Description
Displacement Tell-Tale
The Avongard Displacement Tell-Tale monitors horizontal and displacement movement where there is a “step” across a crack due to displacement or out of plane movement.
The Displacement Tell-Tale consists of three components:
- A base plate (not calibrated)
- A top plate (calibrated in mm)
- A graduated ruler (calibrated in mm)
Note that the ruler is not left on the gauge but is used to measure the relative movement in the two plates.
Features:
- Calibrated in millimetres
- Displacement monitoring range of 0-110mm
- Horizontal monitoring range of -10mm to +50mm
- Fix using Screws (included) and/or AE14 Araldite Adhesive (not included but available as accessory)
- Supplied with full instructions and Crack Record Sheet
Fixing the Tell-Tale
The base plate and horizontal scale are fixed using screws and adhesive each side of the crack to be monitored.
Monitoring Crack Movement
By inserting the graduated ruler, the horizontal and displacement positions can be read and marked on the crack record sheet supplied. The movement of the crack can then be monitored over time.
It is also recommended to record the ambient temperature as seasonal changes may affect the evaluated structure.
Visit the SUPPORT page for related documents.
For a better understanding on cracking causes and structural behaviour, we recommend the book “Guide to subsidence”, also available in our store.
