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AQMS-700 CAPS NO2 Analyzer

Product Summary:

AQMS-700 CAPS NO2 analyzer is an atmospheric environment monitoring instrument based on the optical cavity attenuation phase shift technology (CAPS) which can directly measure the NO2 concentration in the ambient air and is widely used in the online monitoring of the NO2 content in the ambient air quality monitoring scene.

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Product overview Product features Application area
Product overview

AQMS-700 CAPS NO2 analyzer is an atmospheric environment monitoring instrument based on the optical cavity attenuation phase shift technology (CAPS) which can directly measure the NO2 concentration in the ambient air and is widely used in the online monitoring of the NO2 content in the ambient air quality monitoring scene.


The analyzer is mainly composed of pre-processing module, resonant cavity module, flow control module, circuit module, etc., and will measure the gas concentration according to the phase difference between the beam in the reference cavity and the cavity with NO2. The LED beam is modulated by high frequency signal and coupled into the optical cavity composed of high-reflection mirror. Then, beam is reflected repeatedly in the cavity and is absorbed by NO2 in the cavity. The absorbed beam is collected by the detector after passing through the optical cavity and the optical filter. The detector converts the optical signal into electrical signal, then demodulates it by electrical heterodyne method, and finally obtains the signal with phase information.


Range 


0~500ppb to 0~1000ppb,

Optional dual range and auto range                                   

Диапазон измерения
0~500ppb до 0~1000ppb Дополнительный двойной диапазон и авто диапазон

Measurement Units

ppb, ppm, μg/m3 , mg/m3 (optional) 

Единицы измерения
ppb, ppm, μg/m3 , мг/м3 (необязательно)

Lower Detectable Limit

≤0.2ppb(RMS)

Минимальный предел обнаружения
≤0.2ppb(RMS)

Zero Noise

≤0.1ppb(RMS)

Нулевой шум
≤0.1ppb(RMS)

Span Noise

≤0.5%F.S.

Пролетный шум
≤0.5%F.S.

Indication Error

±1%F.S.

Ошибка индикации
±1%F.S.

Precision(20%) 

≤1% Reading value

Точность диапазона(20%)
≤1% Значение чтения

Precision(80%)

≤1% Reading value

Точность диапазона(80%)
≤1% Значение чтения

Product features
  • Adopt ultra-high reflector, low detection limit;
  • Direct measurement, without reagent or catalytic conversion, low maintenance;
  • Strong anti-interference ability;
  • Simple structure and parts;
  • Strong system stability, low power consumption;
  • Fast response time;


Application area

• Atmospheric background station, urban environment and other conventional monitoring; 

• Laboratory ultra-high requirement monitoring; 

• NO2 concentration monitoring in special areas such as hospitals;

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