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W-11:1:24kil <br />• VOTE M. "$I 'N.:• <br />2. Long -Term Degradation: See Figure 6 data provided. A slightly sensor <br />degradation occurs during four year period. This long sensor life expectancy <br />is due to our constant temperature control device (U.S. patent No. 4,498,330) <br />and special sensoring element employed. This result is based on current use <br />of sensor in the market place over four year period of time. <br />3. Repeatability: USI gas sensor will give a 95% accurate reading if <br />constantly exposed to hydrocarbons over a six month time. Infrequent <br />calibration is necessary only at 6 month intervals. <br />4. Effects of Temperature: USI gas sensor operates extremely well in the <br />temperature range from —10OFto +1650F(-20OCto +750C). The tempera- <br />ture effect on the sensor zero baseline (gasoline free environment), or at an <br />environment of 100 ppm gasoline is very small. Such little effect by <br />temperature change is due to the semiconductor material used, which is <br />very stable at the temperature range from 00 to + 120 OF. <br />5. Effects of Moisture: USI gas sensor will not be affected by the presence <br />of moisture. Methane, carbon monoxide, carbon dioxide, hydrogen, or no <br />oxygen environment. <br />111. VOLUME CONVERSION OF ORGANIC COMPOUNDS FROM LIQUID TOGAS <br />PHASES <br />To calculate the volume of organic compounds (normally are at liquid phase) <br />in the gas phase, we can use the ideal gas law, PV — W RT, and convert it <br />from liquid phase volume to gas phase volume. V <br />For example: 0.05 cc of Acetone (density 0.792 g/c.c., and molecular weight <br />58) will occupy 16.680 cc when it is completely vaporized at 250C room <br />temperature. If we inject 0.05 cc Acetone into a 1 liter tight chamber, we will <br />have 16,680 ppm of Acetone in the chamber. <br />0 <br />