Currently experiencing very long- and uncertain lead times for all N500 components, please consult factory.

Model N500
CAPS True NO2-NOX-NO Analyzer
with NumaView™ Software​​



08977C - MANUAL, USER, 500 CAPS NOX.pdfN500 with NumaView™ Software Manual11651 KB
22-002A REST API Tutorial For Numaview Instruments - NOX.pdfREST API Tutorial for NumaView Instruments584 KB
NVS Remote Manual - 08492.pdfNumaView™ Software Remote User Guide867 KB
SAL000076K - Environmental Instruments Overview.pdfEnvironmental Instruments Overview610 KB
SAL000106D - N500.pdfN500 Specifications1020 KB
Teledyne API N Series Ambient Brochure_17-Dec-2021.pdfN Series Instruments for Ambient Air Monitoring Brochure11385 KB



​​​ Ranges
​Min: 0-5 ppb full scale
Max: 0-1,000 ppb full scale​
​ Measurement Units
​ppb, ppm, μg/m3, mg/m3 (user-selectable)​
 Zero Noise
< 0.05 ppb (RMS)
 Span Noise
< 0.2% of reading + 50 ppt (RMS)
 Lower Detectable Limit < 0.1 ppb
 Zero Drift
< 0.2 ppb / 24 hours
 Span Drift
​< 0.5% of reading / 24 hours
 Response Time < 60 seconds to 95%
1% of full scale
 Precision 0.5% of reading above 5 ppb
 Sample Flow Rate
1000 cc/min ±10%
 Power Requirements 100-240VAC (50-60Hz), Typical power 110W
 Included I/O 1 x Ethernet (TCP/IP)
1 x RS232​
2 x front panel USB device ports
 Optional I/O Universal Analog Output Board includes (all user-definable):
4 x Isolated Voltage Outputs (5V, 10V; user-selectable)
3 x Individually Isolated Current Outputs (4-20mA)
​Digital I/O Expansion Board includes:
3 x Isolated Digital Input Controls
5 x Isolated Digital Output Controls (user-definable)
3 x Form C Relay Alarm Outputs (user-definable)
 Operating Temperature Range
0 - 40°C (with US EPA approval)​
 Dimensions (HxWxD) 7” x 17” x 23.5” (178 x 432 x 597 mm)
33 lbs (15kg)
​USA EPA Federal Equivalent Method EQNA-0320-256

​​Specifications subject to change without notice.
All specifications are based on constant conditions.


  • ​Ranges: 0-5 ppb to 0-1 ppm, user-selectable
  • True NO2 – NOx – NO measurements
  • Gas Phase Titration (GPT) for NO conversion and measurement
  • Large, vivid, and durable color graphics display with touch screen interface
  • Ethernet TCP/IP, RS-232​ serial
  • Front panel USB connections for peripheral devices and firmware upgrades
  • Analog output and Digital I/O expansion (options)
  • Fast response compared to Chemiluminescence
  • Exceptional measurement sensitivity
  • Low power consumption
  • Extended maintenance interval
  • Adaptive signal filtering optim​izes response time
  • Temperature & Pressure compensation
  • NumaView Software a​nd NumaView Remote Operating Software
  • Two-year warranty​


The Model N500 CAPS NOx analyzer uses superior Cavity Attenuated Phase Shift (CAPS) Spectroscopy to measure True NO2, NOx, and NO gases. The instrument combines direct NO2 measurements with highly efficient gas phase titration (GPT) to convert and measure the NO gas component. An automatic baseline reference cycle accounts and compensates for any potential baseline drift due to varying environmental conditions. 

​CAPS technology is inherently accurate and sensitive, uses very little power, and requires far less maintenance than Chemiluminescence. The Model N500 raises the bar for NO2, NOx, and NO measurement accuracy, while simultaneously reducing instrument operation and maintenance costs. 

Instrument functions and controls are managed through a series of integrated microprocessor-controlled modules utilizing a simple and reliable CAN Bus communications architecture. Each module is independently assembled and calibrated allowing easy and fast field replacement to maximize instrument uptime. The long-life sample filter further improves efficiency with a ~6 months exchange interval in ambient air quality monitoring applications.

Intuitive operation and calibration of all N Series products is achieved through the NumaView™ Software interface. The graphical user interface (GUI) is customizable, giving the user fast and efficient access to instrument status, as well as measurement data and diagnostic parameters in either numeric or graphical form. NumaView™ Remote Software (included at no charge) provides the same virtual interface and complete instrument control, as well as access to the instrument’s large internal data storage buffer from a remote PC or tablet​​.