The Model T204 combines the proven chemiluminescence NO/NO2/NOx measurement technology with an ozone bench, using UV absorption, to create the world's first US EPA-approved method NO2/O3 analyzer. The Model T204 is ideal for urban airshed monitoring, traffic studies, or stand alone NOx/O3 monitoring.  ​The economical T204 allows reduced integration and procurement costs while providing a simple, stable, and reliable monitoring solution.
The chemiluminescence NO/NO2/NOx channel uses the proven TAPI optical bench and pneumatics of the T200, while the compact UV absorption ozone sensor is adapted from the TAPI 465L ambient ozone monitor. In combination, these two technologies solve many of the problems of users that require a high performance analyzer in a smaller, more cost-effective package.
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 T204 comes with the Numaview™ Software. NumaView™ Remote PC Software allows for a remote connection with virtual interface and data downloading capability to analyzers operating NumaView™ Software.​

•Simultaneous NO, NOx, NO2 and Ozone readings
•Compact, cost-effective analyzer
•Independent Ranges and Auto-Range
•Large, vivid color display with touch screen interface
•Ethernet, RS232 and (optional) USB com ports
•Adaptive signal filtering optimizes response time
•Ability to log virtually any combination of operating parameters
•Optional analog inputs
•Optional Zero/Span Valves
•US EPA Federal Equivalent Method EQOA-0514-214 for Ozone
•US EPA Federal Reference Method FNA-1194-099 for NO2
•Two-year warranty
•Technical support for the life of the instrument

•Ranges:
-Nitrogen Oxides (NOx) Sensor: Min: 0-50 ppb Full scale, Max: 0-20,000 ppb Full scale (selectable,independent NO, NO2, NOx ranges and auto ranging supported)
-Ozone (O3) Sensor: Min: 0-50 ppb Full scale, Max: 0-1,000 ppb Full scale
•Zero Noise:
-Nitrogen Oxides (NOx) Sensor: < 0.2 ppb (RMS)
-Ozone (O3) Sensor: < 1 ppb (RMS)
•Span Noise:
-Nitrogen Oxides (NOx) Sensor: < 0.5% of reading (RMS) above 50 ppb or 0.2 ppb, whichever is greater
-Ozone (O3) Sensor: < 0.5% of reading (RMS) above 0.1 ppm
•Lower Detectable Limit:
-Nitrogen Oxides (NOx) Sensor: 0.4 ppb
-Ozone (O3) Sensor: <2 ppb
•Zero Drift:
-Nitrogen Oxides (NOx) Sensor: < 0.5 ppb/24 hours
-Ozone (O3) Sensor: <1% full scale/24 hours
•Span Drift:
-Nitrogen Oxides (NOx) Sensor: < 0.5% of full scale/24 hours
-Ozone (O3) Sensor: <1% full scale/24 hours
•Lag Time:
-Nitrogen Oxides (NOx) Sensor: < 20 seconds  
-Ozone (O3) Sensor: < 10 seconds
•Precision:
-Nitrogen Oxides (NOx) Sensor: 0.5% of reading above 50 ppb  
-Ozone (O3) Sensor: 0.5% of reading above 100 ppb
•Measurement Units: ppb, ppm, μg/m3, mg/m3 (selectable)
•Rise/Fall Time: < 60 seconds to 95%     
•Linearity: 1% of full scale
•Sample Flow Rate: 500 cm3/min ±10%
•AC Power Requirements: 100-120V, 60 Hz (3.0 A); 220-240V, 50 Hz (2.5 A); 220-240V, 50/60 Hz (2.5 A)
•Analog Output Ranges: 10V, 5V, 1V, 0.1V (selectable) All Ranges with 5% under/over range
•Analog Output Resolution: 1 part in 4096 of selected full-scale voltage
•Recorder Offset: ±10%
•Standard 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 - 40ºC (with US EPA Approval)
•Dimensions (HxWxD): 7" x 17" x 23.5" (178 x 432 x 597 mm)
•Weight: Analyzer: 40 lbs (18 kg), External pump: 15 lbs (7 kg)
•Humidity Range: 0-95% RH non-condensing