optimize the trapping efficiency of the loop trap system temperatures are necessarily low. Maximum SAW sensitivity is achieved by using a crystal temperature of 10oC or 0oC. A valve temperature of 70oC and an inlet temperature of 50oC are recommended. Because the loop trap contains only 1

some time, yet physical sensors have limited performance because of overlapping responses and physical instability. ENoses cannot separate or quantify the chemistry of aromas. A new type of electronic nose, called the zNose?, is based upon ultra-fast gas chromatography, simulates an almost unlimited number of specific virtual chemical sensors, and

optimize the trapping efficiency of the loop trap system temperatures are necessarily low. Maximum SAW sensitivity is achieved by using a crystal temperature of 10oC or 0oC. A valve temperature of 70oC and an inlet temperature of 50oC are recommended. Because the loop trap contains only 1

using a side-ported sample needle and PTFE filter attached to the inlet of the zNose? as shown in Figure 14. The concentration of ethanol in headspace vapors from water at room temperature is very low because ethanol is very soluble in water. Heating the water sample using a

injector when placed in the helium section (inject position). Operation is a two step process. Ambient air (aroma) is first sam¬pled and organic vapors collected (precon¬centrated) on the trap. After sampling the trap is switched into the helium section where the collected organic

optimize the trapping efficiency of the loop trap system temperatures are necessarily low. Maximum SAW sensitivity is achieved by using a crystal temperature of 10oC or 0oC. A valve temperature of 70oC and an inlet temperature of 50oC are recommended. Because the loop trap contains only 1

552 and concentration as 415 ppm The zNose® system response is linear over a wide range of vapor concentrations. This is clearly shown by the N-point responses obtained from a series of 1-liter tedlar bags injected with increasing amounts of ethanol as shown in Figure 11. Detector Sensitivity vs

and 10oC detector temperatures, 7-replicate measurements at 100 and 13-ppm ethanol concentrations yield MDLs of 14.1 and 5.2 ppm respectively as shown in Figure 13. . Detection of Ethanol in Water Headspace vapors from water standards (20 mL water in a 40 mL vial) were sampled directly