Piezoresistive Pressure Sensor

Overview of Piezoresistive Pressure Sensor 

The Piezoresistive Pressure Sensor operates by enclosing a high-sensitivity silicon piezoresistive chip inside a protective pressure port. When the target fluid or gas exerts pressure through the interface onto the silicon element, the localized mechanical stress causes a proportional change in the material's electrical resistance. This change outputs a linear, millivolt-level DC voltage signal. To combat environmental drift, a specialized thick-film resistor network is laser-trimmed during automated manufacturing, stabilizing both the sensor’s zero-point and thermal performance across its compensated range.

Features of Piezoresistive Pressure Sensor

• Advanced Laser Trimming: Thick-film resistor networks are finely adjusted via laser processing to compensate for inherent zero-point and thermal drift errors.

• Versatile Pressure Types: Supports multiple pressure references including Gauge Pressure (relative to atmosphere), Absolute Pressure (relative to vacuum), and Sealed Gauge Pressure.

• Ultra-Compact Footprint: Small physical envelope enables easy integration into space-restricted equipment, manifolds, or handheld instruments.

• Constant Current Optimization: Designed to operate with a stable 1.5mA DC constant current supply for optimal sensor response and linearity.

• High Precision: Offers an exceptional typical accuracy of plus or minus 0.25% FS, ensuring reliable feedback for critical control applications.

• Proven Aerospace Reliability: Available in pressure interface configurations compliant with the HB4-3 standard, widely field-proven in military and commercial aviation systems.

Applications of Piezoresistive Pressure Sensor

• Aerospace and Avionics: Integrated into onboard aircraft systems, cabin air networks, and pneumatic monitoring lines requiring HB4-3 compliant interfaces.

• Pressure Calibration Instruments: Serving as the high-accuracy reference core inside portable calibrators and laboratory deadweight testers.

• Automotive Electronics: Monitoring non-conductive fluid loops, manifold air pressures, and specialized testing diagnostics.

• Industrial Process Control: Regulating low-to-medium pressure pipelines and factory automation systems managing non-corrosive gases and liquids.

• Barometric and Climate Control: Precise ambient and sealed pressure tracking in environmental test chambers and cleanrooms.

Price of Piezoresistive Pressure Sensor 

The price of the Piezoresistive Pressure Sensor is influenced by the selected pressure reference type (absolute, gauge, or sealed gauge), the exact pressure range (from micro-ranges of 0.02MPa up to 7MPa), and compliance requirements such as the aerospace HB4-3 interface standard. Standard configurations for non-conductive media offer a highly cost-effective sensing core for high-volume equipment manufacturers. For specific bulk or contract pricing details, please reach out to the ZINACA Instruments sales engineering division.

OEM Service 

ZINACA provides dedicated OEM design services for silicon piezoresistive sensors:

• Interface Customization: Machining custom thread profiles, port dimensions, or manufacturing specific housings that match HB4-3 aviation standards.

• Custom Calibration: Factory calibration and matching of thick-film resistor values to accommodate unique operating temperature windows outside the standard range.

• Housing and Encapsulation: Tailoring the outer sensor structure to fit specific manifold blocks or small-footprint electronic enclosures.

• Private Labeling: Clean laser-marking of corporate branding, proprietary model codes, and production lot numbering for full supply-chain traceability.

Technical Specifications