Model 211 Scrubberless Ozone Monitor™
The new Model 211 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.
Our patented (US Patent No. 8,395,776) 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
To download a brochure describing the Model 211 Ozone Monitor™ (PDF format), click on the download button below.
Confused about which ozone monitor best suits your application? Click here for a comparison of all of our ozone monitors and a discussion of their suitability to various applications.
Our Tech Note #001 compares the specifications of our Models 106-L, 202, 205, 211 and POM with other high precision ozone monitors (Thermo, Teledyne-API and Ecotech).