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Strain Gauge / Piezoresistor Component – Machinery and Equipment Manufacturing

Component Specifications

Definition

A strain gauge or piezoresistor is a precision sensing element that measures mechanical strain by detecting changes in electrical resistance when subjected to deformation. In pressure sensors/transducers, it converts applied pressure into measurable electrical signals through the piezoresistive effect, where material resistance changes proportionally to mechanical stress. These components are typically bonded to a diaphragm or beam that flexes under pressure, with the resulting strain altering the gauge's resistance in a Wheatstone bridge configuration for accurate pressure measurement.

Working Principle

Operates on the piezoresistive effect where mechanical strain causes changes in electrical resistance. When pressure deforms the sensing element, its conductive path length and cross-sectional area change, altering resistance proportionally to the applied strain. This resistance change is measured using a Wheatstone bridge circuit that converts it into a voltage output corresponding to the pressure input.

Materials

Constantan or Karma alloy foil (for metallic strain gauges), silicon with doped semiconductor regions (for piezoresistors), polyimide or epoxy backing, copper or gold lead wires, protective coatings of silicone gel or epoxy.

Technical Parameters

Accuracy ±0.1% to ±0.5% FS
Resistance 120Ω, 350Ω, 1000Ω
Gauge Factor 2.0-4.0
Strain Range ±5000 με
Temperature Range -40°C to +150°C
Excitation Voltage 5-10V DC
Bridge Configuration Quarter, half or full bridge

Standards

ISO 376, DIN 51221

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Strain Gauge / Piezoresistor.

Parent Products

This component is used in the following industrial products

Pressure Sensor/Transducer

A device that converts pressure into an electrical signal for measurement and control.

View Product Details

Engineering Analysis

Risks & Mitigation

Temperature sensitivity causing measurement drift
Creep and hysteresis effects over time
Moisture ingress damaging electrical connections
Fatigue failure from cyclic loading
Adhesive failure compromising bond integrity

FMEA Triads

Trigger: Temperature fluctuations
Failure: Resistance drift and measurement inaccuracy
Mitigation: Implement temperature compensation circuits, use temperature-stable materials, and maintain operating within specified temperature ranges

Trigger: Mechanical overpressure
Failure: Permanent deformation or rupture of sensing element
Mitigation: Install pressure relief valves, use pressure limiters, and specify sensors with appropriate pressure ratings

Trigger: Environmental contamination
Failure: Corrosion or short circuits
Mitigation: Apply protective coatings, use hermetic sealing, and maintain clean operating environments

Industrial Ecosystem

Compatible With

Interchangeable Parts

Compliance & Inspection

Tolerance

±0.25% of full scale for standard industrial applications, ±0.1% for precision applications

Test Method

Calibration against traceable pressure standards, temperature cycling tests, long-term stability testing, vibration and shock resistance testing per ISO 376

Procurement Evaluation Criteria

Not customer reviews or live demand data. These dimensions support RFQ preparation and supplier evaluation.

Technical documentation

4/5

Manufacturing capability

4/5

Inspection readiness

5/5

Supplier transparency

3/5

These scores are example evaluation dimensions, not real customer ratings, country-specific buyer feedback, or live inquiry activity.

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Frequently Asked Questions

What is the difference between strain gauge and piezoresistor?

Strain gauges typically use metallic foil that changes resistance due to geometric deformation, while piezoresistors use semiconductor materials where resistance changes due to the piezoresistive effect in the crystal structure. Piezoresistors generally have higher gauge factors but are more temperature sensitive.

How are strain gauges installed in pressure sensors?

They are bonded to a diaphragm or beam using specialized adhesives, precisely aligned to measure strain in the desired direction. The installation requires surface preparation, proper adhesive curing, and protective coating to ensure long-term stability and accuracy.

Can I contact factories directly?

Yes, each factory profile provides direct contact information.

Data Basis

CNFX manufacturer profiles, technical classification, publicly available product information, and ongoing plausibility checks.

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.

Strain Gauge / Piezoresistor