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 ​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


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




Cal Check Required

Test Functions

Review and evaluate



Zero/Span Check

Evaluate offset and slope



Zero/Span Calibration

Zero and span calibration

Every 3 months


Sample Filter

Change sample filter

Annually (may need more frequently in a high dust load environment)


AREF Filter and Charcoal Filter

Change both



Spectrometer Mirrors

Contact Technical Support

As necessary due to excessive Measured Loss


Pneumatic sub-system

Check for leaks in gas flow paths

Annually or after repairs involving pneumatics

Yes if a leak is repaired

Internal Pump


Measured Flow less than 800 cm3/min



07834D - Manual, T500U.pdfT500U Manual5606 KB
SAL000082D - T500U Brochure.pdfT500U Brochure6871 KB
T SERIES_6PG.BROCHURE_2018_web.pdfT Series with NumaView Brochure9567 KB
T500U_datasheet.pdfT500U Specification1296 KB


Ranges 0 - 5 ppb to 0 - 1 ppm NO2
Measurement Units ppb, ppm, μg/m3, mg/m3 (selectable)
Zero Noise  < 20 ppt (RMS)
Span Noise  < 0.2% 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
Rise/Fall Time  < 30 seconds to 95%
Linearity   1% of full scale
Precision   0.5% of reading above 5 ppb
Sample Flow Rate   900 cm3/min ±10%
Power Requirements   80W; 100-250VAC (50-60Hz)
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
8 x analog inputs (0-10V, 12-bit)
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)


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

US EPA: Federal Equivalent Method (EQNA-0514-212)
EU: EN14211 TÜV Rheinland​
QAL1 Certified: EN15267​
MCerts: Sira MC160304/00



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 chemiluminescense instruments. The CAPS measurement approach also reduces maintenance items, and removes the need for hazardous materials and high temperature scrubbers within the instrument. The T500U has an expected 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.