Device for testing internal pressure of a gas reservoir of an airbag inflator

A device for testing the internal pressure of a gas reservoir comprising:

• an oscillation transmitter placed on an exterior surface of the gas reservoir;
• an oscillation sensor placed on the exterior surface of the gas reservoir;
• a temperature-measuring device placed on the exterior surface of the gas reservoir;
• and
• evaluation electronics comprising a comparator connected to the oscillation sensor and a set value transmitter that indicates the resonance frequency measured under a set internal pressure, whereby the comparator compares the resonance frequency measured by the oscillation sensor with the resonance frequency indicated by the set value transmitter, the oscillation transmitter, the oscillation sensor, and the temperature-measuring device are integrated in one unit such that the generation and frequency measuring of the oscillations are carried out at locations on the exterior surface of the gas reservoir that are distanced from one another with respect to a longitudinal axis of the gas reservoir, wherein the unit is oscillation-decoupled by the oscillation transmitter and the oscillation sensor.