INDUSTRY COMPONENT

Strain Gauges

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

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
ParameterTypical rangeNotes & selection driver
Creep<0.1% FS/30min
Linearity<0.1% FS
Resistance120Ω, 350Ω, 1000Ω
Fatigue Life>10^7 cycles
Gauge Factor2.0-2.1
Strain Limit±2%
Temperature Range-50°C to +200°C

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Standards
ISO 4965, DIN 50100, ASTM E251

Parent Products

This component is used in the following industrial products

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

Typical Suppliers & Equivalents

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

Procurement Evaluation Criteria

A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation
Request current drawings, revision history, and a signed specification sheet.
Manufacturing capability
Verify equipment lists, process limits, capacity, and representative production evidence.
Inspection readiness
Confirm test methods, calibrated equipment, sampling plans, and traceable reports.
Supplier transparency
Check the legal entity, factory address, ownership, certifications, and direct contacts.

CNFX does not score or rank suppliers. Buyers must verify all claims and documents with the legal manufacturer before ordering.

Manufacturers of Strain Gauges

4 companies list this product among what they make. Company figures are quoted from each company's own website; every card states where the relationship came from.

HaiboSensor
Guangdong, CN
Listed on the company's own website · profile compiled by CNFX from public sources
Hefei Brans Measuring And Controlling Technology Co., Ltd.
Shanghai, CN
Listed on the company's own website · profile compiled by CNFX from public sources
Shanghai Automation Instrumentation Co., Ltd
Shanghai, CN
Listed on the company's own website · profile compiled by CNFX from public sources
Xiaogan Yueneng Electronic Technology Co., Ltd.
Fujian, CN
Listed on the company's own website · profile compiled by CNFX from public sources

Manufacturer listings support early research and capability understanding. They are not certification, ranking, or transaction guarantees.

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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.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records. See the editorial policy.

Preliminary Technical Classification
This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

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