In a fluctuating or low-load situation, a dew point demand controller is recommended. By measuring the discharge dew point of the on-line desiccant bed and determining the maximum allowable drying cycle, the dew point demand controller can quickly pay for itself in energy savings. If the controller senses an adequate dew point in the on-line tower, it keeps that tower in the drying position and allows the other fully regenerated tower to stay in standby mode. In low load conditions, heated desiccant dryer systems can continue to dry your operation’s compressed air for days without utilizing purge air or any other energy.