The new Model 212 Scrubberless Ozone Monitor uses the proven ultraviolet （UV） absorption method with an innovative gas-phase scrubber technology to measure ozone virtually free from interferences. In the reference mode, the instrument uses the reaction between ozone and nitric oxide （NO） to selectively remove ozone from the sample. This reaction is orders of magnitude faster than with any other ambient gas, resulting in the removal of only ozone and not potentially interfering compounds that absorb UV light. The instrument is ideally suited for measurements of ozone in heavily polluted air where interference is likely from particulates, mercury, or VOCs. The ozone monitor combines the stability of our proven dual beam ozone monitors with our selective scrubber technology to provide accurate ozone measurements in the most polluted air.
The gas-phase scrubber technology uses NO to quantitatively react with ozone and remove it from the sample. This reaction has long been used as a gas phase titration for the measurement of either NO or O3. In the Scrubberless Ozone Monitor, a low concentration of NO is added to the sample to generate ozone-free, reference air. The light intensity is measured in the reference and sample modes, and the concentration of ozone is calculated directly from Beer's Law. Nitric oxide can be supplied from an external NO cylinder and will provide over a year of gas supply. Alternatively, nitric oxide can be generated inside the instrument using an optional photolytic NO generator and an external cylinder of nitrous oxide （N2O）, which is non-toxic, non-corrosive and relatively inexpensive.
All 2B Tech ambient air monitors offer remote instrument operation via RS-232, choice of averaging time （2 s to 1 hr）, analog output （0-2.5 V）, current output （4-20 mA）, internal data logger, and optional flash memory. Our data display and graphing software allows continuous display of data which can be saved for offline analysis
Features
Options
Specifications
| Measurement Principle | UV Absorption at 254 nm; Dual Beam |
| Linear Dynamic Range | 0.5 ppb to 2.0 ppm |
| Resolution | 0.1 ppb |
| Precision （1σ; rms noise） | Greater of 0.5 ppb or 1% of reading for 10-s average |
| Accuracy | Greater of 1.0 ppb or 2% of reading |
| Limit of Detection （2σ） | 1.0 ppb |
| NIST-Traceable Calibration | Yes |
| Flow Rate （nominal） | ~2 Liter/min |
| Flow Rate Requirement | >1.2 L/min |
| Baseline Drift | <1 ppb/day |
| Sensitivity Drift | <0.5%/day |
| Measurement Time, Frequency | 2 s, 0.5 Hz |
| Response Time, 100% of Step Change | 4 s for 2-s averaging; 20 s for 10-s averaging |
| Averaging Times | 2 s, 10 s, 1 min, 5 min, 1 hr |
| Internal Data Logger Capacity | 14,336 lines （10 s avg. = 1.4 days; 1 min avg = 10 days; 5 min avg = 1.4 mo; 1 hr avg = 1.6 yr）; Virtually unlimited capacity with USB Flash Drive |
| Ozone Units | ppb, ppm, pphm, µg m-3, mg m-3 |
| Pressure Units | mbar, torr |
| Temperature Units | °C, K |
| T and P Corrected | Yes |
| Operating Temperature Range | 10 to 50 °C |
| Operating Altitude Range | ~0-30 km （~30-1000 mbar） |
| Power Requirement; Supplied by Battery or 110/220 VAC Power Pack | 12 V dc or 120/240 V ac, 1.1 A at 12 V, 13 watt; 8 watt with Touch Screen off |
| Size | Rackmount: 17" w x 14.5" d x 5.5" h （43 x 37 x 14 cm） |
| Weight | 14.3 lb （6.5 kg） |
| Analog Inputs for Internal Logging of Other Instruments | 3 Analog Inputs, 0-2.5 V; For example could log external T, P and RH |
| Data Outputs | Touch Screen Display, USB, RS232, 0-2.5 V Analog, Optional 4-20 mA Analog |
| Data Transfer Baud Rates | 1200, 2400, 4800, 19200 |
| Output Ranges | User Defined Scaling Factor in Menu |
| DewLine™ | Yes |
| Long Life Pump | Yes, 20,000 hr |
| Flow Meter | Yes |
| Options | GPS, Lamp Heater; Bluetooth for wireless data transmission |
System Includes
86-21-67159386
