AS32M CAPS Nitrogen Dioxide Analyzer NO₂


Gas monitor for fast, precise, direct and continuous measurement of NO2 concentrations in the range 0-1000 ppb

Visible (450 nm) absorption measurement using patented Cavity Attenuated Phase Shift (CAPS) technology. QAL1 certified by the TÜV, US-EPA approved
• Fast and direct measurement of the sample – no chemical conversion required, no Toxic Gas Emissions”

  • Brand


Envea Ambient


  • Essentially interference-free, insensitive to high fluctuations of nitric oxide, aerosols, humidity and other trace atmospheric species
  • Ideal for a wide variety of monitoring application where accuracy, precision and fast response are required
  • Extremely compact, easy to use with minimal maintenance
  • Built-in USB port, serial interface (RS 232 / RS 422) and TCP-IP connection
  • Real-time calibration graph, animated synoptic, control and maintenance data screens can be displayed while the instrument is operating
  • Cost-saving analyzer with ultra low power consumption, 24 V supply (option) and able to withstand temperatures up to 45-50 °C without air conditioning
  • Includes embedded Communication Protocol for XR® Management with automatic recognition & configuration
  • SmartStatusLightTM power button on the front panel indicating status of operation (ON/OFF, Alarm, Maintenance required…)


Technical specifications
Measured parameter NO
Technology CAPS (Cavity Attenuated Phase Shift Spectroscopy)
US-EPA Approval / QAL 1 Certification YES
Measurement ranges 0-1 ppm
Measurement units ppb, ppm, µg/m3 (user-selectable)
Lower Detectable Limit (2σ) 0.1 ppb
Noise (σ) 0.05 ppb
Zero drift 0.75 ppb/24h
Span drift 1.5 ppb/12h
Linearity < 4%
Sample flow rate 1L/min
Sampling pump Internal
Temperature range +10°C to 35°C
Data storage 1 year
Included I/O 1 LAN / 1 USB / WIFI / 1 RS4i board
Weight (Kg) 12.5
Dimensions mm (LxWxH) 483 x 606 x 133
Chassis 19″ Rack, 3U
Power supply ‘100~250Vac, 50/60Hz + ground


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