Strain Gauge / Piezoresistor: Strain Range ±5000 με

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

Parameter	Typical range	Notes & selection driver
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

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 376, DIN 51221

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

Typical Suppliers & Equivalents

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

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

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Manufacturers of Strain Gauge / Piezoresistor

Manufacturer profiles associated with Strain Gauge / Piezoresistor.

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Compiled and source-reviewed by the CNFX editorial team. Each manufacturer above links to the page on that company's own website where the product is listed, with the date we checked it. How we source and review

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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.

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.

Strain Gauge / Piezoresistor