| 摘要 |
Apparatus for controlling an electrical load, in particular for the environmental control of a room, comprises an occupancy sensor (5) comprising a thermopile array. The occupancy sensor is responsive to the presence of a person within a detection field (13) of the occupancy sensor (5). The apparatus further comprises a movement sensor (6) responsive to the movement of a person within a detection field of the movement sensor and a controller arranged to receive detection signals from the occupancy sensor (5) and the movement sensor (6) and to generate a control signal for the electrical load in response to the received detection signals. The controller is configured to generate a first control signal in response to detection of a person by the movement sensor (6) and to modify the first control signal to a second control signal in response to detection of a person by the occupancy sensor (5). The controller may be user-programmable and be configured to store data indicative of at least one priority location within the detection field of the occupancy sensor (5) by receiving from an input device an input signal while receiving from the occupancy sensor (5) a detection signal indicative of the presence of a person at the priority location. The controller configured subsequently to generate the second control signal in response to a detection signal from the occupancy sensor (5) indicative of the detection of a person at the priority location. |
