| 摘要 |
The device is portable and transmits an alarm triggering code and an identifying code limiting the risk of abuse. The device according to the invention is powered by a cell or battery 1 and comprises a circuit breaker 11, an integrated or hybrid circuit particularly incorporating a code generator 3, a transmitter 4, a clock-controlled counter 5 and irreversible disabling circuits, here with fuses F1, F2 and controlled circuit breakers 6, 7. On an order from the counter, after a time t1 of reversible operation allowing a test to be carried out, the alarm is triggered until the time t2. The device can no longer be reused from the time t1. The device according to the invention is particularly intended for the protection of people in confined spaces and in walkways. <IMAGE>
|
