Chemiluminescence 0³

with NumaView™ Software

The Model T265 is the only commercially available US EPA Federal Reference Method for Ambient Ozone Monitoring according to the latest US EPA regulatory rules for O3


The Model T265 is the only commercially available US EPA Federal Reference Method for Ambient Ozone Monitoring according to the latest US EPA regulatory rules for O3. The instrument 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 interferrents 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. 

  • 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)

  • 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%
  • 1% of full scale
  • 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)
  • 40 lbs (18.1 kg)
  • US EPA Federal Reference Method: RFOA-0216-230
  • US EPA Federal Equivalent Method: EQOA-0611-199

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

The following table provides a list of items that need regular maintenance to ensure your product remains in good working condition.

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