Abstract: The invention relates to a device for detecting leaks in a flanged joint, with therebeing formed between the flanges a hollow space in which pressure changes, changes in the physical condition and/or conductivity changes are detected in the event of a leak by a corresponding sensor.

Abstract: A procedure and a device for determining corrosion of preferably insulated structural parts (2) assures in a simple way early detection of corrosion. For this purpose an electric conducting resistance wire (4) exposed to the same corrosive medium, e.g. condensation water, as the structural part (2) to be examined for corrosion is placed outside the structural part (2) and the electrical resistance of the resistance wire is measured. The effective cross-section of the resistance wire (4) and its electrical resistance change with the corrosion of the resistance wire (4) so that the resistance change of the resistance wire (4) registers the effect of the corrosive medium.

Abstract: A leakage control mechanism for aggregate (10) containing liquid and/or with liquid running through them has a receptacle (28) for liquid escaping from the aggregate (10), mounted elastically in vertical direction and equipped with a device (46, 66) for detecting the vertical position of the receptacle (28) and triggering a signal when a pre-set position of lowering is reached by the receptacle (28).