Thermo Fisher Scientific - Model 43i TLE -Enhanced Trace Level SO2 Analyzer

Using pulsed fluorescence technology, the Model 43i -TLE measures the amount of sulfur dioxide in the air down to 50 ppt. The pulsing of the U.V. source lamp serves to increase the optical intensity whereby a greater U.V. energy throughput and lower detectable SO2 concentration are realized.  Reflective bandpass filters, as compared to commonly used transmission filters, are less subject to photochemical degradation  and more selective in wavelength isolation.  This results in both increased detection specificity and long term stability.