A SENSOR APPARATUS

摘要

A sensor arrangement for detecting a crash in a motor vehicle comprises a substantially sealed chamber (1) and a pressure sensor (2) to monitor the pressure within the chamber and to activate an alarm (3) if there is an unacceptably large leak in the chamber. The sensor measures the pressure within the chamber and activates the alarm if the pressure within the chamber does not fulfil predetermined criteria. Means such as a heater coil (4) may be provided to artificially increase the pressure within the chamber.