Bevel-helical gearbox B4 uest Extremely dusty installation locations or t B4-HV20-B

Flender/Flender Gear Units/Bevel-helical gearbox B4

trapping ratio of the adsorbent is 1 for one or morevolatile species (.., 1% of the volatile molecules entering the trap are adsorbed). In other words, the adsorbent is not saturated during the collection period. On the basis of discussions with industry specialists, reasonable assumption for the minimal detectablequantity of low-molecular-weight volatile trapped in suitable adsorbent is of the orderof 1 ng (1 /H1kg). reasonably distinguishable chromatographic peak should be obtained if 1 ng (1/H1kg) is trapped, thermally desorbed, and identied with ame ion detector (FID). Several questions regarding concentrations of volatiles now arise. First, if there is pathogen-specic compound emanated, what percentage of the total volatile spectrumwould it account for? It is assumed that the compound to be detected accounts for 1%, bymass, of the volatile emanations from diseased individuals, and that its molecular weight isclose to the average of all the molecular species emanated, not including CO 2. Second, the question arises as to whether the rate of emanation (in kilograms per kilogram perday [kg kg /H1day/H1]) changes as the infection progresses. Since the number of infected individuals should increase in time, it is assumed that at some time after initial infection, there are sufcient number infected that various stages of infection are represented anda constant emission rate may be assumed. Suction rate through traps can be assumed to be about 5 /H1, per trap, on the basis of equipment tested in commercial potato storage (. This is roughly equivalentto 1 kg day /H1airow, per trap. For compound of molecular weight roughly 1 to be collected in sufcient amounts to be clearly detected (1 ng) in one trap, it would have to be present in air in concentration of roughly 5 /H1/H1ppm, if collection were done over full day in sealed room. In ventilated storage, the detectable concentrationwould have to be several times higher, depending on the number of air chan