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​Model N4​00
UV Absorption O3 Analyzer​​​
with NumaView™ Software​


092910400D- MANUAL, USER, N400.pdfN400 with NumaView™ Software Manual11117 KB
22-002A REST API Tutorial For Numaview Instruments - O2.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
SAL000121B - N400.pdfN400 Specifications432 KB
Teledyne API N Series Ambient Brochure_17-Dec-2021.pdfN Series Instruments for Ambient Air Monitoring Brochure11385 KB


Measurement Units
​ppb, ppm, μg/m3, mg/m3 (selectable) 
​​​ Response Time
​< 30 seconds to 95%​

Min: 0 - 100 ppb full scale
Max: 0 - 10,000 ppb full scale (selectable, dual-range supported)
Sample Flow Rate 800 cc/min ±10%
Zero Noise < 0.2 ppb (RMS)*
Span Noise < 0.5% of reading (RMS) above 100 ppb
Lower Detectable Limit
< 0.4 ppb*

< 0.5% of reading above 100 ppb

​​ Linearity
​1% of full scale
Zero Drift
< 1.0 ppb/24 hours
Span Drift < 1% of reading/24 hours
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)​
28 lbs (12.7 kg)
30.6 lbs (13.8 kg) with IZS Option​

​Dimensions (HxWxD)
​7” x 17” x 24.3” (178 x 432 x 617 mm)
Operating Temperature 0 - 45°C (with US EPA Approval)

​​​ Power
100V-240V, 50/60 Hz, Typical consumption 40​W​

​​​​ Certifications
*with 80 Sample Digital Filter​

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

​US EPA: EQOA-0992-087​​



  • Customizable alerts and continuous self-checking​
  • Wide operating temperature range
  • Single pass ultraviolet absorption
  • Adaptive signal filtering optimizes response time​
  • Internal DC-powered vacuum pump​
  • Internal zero/span valves and IZS (optional)
  • Optional 47mm membrane or long-​life sample particulate filter


The Model N400 Ultraviolet (UV) Absorption analyzer uses a system based on the Beer-Lambert law for measuring low ranges of ozone in ambient air. 

A 254 nm UV light signal is passed through the sample cell where it is absorbed in proportion to the amount of ozone present. Periodically, a switching valve alternates measurement between the sample stream and a sample that has been scrubbed of ozone. The result is a true, stable ozone measurement. 

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 option further improves efficiency with a ~6 month 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.​