Arc Weldable Strain Gauges

Description

Applications:

Designed to be arc welded to steel structures in:

• Tunnels
• Excavation bracing
• Piles
• BridgesStandard unit has a 150mm gauge length, a 3000µε range and a 1µε sensitivity.

The gauge is adaptable for bonding to concrete or bolting to steel surfaces via the end mounting blocks.
Operating Principle:

Steel wire length is tensioned between two mounting blocks that are arc welded to the surface of a structural steel member. Deformation of the structure under load produces relative movement between the two mounting blocks causing a change in wire tension and a corresponding change in its frequency of vibration.
Using standard vibrating wire principles easily read by loggers or readout.

Advantages:

• • Robust user-friendly design
  • Long term stability
  • High water resistance
  • Read over long cable lengths
  • Read with standard vibrating wire loggers and readouts.

• Removable coil so easy replacement if cable is damaged
• Automatic temperature compensation via hermetically sealed thermistor.Specifications:

Standard Range: 3000µε
Resolution: 1µε
Accuracy: ±0.5% F.S.
Nonlinearity: <0.5% F.S.
Temperature Range: -20µε to +80°C
Active Length: 150mm