| 摘要 |
An intruder alarm system for use in an articulated trailer comprises two or more battery-powered passive infra-red (PIR) sensors with 180{ or 360{ fields of view. The sensors may be fitted with anti-tamper devices and disguised to resemble trailer lights. A driver may be notified of the presence of an intruder by a light and buzzer in the cab, so that the intruders are unaware of the alarm. The batteries may be charged by a solar energy panel. The system may be armed by a device with anti-scrambling capability mounted on a key fob. |
