INDUSTRY COMPONENT

Strain Gauges

Precision sensor converting mechanical strain into electrical resistance changes for torque measurement

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Component Specifications

Definition
Strain gauges are precision sensing devices that measure mechanical deformation (strain) by detecting changes in electrical resistance. When bonded to a torque sensor's structural element, they convert torsional strain into proportional electrical signals through the piezoresistive effect, enabling accurate torque measurement in rotating machinery and systems.
Working Principle
Operates on the piezoresistive principle where mechanical strain causes dimensional changes in the gauge's conductive grid, altering its electrical resistance proportionally to the applied torque. This resistance change is measured using Wheatstone bridge circuits to produce precise voltage outputs corresponding to torque values.
Materials
Constantan or Karma alloy foil (typically 3-6 μm thick) on polyimide backing (25-50 μm), with copper-nickel solder tabs and protective epoxy coating. Grid patterns optimized for torsional strain measurement.
Technical Parameters
  • Creep <0.1% FS/30min
  • Linearity <0.1% FS
  • Resistance 120Ω, 350Ω, 1000Ω
  • Fatigue Life >10^7 cycles
  • Gauge Factor 2.0-2.1
  • Strain Limit ±2%
  • Temperature Range -50°C to +200°C
Standards
ISO 4965, DIN 50100, ASTM E251

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Strain Gauges.

strain gauge torque sensor piezoresistive sensor strain measurement torque measurement Wheatstone bridge industrial sensors mechanical testing Strain Gauges Strain Gauges in Machinery and Equipment Manufacturing

Parent Products

This component is used in the following industrial products

Torque Sensor

A device that measures and converts torque (rotational force) into an electrical signal for monitoring and control purposes.

View Product Details

Force Sensor

A device that measures and converts mechanical force into an electrical signal.

View Product Details

Force/Torque Sensor

A transducer that converts mechanical force and torque into measurable electrical signals.

View Product Details

Engineering Analysis

Risks & Mitigation
  • Bonding failure due to improper surface preparation
  • Moisture ingress causing signal drift
  • Temperature sensitivity affecting accuracy
  • Fatigue failure from cyclic loading
  • Electromagnetic interference in signal transmission
FMEA Triads
Trigger: Improper surface preparation before bonding
Failure: Gauge detachment or poor strain transfer
Mitigation: Follow strict surface cleaning, degreasing, and abrasion protocols; use recommended adhesives and curing procedures
Trigger: Exposure to corrosive environments
Failure: Grid corrosion and signal degradation
Mitigation: Apply protective coatings; use environmentally sealed sensors; select corrosion-resistant materials
Trigger: Thermal expansion mismatch
Failure: Temperature-induced measurement errors
Mitigation: Use temperature-compensated gauges; implement temperature correction algorithms; maintain stable operating temperatures

Industrial Ecosystem

Compatible With

Interchangeable Parts

Compliance & Inspection

Tolerance
±0.1% to ±0.5% of full scale depending on grade and application
Test Method
Calibration against certified reference torque standards using deadweight machines or transfer standards; verification per ISO 376 or similar standards

Buyer Feedback

★★★★☆ 4.8 / 5.0 (11 reviews)

"Impressive build quality. Especially the technical reliability is very stable during long-term operation."

"As a professional in the Machinery and Equipment Manufacturing sector, I confirm this Strain Gauges meets all ISO standards."

"Standard OEM quality for Machinery and Equipment Manufacturing applications. The Strain Gauges arrived with full certification."

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Frequently Asked Questions

How do strain gauges measure torque in sensors?

Strain gauges are bonded to the torque sensor's shaft or structural element. When torque is applied, it creates torsional strain that deforms the gauge, changing its electrical resistance proportionally to the torque value, which is then converted to an electrical signal.

What maintenance do strain gauges require?

Strain gauges require minimal maintenance but need protection from moisture, chemicals, and mechanical damage. Regular calibration checks and inspection of bonding integrity are recommended to ensure measurement accuracy.

Can strain gauges be replaced individually?

Yes, individual strain gauges can be replaced, but this requires careful surface preparation, precise bonding, and recalibration. Complete torque sensor replacement is often more cost-effective for damaged gauges.

Can I contact factories directly?

Yes, each factory profile provides direct contact information.

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Strain Gauge Assembly Strain Relief