Signal transmitter unit, in particular alarm system for detecting changes in the load on parts of land or buildings

摘要

A signal transmitter unit, in particular alarm system for detecting changes in the load on parts of land or buildings has at least one pressurised hollow body and a device for measuring and evaluating the various pressures. This system is characterised in that the measuring device (34) registers the pressure which in each case actually prevails and in that the evaluation device (36) determines the relative rise or reduction in pressure for any predeterminable time interval and compares the calculation value thus determined with a predeterminable comparison value and triggers the signal (38, 39, 40) when this comparison value has been reached or exceeded. <IMAGE>