Emerson Electric Co.
SYSTEM AND METHOD FOR DUAL OCCUPANCY DETECTION

Abstract:

A system and method of detecting occupancy of a conditioned space are provided. The method includes controlling an environmental parameter of the conditioned space to a first selectable value using a first output signal of a process controller. The process controller configured to receive an indication of the environmental parameter of the conditioned space. The method also includes receiving a first indication of occupancy of the conditioned space using a passive occupancy sensor, receiving a second indication of occupancy of the conditioned space using an active occupancy sensor, and determining an occupancy state of the conditioned space based on a correlation between the first indication of occupancy and the second indication of occupancy. The method further includes controlling the environmental parameter of the conditioned space to a second selectable value based on the determined occupancy state.