Ambient Oxides of Nitrogen Analyzer

Vasthi Instruments are global leaders in manufacturing of Ambient Oxides of Nitrogen 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 Oxides of Nitrogen Analyzer using chemiluminescence detection principle, combined with the most advanced microprocessor technology provides accurate and reliable low NOx detection of ppb-ppm level, suitable for atmospheric monitoring and dilution of pollution online monitor application.

Nitric oxide work is the basic principle of chemiluminescence Analyzer. 03 and NO reaction after the absorption of chemical energy, is inspired to the excited state, and excited when you return to the ground state, and release energy in the form of photons. Chemiluminescence intensity is proportional to the concentration of gas can be quantitative measurement of material.

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-delectable
  • Independent measurement NO, NO2, NOx
  • Microprocessor realisation of multi-function operation
  • Software allows monitoring during the operation to test data
  • Continuous belt alarm post
  • Ozone generator is provided with a penetration drying tube bi-directional
  • Rs-232 port for remote control
  • Digital output the instrument parameters                                            
  • Adaptive signal filtering techniques optimise 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 – 9002






Min:  0-50 ppb       

Max:  0-20 ppm       

automatic range switching                                                                             

Concentration Units

ppb, ppm, ug/m3, mg/m3

Zero noise

The core 0.2 ppb

Quantum noise

0.5% ppb or 0.2 ppb or more

Detection limit

0.4 ppb

Zero drift (24h)

Core 0.5 ppb

Zero drift (7 days)

<1 ppb

Span drift (7 days)

<1 % F.S.


<1% F.S.



Response time

<90s to 95%

Sample gas flow

(400 ± 50) sccm

Operating temperature range

(5 – 40)°C

Operating humidity range

(0 – 95)% RH

Instrument size


Instrument weight

<18 KG

External pump weight

<7 KG

Power supply

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


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

Communication protocol