Internal UV Ozone Photometer Page 9-10The "Detailed" Photometer diagnostics presents more detailedinformation about the photometer. Rather than updating eachphotometer cycle, it presents new information each half-cycle,allowing the reference and sample data to be observed. Figure 9-shows an example of the Detailed Photometer Diagnostics screen.Figure 9-5 The Photometer Diagnostics Screen, DetailedMany items found in the detailed screen are the same as thegeneral screen, however there are a few additional items. Theyare:Ref. This is the detector reading during thereference half of the Photometer cycle,after being converted to a unit-lessnumber or "count".Sample This is the detector count during thesample half of the Photometer cycle.The ratio of the reference count to thesample count is used to calculate theozone concentration as described on Page2.Sample Pressure (mmHg) This is the pressure in the measurementtube as measured by the Photometer'spressure sensor.
