Ambient Sulphur Dioxide Analyzer

Vasthi Instruments are global leaders in manufacturing of Ambient Sulphur Dioxide 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.


Ambient Sulphur Dioxide Analyzer using Ultraviolet fluorescence principle, combined with the most advanced microprocessor technology provides accurate, reliable low ppb-ppm levels of SO2, suitable for atmospheric monitoring and dilution of pollution online monitor application.

Work is the basic principle of UV fluorescence method for Ambient Sulphur Dioxide Analyzer. SO2 reception of ultraviolet energy excited state molecules return to ground state, issued a characteristic fluorescence, fluorescence intensity of material can be quantitatively measured. Through the use of regular measurement of dark current compensation enlarger PM d drift and corrected using the reference detector UV lamp intensity change, and improve the stability of measurements. Removal And unique optical design of efficient hydrocarbon removal effectively eliminates inaccuracies created by interference.

Ambient Sulphur Dioxide Analyzer has full control over all the functions of this instrument at the same time, can also provide important operating parameters of online instruction. During the measurement, real-time automatic compensation of the temperature and pressure changes.


  • Measuring range 0-50 ppb to 0-20 ppm, User-selectable
  • Dual range and auto-range microprocessor multi-function operation
  • Software allows monitoring data during the operation continuous detection with alarm light
  • Attenuation self-test feature bi-directional RS-232 side
  • With alarm function for continuous self test feature bi-directional light attenuation
  • RS-232 port for remote control
  • Digital output the instrument parameters
  • Adaptive signal filtering techniques optimize response time
  • With temperature and pressure compensation with USB and Ethernet interfaces    
  • Color display, touch screen operation
  • Large-capacity memory automatically stores historical data
  • Model: V.AIR – 9001




Concentration Units

ppb, ppm, ug/m3, mg/m3

Zero noise

0.2 ppb

Quantum noise

0.5% ppb or 0.2 ppb or more

Detection limit

0.4 ppb

Zero drift (24h)

1 ppb

Zero drift (7 days)

<1 ppb

Span drift (7 days)

<1 % F.S.


<1% F.S.



Response time

<120s to 95%

Sample gas flow

(400 ± 50) sccm

Operating temperature range

(5 – 40)°C

Operating humidity range

(0 – 95)% RH

Instrument size


Instrument weight

<20 KG

Power supply

200-240V, 50/60Hz, 300W


Analog outputs, digital output, R232, R485, Ethernet interface, USB interface

Communication protocol