Vibrating Wire Strain Gauge SM-5
The SM-5 is a surface-mounted vibrating wire strain gauge from Roctest, composed of two end pieces joined by a tube that protects a length of steel wire, used for monitoring strain variations and evaluating stress when the material's modulus of elasticity is known.
- Range
- 3000 µε
- Model
- SM-5A, SM-5B
- Accuracy
- +/- 0.5% F.S.
Overview
In detail
How it works
Exterior forces applied on the strain gauge modify the tension in the wire and consequently its resonant frequency, which is read by an electromagnet placed in a protective housing at the centre of the tube. A built-in thermistor supplies information on the effects of temperature on the materials.
Models
The SM-5 is offered in two models differing in their mechanical supports: the SM-5A is held tight by set screws, and the SM-5B by hexagonal nuts. Both models are threaded between two anchor blocks. Gauge tension is factory-adjusted at mid-range and can later be modified by the user according to the anticipated strain direction; a built-in compressed spring compensates for the wire tension, making the SM-5 a very compliant gauge.
Installation
Anchor blocks can be welded directly to the structure, or welded to a bolt or short reinforcement bar ready to be bolted, grouted or welded to an expansion shell. A setting tool holding a dummy gauge allows both anchor blocks to be positioned accurately.
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Specifications
Technical specifications
- Model
- SM-5A, SM-5B
- Range
- 3000 µε
- Accuracy
- +/- 0.5% F.S.
- Resolution
- 1 µε (min.) with MB-3TL
- Operating temperature
- −20 to +80°C
- Active gauge length
- 149 mm (SM-5A), 129 mm (SM-5B)
- Thermistor
- 3 kΩ (see model TH-T)
- Coil resistance
- 144 Ω
- Thermal coefficient
- 11 ppm / °C
- Cable
- IRC-41A, IRC-41AP (optional)
Related
Often specified alongside
- Range
- 200 to 35,000 kPa (standard steps up to 35,000 kPa)
- Output
- Vibrating wire (also electrical, pneumatic, fibre optic)
- Accuracy
- ± 0.5% FS (vibrating wire); ± 0.25% FS (electrical/pneumatic/fibre optic)
- Accuracy
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