The Model T300 measures low ranges of carbon monoxide by comparing infrared energy absorbed by a sample to that absorbed by a reference gas according to the Beer-Lambert law.
Using a Gas Filter Correlation Wheel, a high energy IR light source is alternately passed through a CO filled chamber and a chamber with no CO present.  The light path then travels through the sample cell, which has a folded path of 14 meters.  The energy loss through the sample cell is compared with the span reference signal provided by the filter wheel to produce a signal proportional to concentration, with little effect from interfering gases within the sample.  This design produces excellent zero and span stability and high signal to noise ratio, allowing extreme sensitivity.
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 T300 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​.​

•Ranges: 0-1 ppm to 0-1000 ppm, user selectable
•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
•Comprehensive internal data logging with programmable averaging periods
•Ability to log virtually any operating parameter
•Two-year warranty
•Five-year warranty on GFC wheel

•Ranges: Min: 0 - 1 ppm full scale, Max: 0 - 1,000 ppm full scale (selectable, dual-range supported)
•Measurement Units: ppb, ppm, μg/m3, mg/m3 (selectable)
•Zero Noise: < 0.02 ppm (RMS)
•Span Noise: < 0.5% of reading (RMS) above 5 ppm
•Lower Detectable Limit: 0.04 ppm
•Zero Drift: < 0.1 ppm/24 hours
•Span Drift: < 0.5% of full scale/24 hours
•Lag Time: 10 seconds
•Rise/Fall Time: < 60 seconds to 95%
•Linearity: 1% of full scale
•Precision: 0.5% of reading above 5 ppm
•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)
•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 - 40ºC operating, 10-40ºC (US EPA Equivalency)​
•Dimensions (HxWxD): 7" x 17" x 23.5" (178 x 432 x 597 mm)
•Weight: 40 lbs​​ lbs (18 kg)