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​Model T265
with NumaV​iew™ Software

Chemiluminescence O3 Analyzer




  • Ranges: 0-100 ppb to 0-2,000 ppb, user selectable
  • Independent ranges and auto ranging
  • Large, vivid, and durable color graphics display with touch screen interface
  • Ethernet, RS-232, and (optional) USB com ports
  • Front panel USB connections for peripheral devices and firmware upgrades
  • 8 analog inputs (optional)
  • Adaptive signal filtering optimizes response time
  • Temperature & pressure compensation
  • Comprehensive internal data logging with programmable averaging periods
  • Ability to log virtually any operating parameter
  • Two-year warranty
  • US EPA Federal Reference Method (RFOA-0216-230)​


08296D - Addendum,  NumaView(TM)Software-for-Analyzers.pdfNumaView™ Software Addendum for Analyzers7097 KB
22-002A REST API Tutorial For Numaview Instruments - O2.pdfREST API Tutorial for NumaView Instruments584 KB
Comparison of ozone measurement methods in biomass burning smoke.pdfComparison of ozone measurement methods in biomass burning smoke: an evaluation under field and laboratory conditions1690 KB
ESD Fundamentals - 04786.pdfFundamentals of Electro-Static Discharge (ESD)216 KB
NVS Remote Manual - 08492.pdfNumaView™ Software Remote User Guide867 KB
SAL000052G - T265.pdfT265 Specification403 KB
SAL000052H-CN T265.pdfT265规格 (Chinese Specification)917 KB
SAL000076K - Environmental Instruments Overview.pdfEnvironmental Instruments Overview610 KB
T SERIES_6PG.BROCHURE_2018_web.pdfT Series with NumaView™ Software Brochure9567 KB
T265 Manual Addendum_07337.pdfT265 Manual3684 KB


Ranges Min: 0-100 ppb full scale
Max: 0-2,000 ppb ​full scale (selectable, dual range supported)
Measurement Units ppb, ppm, μg/m3, mg/m3 (selectable)
Zero Noise < 0.15 ppb (RMS)
Span Noise < 0.5% of reading (RMS) above 100 ppb
Lower Detectable Limit < 0.3 ppb
Zero Drift < 0.5 ppb/24 hours
Span Drift < 0.5% of full scale/24 hours
Response Time < 30 seconds to 95%
Linearity 1% of full scale
Precision 0.5% of reading
Sample Flow Rate 500 cc/min ±10%
Power Requirements 100V-120V, 220V-240V, 50/60 Hz, Typical power 150W
Analog Output Ranges 10V, 5V, 1V, 0.1V (selectable)
Recorder Offset ±10%
Included I/O 1 x Ethernet: 10/100Base-T
2 x RS232 (300-115,200 baud)
2 x USB device ports
8 x opto-isolated digital outputs
6 x opto-isolated digital inputs
4 x analog outputs
Optional I/O 1 x USB com port
1 x RS485
​​4 x digital alarm outputs
Multidrop RS232
3 x 4-20mA current outputs
Operating Temperature Range 5 - 40ºC (with US EPA Approval)
Dimensions (HxWxD) 7” x 17” x 23.5” (178 x 432 x 597 mm)
Weight 40 lbs (18.1 kg)

Specifications are subject to change without notice.
All specifications are based on constant conditions.​
US EPA Federal Reference Method: RFOA-0216-230
US EPA Federal Equivalent Method: EQOA-0611-199​​​​


The Model T265 uses Chemiluminescence with Nitric Oxide (NO) as a reagent, making it safe, stable, and effective for all applications. The NO-CL method for Ozone has several advantages​ over the conventional UV absorption technology, including the avoidance of positive and commonly found interferences such as VOCs, fine particulates, Mercury, terpenes, ClO2 and others. If these pollutants are present in the atmosphere, it can cause UV absorption analyzers to give an artificially high ozone measurement. The innovative T265 combines speed of response, sensitivity and stability of our proven nitrogen oxide analyzer, with a simple user interface, to provide reliable ozone measurements under the harshest conditions.

An inexpensive external cylinder of NO provides over one year of reagent for the T265.  A unique AutoZero feature provides superb stability by continuously correcting for zero drift, while advanced Adaptive Filtering allows the analyzer to optimize performance under changing conditions.  Optional zero and span valves allow automatic, unattended calibration checks.

All T Series instruments offer an advanced color display, capacitive touch screen, intuitive user interface, flexible I/O, and built-in data acquisition capability.  All instrument set up, control and access to stored data and diagnostic information is available through the front panel, or via RS232, Ethernet, or USB com ports, either locally or by remote connection.

The Model T265 comes with NumaView™ Software.  NumaView™ Remote PC Software allows for a remote connection with virtual interface and data downloading capability to analyzers operating NumaView™ Software.