The Model T400 UV Absorption analyzer uses a system based on the Beer-Lambert law for measuring low ranges of ozone in ambient air.

A 254 nm UV light signal is passed through the sample cell where it is absorbed in proportion to the amount of ozone present. Periodically, a switching valve alternates measurement between the sample stream and a sample that has been scrubbed of ozone. The result is a true, stable ozone measurement.

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 using the included APIcom™ software.

Ranges: Min: 0-100 ppb Full scale
Max: 0-10 ppm Full scale (selectable,
dual ranges and auto ranging supported)

Measurement Units: ppb, ppm, μg/m3, mg/m3 (selectable)
Zero Noise: < 0.3 ppb (RMS)
Span Noise: < 0.5% of reading (RMS) above 100 ppb
Lower Detectable Limit: < 0.6 ppb
Zero Drift: < 1.0 ppb/24 hours
Span Drift: < 1% of reading/24 hours
Lag Time: < 10 seconds
Rise and Fall Time: < 20 seconds to 95%
Linearity: 1% of full scale
Precision: <0.5% of reading above 100 ppb
Sample Flow Rate: 800 cm3/min ±10%

Maximum Concentration: 1.0 ppm
Minimum Concentration: 0.050 ppm
Resolution: 0.5 ppb
Repeatability (7 days): 1% of reading
Initial accuracy: ± 5% of target

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 (with EPA Equivalency)
Dimensions (HxWxD): 7” x 17” x 23.5” (178 x 432 x 597 mm)
Weight: 28 lbs (12.7 kg) 30.6 lbs (13.8 kg) with IZS

US EPA: EQOA-0992-087
MCERTS: Sira MC 050070/04