Spot weldable Strain Gauges

Description

Applications:

Designed to steel structures in:

• Tunnels
• Excavation bracing
• Piles

Bridges Standard unit has a 150mm gauge length, a 3000µε range 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: 3000ε
• Resolution: 0.4ε
• Accuracy: ±0.5% F.S.
• Nonlinearity: <0.5% F.S.
• Temperature Range: -20 to +80
• Active Length: 51mm