| 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. |
