Model T500U with NumaView™ Software

CAPS Trace-level NO2 Analyzer

General Details

CAPS Trace-level NO2 Analyzer​​​

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.

  • 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
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% Linearity
1% of full scale Precision0.5% of reading above 5 ppb Sample Flow Rate
900 cc​/min ±10% Power Requirements100-250VAC (50-60Hz); Typical power 80W​
Analog Output Ranges10V, 5V, 1V, 0.1V (selectable) Recorder Offset
±10% Included I/O1 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/O1 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) Weight
33 lbs (15kg)
​ Certifications
​US EPA: Federal Equivalent Method (EQNA-0514-212)
EU: EN14211 TÜV Rheinland​
QAL1 Certified: EN15267​​
MCerts: Sira MC160304/00

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.

Item Action Frequency Cal Check Required
Test Functions Review and evaluate Weekly No
Zero/Span Check Evaluate offset and slope Weekly No
Zero/Span Calibration Zero and span calibration Every 3 months Yes
Sample Filter Change sample filter Annually (may need more frequently in a high dust load environment) No
AREF Filter and Charcoal Filter Change both Annually Yes
Spectrometer Mirrors Contact Technical Support As necessary due to excessive Measured Loss Yes
Pneumatic sub-system Check for leaks in gas flow paths Annually or after repairs involving pneumatics Yes if a leak is repaired
Internal Pump Replace Measured Flow less than 800 cm3/min Yes​