consultants with decades of global experience brings you the quintessential mechanism that provides complete safety accuracy and durability.
Vasthi Instruments was formed with visionary thinking and innovative ideas resulting in innovative products and solutions. We enhance our product quality by the continuous process of research and development. We have WIDE range of models to suite various site conditions and processes.



Online Flue gas analyzers are independently developed by Vasthi for domestic overseas environmental and industrial control site Monitoring online analysis. Based on DOAS and chemo metric algorithm, flue gas analyzer can measure SO2, NO, NO2, O2, NH3, CL2, O3, H2S etc., It can be widely used in environmental online monitoring, industrial process controlling, safety monitoring, etc..
Vasthi Flue gas analyzer applies UV DOAS technology. The optical technology consists of light sources, gas chamber, optical and spectroscopic and other optical components. flue gas analyzer has minimum detection limit of SO2, NO, NO2 can be 1mg/m(15m optical path). NO and No2 can be measured at the same time, dispense with converter and low detection limit. Flue gas analyzer has small amount of zero drift and span drift. It has Natural Gas Purification process.


High Measurement Accuracy   

The minimum detection limit of S02, NO, NO2, can be 1mg/m’    (15m 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

  • Small amount of zero drift and span drift.
  •  Modular design.
  • No optical moving parts and no vibration  influence.
  • Strong gas cell  ,low cost
  • Spectrum automatic  adjustment   technology, long free maintenance   cyc|e.
  • Light source adopts the pulse source, the service life is10 years.


  1. OMGA-2000S
  2. OMGA-2000L
  3. OMGA-2000UL


Model OMGA-2000 S OMGA-2000L      OMGA-2000UL
Measurement Principle                                                             DOAS+PLS
Typical detecting gases Min. Max. Min. Max Min. Max



SO2 0~300ppm 0~300ppm 0~100ppm 0~300ppm 0~20ppm 0~100ppm
NO 0~300ppm 0~300ppm 0~100ppm 0~300ppm 0~20ppm 0~100ppm
NO2 0~1500ppm 0~15000ppm 0~500ppm 0~1500ppm 0~20ppm 0~500ppm
O2 0~5% 0~25% 0~5% 0~25% 0~5% 0~25%
Linearity ≤±1.5% F.S
Repeatability 0.5%
Zero drift ≤±2%F.S./7d
Span drift ≤±2%F.S./7d
Response time(T90)      <10s <10s <10s
Working Temperature -20°C~+50°C
Preheating Time No preheating Approx.10 min
Sample Gas Interface Ø6Bi-Lok
Sample Gas Flow (0.5~2) L/min, Fluctuation<25%
Sample Gas Pressure The current environmental pressure±0.1 Bar
Sample Gas Temperature 0°C~+50°C
Sample Gas Humidity No condensation (under sample temperature)
4-20 mA Input Interface 3.configurable,100 Ω Load
4-20 mA Output Interface 5, Output can configured, Maximum load capacity≤800Ω
Switched Input Interface 6, configurable
Relay Output Interface 14, output can be configured. DC 30V 2A
Communication Interface 1XRS232,1XRS485(Support the Modbus protocol)
Installation Installed in 19inch cabinet
Supply 220VAC±10%
Power About 100W                                         About 200W
Dimension 132(H)X483(W)X378(D)mm 177(H)X483(W)X412(D)mm   177(H)X483(W)X434(D)mm
Weight About 10 Kg                                        About 12 Kg