A bursting disc failure indicator.

摘要

This invention relates to profile change sensors and is especially concerned with low energy profile change sensors. In more detail the profile sensor of the invention senses a change in the shape of a relative position or both of a least one surface (5), or a part thereof, of a body and comprises a source of energy, at least one signal conveying member (1, 8, 2) for establishing a signal path from a signal emitter (9) to a signal responsive member (10) with the signal conveying member (1, 8, 2) or a further member associated therewith so disposed in relation to at least a part of a surface (5) of a body that in the event of a change, greater than a given magnitude and in a given direction of the position or the shape of the said part of the body or both, occurrence of the change results in the interruption or estabilishment of a signal.