Piezoresistive Bridge: Pressure Range 0-1000 bar

Q: What is the main advantage of a piezoresistive bridge over other pressure sensing technologies?

Piezoresistive bridges offer superior sensitivity, excellent linearity, and high accuracy across wide pressure ranges, making them ideal for precision applications in harsh environments.

Q: How does temperature affect piezoresistive bridge performance?

Temperature changes cause resistance variations that can affect accuracy. Most designs include temperature compensation circuits or use materials with low temperature coefficients to minimize this effect.

Q: What maintenance is required for piezoresistive bridges?

These components are generally maintenance-free but require protection from overpressure, moisture, and corrosive media. Regular calibration checks are recommended for critical applications.

Component Specifications

Definition

A piezoresistive bridge is a critical sensing element in precision pressure transducers, consisting of four piezoresistors arranged in a Wheatstone bridge configuration on a silicon diaphragm. When pressure is applied, the diaphragm deforms, causing strain that changes the resistance of the piezoresistors proportionally to the applied pressure. This change in resistance unbalances the bridge, producing a differential output voltage that is amplified and processed to provide an accurate pressure measurement. The component is known for high sensitivity, excellent linearity, and long-term stability in demanding industrial environments.

Working Principle

The piezoresistive bridge operates on the piezoresistive effect, where the electrical resistance of a semiconductor material changes when subjected to mechanical stress. In a Wheatstone bridge arrangement, two resistors increase in resistance while the other two decrease under applied pressure, creating a voltage differential proportional to the pressure. This analog signal is then converted to a digital output through signal conditioning circuits.

Materials

Typically made from monocrystalline silicon with doped piezoresistive regions (often boron or phosphorus), deposited on a silicon diaphragm. May include passivation layers of silicon nitride or silicon oxide for protection. Bonding wires are usually gold or aluminum.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Hysteresis	<0.05% FS
Sensitivity	0.1-10 mV/V/bar
Zero Offset	<1% FS
Nonlinearity	<0.1% FS
Pressure Range	0-1000 bar
Bridge Resistance	350-5000 ohms
Full Scale Output	100-300 mV/V
Temperature Range	-40°C to +125°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 5171, DIN 16086, IEC 60770

Parent Products

This component is used in the following industrial products

Precision Pressure Transducer Sensing Element

Core sensing component converting pressure variations into measurable electrical signals.

View Product Details

Engineering Analysis

Risks & Mitigation

Overpressure damage
Temperature drift
Moisture ingress
Electrostatic discharge (ESD) damage
Long-term drift

FMEA Triads

Trigger: Excessive pressure beyond rated limits
Failure: Diaphragm fracture or permanent deformation
Mitigation: Implement pressure relief valves and overpressure protection circuits

Trigger: Temperature cycling and thermal stress
Failure: Resistance drift and signal instability
Mitigation: Use temperature compensation algorithms and select materials with matched thermal coefficients

Trigger: Moisture penetration through packaging
Failure: Corrosion of bonding wires and electrical shorts
Mitigation: Apply hermetic sealing and conformal coatings

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

±0.25% of full scale for standard grade, ±0.1% for precision grade

Test Method

Pressure cycling test per ISO 5171, temperature compensation verification, long-term stability testing over 1000 hours

Procurement Evaluation Criteria

A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation

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Manufacturing capability

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Inspection readiness

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Frequently Asked Questions

What is the main advantage of a piezoresistive bridge over other pressure sensing technologies?