A control arrangement (20) for an entrance system (10) has one or more movable door members (D1 . . . Dm) and an automatic door operator (30) for causing movements of the one or more movable door members (D1 . . . Dm) between closed and open positions. The control arrangement (20) comprises a controller (32) and a plurality of sensors (S1 . . . Sn). Each sensor is connected to the controller (32) and is configured to monitor a respective zone (Z1 . . . Zn) at the entrance system (10) for presence or activity of a person or object. Each sensor (S1 . . . Sn) has an active mode and an inactive mode, wherein the sensor consumes no electric power in the inactive mode or substantially less electric power in the inactive mode than in the active mode. The controller (32) is configured to determine a current operational state of the entrance system (10) among a plurality of possible operational states, and selectively cause at least one of the sensors (S1 . . . Sn) to be in its active mode or in its inactive mode depending on the determined current operational state of the entrance system (10).