| 摘要 |
A detector 100, suitable for attaching to a light fitting, comprises a passive infra-red sensor 102 for detecting the presence of a person and a clip 136 suitable for suspending the detector from an existing light fitting with the sensor arranged such that its detection field covers, at least partially, the area illuminated by the light fitting. The clip may comprise first and second hooks 128 by which the detector may be arranged to hang from the light fitting. Means such as bracket 118 and rack and pawl arrangement 124, 126 may be provided, by which the position of the detector with respect to the light fitting may be adjusted. |
