| 摘要 |
<p>A security system sensor unit incorporates a plastics moulding with a main body (11) incorporating a recess for a magnetic reed contact set (18) and a depression in one surface for a series of electrical connector screws such as (25), of which only two (27, 28) are connected to the contact set (18). The plastics moulding incorporates a two part integral flanged cover (12) one part (13) which can be pivotted away from the recess to provide good access thereto.</p> |
