Model T500U
​with NumaView™ Software

CAPS Trace-level NO2 Analyzer




  • True, Direct NO2 measurement
  • Extended maintenance interval
  • No converter or reagent required
  • No known ambient air interferences
  • Fast response
  • Exceptional measurement sensitivity
  • Low power consumption
  • Ranges: 0-5 ppb to 0-1 ppm, user selectable
  • Adaptive signal filtering optimizes response time
  • Temperature & Pressure compensation
  • All standard T-Series platform features
  • Two-year warranty


083730510C - MANUAL, USER, NVS, T500U CAPS NO2.pdfT500U with NumaView™ Software Manual8200 KB
22-002A REST API Tutorial For Numaview Instruments - NOX.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
SAL000076K - Environmental Instruments Overview.pdfEnvironmental Instruments Overview610 KB
SAL000078J - T500U.pdfT500U Specifications826 KB
SAL000078K-CN T500U.pdfT500U规格 (Chinese Specification)789 KB
SAL000082D - T500U Brochure.pdfT500U Brochure6871 KB
T SERIES_6PG.BROCHURE_2018_web.pdfT Series with NumaView™ Software Brochure9567 KB


Min: 0 - 5 ppb​ NO2
Max: 0 - 1,000 ppb NO2
Measurement Units
ppb, ppm, μg/m3, mg/m3 (selectable)
Zero Noise
< 20 ppt (RMS)
Span Noise
< 0.1% of reading (RMS) + 20 ppt
Lower Detectable Limit < 40 ppt
Zero Drift
< 0.1 ppb / 24 hours
Span Drift
​< 0.5% of reading / 24 hours
Response Time < 40 seconds to 95%
1% of full scale
Precision 0.5% of reading above 5 ppb
Sample Flow Rate
900 cc​/min ±10%
Power Requirements 100-250VAC (50-60Hz); Typical power 80W​
Analog Output Ranges 10V, 5V, 1V, 0.1V (selectable)
Recorder Offset
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 - 40°C (with US EPA Approval)
Dimensions (HxWxD) 7” x 17” x 23.5” (178 x 432 x 597 mm)
33 lbs (15kg)
​ Certifications
​US EPA: Federal Equivalent Method (EQNA-0514-212)
EU: EN14211 TÜV Rheinland​
QAL1 Certified: EN15267​​
MCERTS: Sira MC 160304/01​
Specifications are subject to change without notice.
All specifications are based on constant conditions.​



The T500U CAPS NO2 Analyzer represents the next generation of criteria pollutant monitoring technology for the direct measurement of Nitrogen Dioxide (NO2) in air. The instrument utilizes a patented Cavity Attenuated Phase Shift (CAPS) technique to provide an extremely sensitive, fast and accurate NO2 measurement in a cost effective and low maintenance instrument package.

The T500U provides a direct NO2 measurement, eliminating the need for catalytic conversion or reagents which introduce measurement artifacts inherent in traditional heated metal converter based chemiluminescence instruments. The CAPS measurement approach also reduces maintenance items, and removes the nee​d for hazardous materials and high temperature scrubbers within the instrument. The T500U has an expec​​​ted maintenance interval of one year under typical ambient monitoring conditions.

All T Series instruments offer an advanced color display, capacitive touch screen, intuitive user interface, flexible I/0, 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 T500U 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.