INDUSTRY COMPONENT

Strain Gauge / Piezoresistor

Precision strain measurement component converting mechanical deformation into electrical resistance changes for pressure sensing applications.

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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.

strain gauge piezoresistor pressure sensor component strain measurement piezoresistive sensor pressure transducer element industrial sensing Strain Gauge / Piezoresistor Strain Gauge / Piezoresistor in Machinery and Equipment Manufacturing

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.

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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

Buyer Feedback

★★★★☆ 4.5 / 5.0 (13 reviews)

"Testing the Strain Gauge / Piezoresistor now; the technical reliability results are within 1% of the laboratory datasheet."

"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 Gauge / Piezoresistor meets all ISO standards."

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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.

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