Fissurometers and crack monitors - important instruments for safety assessment

Principle of operation

A measuring head is attached to one side of the joint or crack to be monitored and a measuring stop or anchor point is attached to the other side. The distance between these two points is measured. The temporal development of the displacements in relation to a zero measurement allows an assessment of the crack movement. To bridge larger distances, the two parts can be connected to each other via a measuring rod located in a guide tube or read off directly with a dial gauge or the tactile of an electrical displacement sensor. The cladding tube can be telescopic, with the longer part sliding over the shorter one. This design and the use of rod ends in our HD Fissurometers guarantee error-free measurement, since any torsional forces and buckling stresses that may occur do not lead to any falsification of the measured values. Two different types are available: Parallel fissurometers measure the joint width between two parallel surfaces, normal fissurometers measure the joint between two perpendicular surfaces. This type is mainly used for installations in the field.

For buildings, compact instruments with mounting plates made of stainless material with angles are available. They are arranged so that the measurement can take place in all three spatial directions. A measuring range of +/- 15 mm is achieved in each case. This type is designed for manual readings with a dial gauge.

Special designs can also be supplied for special areas of application.

Our service

In addition to supplying the instruments manufactured in-house, we can also assemble and commission them in difficult terrain. Moreover, we supply data acquisition and possible alarm functions according to the wishes of our customers and the local conditions (for example with solar power supply in nature).