Grain System Specialists Improving Grain System Efficiency		SENTINEL II The SENTINEL II is simple to understand and easy to operate. A resettable elapsed time meter, designed to eliminate unnecessary fan operation, keeps track of cooling or warming fronts by monitoring hours of fan operation and indicates when either front moves completely through the grain. By using Automatic Dual (Hi-Lo) Temperature and Humidity Controls, SENTINEL II is adaptable to all geographical variations of temperature and humidity conditions. The automatic dual temperature controls regulate the temperature range for fan operation. The operator can set the high temperature range to prevent a warming front from occurring and can set the low temperature range to prevent over cooling. The automatic dual humidity controls set the limits on the type of air entering the grain. This allows the operator to prevent operation of aeration fans when the outside relative humidity is high, avoiding potential moisture increase in grain. It also prevents operation of aeration fans when humidity is low, avoiding over drying. SENTINEL II features a heavy duty, weather tight steel cabinet ventilated and screened to prevent rodent damage. For additional cleanliness and safety, components are simple to remove and store during non-use.