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​Model T400
with NumaV​iew™ Software

UV Absorption O3 Analyzer​



  • Ranges: 0-100 ppb to 0-10 ppm, user selectable
  • Single pass ultraviolet absorption
  • Selectable ranges, with dual range capability
  • 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
  • Internal programmable zero, span and precision points (optional)
  • Comprehensive internal data logging with programmable averaging periods
  • Ability to log virtually any operating parameter
  • Two-year warranty


22-002A REST API Tutorial For Numaview Instruments - O2.pdfREST API Tutorial for NumaView Instruments584 KB
ESD Fundamentals - 04786.pdfFundamentals of Electro-Static Discharge (ESD)216 KB
NVS Remote Manual - 08492.pdfNumaView™ Software Remote User Guide867 KB
SAL000061J - T400.pdfT400 Specifications826 KB
SAL000061J-CN - T400.pdfT400规格 (Chinese Specification)1324 KB
SAL000061K-CN T400.pdfT400规格 (Chinese Specification)5214 KB
SAL000076K - Environmental Instruments Overview.pdfEnvironmental Instruments Overview610 KB
T SERIES_6PG.BROCHURE_2018_web.pdfT Series with NumaView™ Software Brochure9567 KB
T400 MANUAL, USER, NVS, T400 083730400B.pdfT400 with NumaView™ Software Manual11634 KB


Min: 0 - 100 ppb full scale
Max: 0 - 10,000 ppb full scale (selectable, dual-range supported)
Measurement Units ppb, ppm, μg/m3, mg/m3 (selectable)
Zero Noise < 0.2 ppb (RMS) *
Span Noise < 0.5% of reading (RMS) above 100 ppb
Lower Detectable Limit < 0.4 ppb *
Zero Drift < 1.0 ppb/24 hours
Span Drift < 1% of reading​​/24 hours
Response Time < 30 seconds to 95%
Linearity 1% of full scale
Precision 0.5% of reading above 100 ppb
Sample Flow Rate 800 cc/min ±10%
Power Requirements

100V-120V, 220V-240V, 50/60 Hz

Analog Output Ranges

10V​, 5V, 1V, 0.1V (selectable)

​IZS Specifications (optional)  

​Maximum Concentration: 1.0 ppm
Minimum Concentration: 0.050 ppm
Resolution: 0.5 ppb
Repeatability (7 days): 1% of reading
Initial accuracy: ± 5% of target
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)

28 lbs (12.7 kg) / ​30.6 lbs (13.8 kg) with IZS

​US EPA EQOA-0992-087
EU: EN14625 TÜV Rheinland
QAL1 Certified: EN15267
MCERTS: Sira MC 050070/09​
CNEMC: 质(认)字 No. 2015-028 Report

* with 80 Sample Digital Filter​

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



The Model T400 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.

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 T400 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.