Patent ID: 9644893
Date: 2017-05-09
CPC Classifications: F26B

Claim:
1. A control system for an air dryer that switches a flow and counter flow of air through each of two desiccant towers in response to a regeneration cycle signal, comprising: a sensor positioned in an inlet to an air dryer to output a signal corresponding to the temperature of an air stream in the inlet; a proximity sensor positioned in a back flow check valve positioned in fluid communication between a first main reservoir and a second main reservoir that are connected in series; and a controller interconnected to the temperature sensor that is programmed to calculate a drying cycle time that is proportional to the saturation partial pressure of water vapor in the inlet air stream based on the signal corresponding to the temperature of the stream of air in the inlet of the air dryer and to output a regeneration cycle signal according to the drying cycle time that causes the flow and counter flow of air through each of the two desiccant towers to switch.