Oxygen Compound Instruments
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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


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

Particulate FilterReplaceWeekly or as neededYes10.3.1
Verify Test FunctionsRecord and analyzeWeekly or after any Maintenance or RepairNo11.1.2
Pump DiaphragmReplaceAs NeededYes- -
O3 Reference ScrubberReplaceEvery 2-5 years, as neededYes11.10.2
Zero Air Scrubber
(Option 56)
ReplaceRegularly as neededNo10.3.4
Absorption Tube InspectAnnuallyYes10.3.7
CleanAs Needed
Flow CheckPerform Flow CheckEvery 6 MonthsNo10.3.6
Leak CheckPerform Leak CheckAnnually or after any Maintenance or RepairYes10.3.5
Pneumatic linesExamine and cleanAs neededYes if cleaned- -


ESD Fundamentals - 04786.pdfFundamentals of Electro-Static Discharge (ESD)216 KB
NVS Remote Manual - 08492.pdfNumaView™ Software Remote User Guide867 KB
SAL000061I - T400.pdfT400 Specification843 KB
SAL000061I-CN T400.pdfT400规格 (Chinese Specification)1334 KB
SAL000076H - Environmental Instruments Overview.pdfEnvironmental Instruments Overview614 KB
T SERIES_6PG.BROCHURE_2018_web.pdfT Series with NumaView™ Software Brochure9567 KB
T400 Manual - 06870.pdfT400 Manual10063 KB
T400 NVS Manual-083730400.pdfT400 with NumaView™ Software Manual12476 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 MC050070/08
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.