B2CH-18-C ifications continued Nominal output torque of lo Bevel-helical speed reducer B2

Flender/Flender Gear Units/Bevel-helical speed reducer B2

ment deci- sions such as fumigation, aeration, or top-dressing with protectants. The grain is likelyto develop hot spots owing to increase in insect population and mold growth. It is also likely that moisture condensation takes place owing to moisture and temperature gradients and consequent air movements in the bulk storage. Grain temperatures inside bins in vari-ous depths are to be recorded regularly and the data checked for any changes. In bulkstorage, physical traps, such as probe traps and cone traps, are useful in trapping activeand mobile adult beetles. Bait bags containing mixture of broken wheat, peanut, andkibbled carobs or brown rice are useful for detecting infestation in godowns (4,. Pher- omone traps are used for the detection of moth pests and grain borers. Acoustic monitoring of pests, mentioned in Sec. 3.1., can be done by keeping sensors parallel to the temperaturesensors in silos and bins. There has been intensive research on the automation of pestmonitoring in bulk storage in industrialized countries such as France and United States(5,. 4.1.5 Inert Dusts Inert dusts, such as wood ash, paddy husk ash, koalins, lime, and clay materials; have been traditionally used in the developing countries for grain preservation (. They actas desiccant, absorbing water from the insect body and may also have an abrasive action.Some of the dusts such as silica aerogels absorb the waxy layer of the exoskeleton of theinsects. They act slowly and take 2 or more days to cause insect mortality. They arerelatively safer than conventional insecticides. The disadvantages are that they affect grain bulk density, owability, and grain-handling properties, and the dusts containing crystal- line silica may cause silicosis and other respiratory diseases. Inert dusts are generally lesseffective at higher relative humidity. The particle size also matters in its effectiveness.There are ve types of inert dusts (: () nonsilica dusts (.., limestone, lime, katelsons);() ash