INDUSTRY COMPONENT

Strain Gauge

A strain gauge is a sensor that measures strain on an object by converting mechanical deformation into electrical resistance changes.

Component Specifications

Definition
A strain gauge is a precision sensor used to measure strain (deformation) on the surface of an object. It consists of a thin metallic foil pattern bonded to a flexible backing material. When the object deforms under load, the gauge experiences corresponding strain, causing its electrical resistance to change proportionally. This change is measured using a Wheatstone bridge circuit, allowing precise quantification of stress, force, pressure, or torque in industrial applications.
Working Principle
The working principle is based on the piezoresistive effect, where the electrical resistance of a conductor changes when subjected to mechanical strain. As the gauge deforms with the object, its length increases and cross-sectional area decreases, increasing resistance. This resistance change (ΔR/R) is proportional to the strain (ε) via the gauge factor (GF = ΔR/R / ε), typically around 2 for metallic gauges.
Materials
Metallic foil (constantan, nickel-chromium, or Karma alloy) bonded to polyimide or epoxy backing, with copper or silver leads. Protective coatings include silicone rubber or epoxy for environmental sealing.
Technical Parameters
ParameterTypical rangeNotes & selection driver
Accuracy±0.5%
Resistance120 Ω, 350 Ω, 1000 Ω
Gauge Factor2.0 ± 0.5
Strain Range±5000 με
Temperature Range-30°C to +80°C
Excitation Voltage5-10 V DC

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
  • Signal drift due to temperature changes
  • Creep under prolonged load
  • Moisture ingress affecting accuracy
  • Fatigue failure from cyclic loading
  • Improper bonding leading to detachment
FMEA Triads
Trigger: Temperature fluctuations
Failure: Thermal expansion causes false strain readings
Mitigation: Use temperature compensation circuits or self-temperature-compensating gauges
Trigger: Overload beyond rated capacity
Failure: Permanent deformation or rupture of gauge element
Mitigation: Implement mechanical stops or overload protection in system design
Trigger: Poor bonding or contamination
Failure: Inaccurate strain transfer or detachment
Mitigation: Follow strict surface preparation and bonding procedures per manufacturer guidelines

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance
±0.5% of full scale for standard industrial applications
Test Method
Wheatstone bridge excitation with signal conditioning, verified per ISO 376 for force measurement or ASTM E74 for calibration

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 Gauge

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 does a strain gauge work in a load cell?

In a load cell, strain gauges are bonded to a deformable element (like a beam or diaphragm). When force is applied, the element deforms, causing strain gauges to change resistance. This is measured via a Wheatstone bridge to calculate the applied force.

What are common applications of strain gauges?

Common applications include load cells for weighing systems, pressure transducers, torque sensors, structural health monitoring, and material testing in manufacturing, aerospace, and automotive industries.

How do you calibrate a strain gauge?

Calibration involves applying known forces or strains to the gauge and measuring output signals. It requires controlled environments, reference standards, and often follows ISO 376 or similar protocols for load cells.

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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