Linear Potentiometer Crackmeter
The Linear Potentiometer Crackmeter is a robust, high resolution and accuracy instrument designed to measure displacements across cracks and joints in buildings, bridges, dams, pipelines etc. It can measure in expansion and contraction.
The Linear Potentiometer Crackmeter is a highly accurate and robust instrument used to measure displacements across cracks and joints of a structure.
The potentiometer is installed across a crack or joint of the structure to be monitored, using either groutable or expanding shell anchors.
As the crack expands or contracts, the change in the distance between the anchors causes the connecting rod within the potentiometer body to move. The movement of the potentiometer changes the output which determines the movement of the crack with high resolution and accuracy.
- High resolution and accuracy
- Robust design
- Suitable for long-term monitoring
- Suitable for manual or remote monitoring
- Two versions available; Standard (IP67) and Submersible (IP68 to 1700 kPa)
- Accurate, repeatable readings
- Long working life
- Long term stability and reliability
- Connecting cable is strong, screened and flexible
The Linear Potentiometer Crackmeter is anchored to the structure to be monitored with groutable or expansion anchors.
The change in distance between the anchors caused by the crack opening or closing, will cause a connecting rod to move within the potentiometer body, changing the resistance of the potentiometer via a voltage divider.
By reading this change in voltage, the movement of the crack can be determined.
The Linear Potentiometer Crackmeter measures displacements across cracks and joints in buildings, bridges, dams, pipelines and similar structures. It can measure both expansion and contraction of cracks or joints.
Typical monitoring applications include:
- Brick and stone buildings
- Settlement, heave or foundation clay shrinkage
- Bridges and dams
- Construction joints
- Joints and bearing/support interaction
- Tunnels and lining cracks
- Structures susceptible to earthquake and landslide areas