Editorial Technical Reference

Pressure Sensing Element

This page explains how Pressure Sensing Element is classified within Machinery and Equipment Manufacturing. Technical values and manufacturer relationships are research references; confirm the current specification and supplier evidence for each order.

Technical Definition & Core Assembly

The core component within a pressure sensor/transmitter that directly converts applied pressure into a measurable physical change.

Representative product image. Confirm appearance and specifications with the manufacturer.

Product Specifications

Technical details and manufacturing context for Pressure Sensing Element

Definition
A pressure sensing element is the fundamental component of a pressure sensor or transmitter responsible for detecting and responding to pressure variations. It serves as the primary interface between the measured pressure medium and the sensor's internal measurement system, generating a proportional output signal (e.g., electrical, mechanical) based on the applied force. Its performance directly determines the sensor's accuracy, range, and reliability.

This element is typically a diaphragm, strain gauge, or piezoelectric crystal that deforms under pressure. The deformation alters a physical property such as electrical resistance, capacitance, or charge, which is then converted into a standardized electrical signal by the sensor's circuitry. Common materials include stainless steel, silicon, and ceramic, each offering distinct advantages in terms of corrosion resistance, sensitivity, and temperature stability.

When selecting a pressure sensing element, key parameters must be considered: pressure range (0–100 MPa), accuracy (±0.25% FS per IEC 60770), output signal (4–20 mA), supply voltage (12–36 V DC), operating temperature (-40–85 °C), compensated temperature range (-20–80 °C), overpressure capability (2× FS), burst pressure (3× FS), ingress protection (IP65–IP67 per IEC 60529), response time (≤10 ms), insulation resistance (≥100 MΩ at 500 V DC), wetted parts material (316L stainless steel per ASTM A240), and weight (150–250 g). These values are reference ranges and must be verified for the specific model and application.

Verification questions include: What is the exact pressure range and accuracy for the intended process? Are the wetted parts compatible with the media? What are the environmental conditions (temperature, humidity, vibration)? Does the output signal match the control system input? Maintenance signals include drift in output, slow response, or physical damage. Failure boundaries include exceeding burst pressure or operating outside the compensated temperature range. Always confirm model-specific values and standards with the legal manufacturer or supplier.
Working Principle
The element deforms (e.g., stretches, compresses, bends) under applied pressure. This deformation alters a physical property (e.g., electrical resistance in a strain gauge, capacitance in a diaphragm, piezoelectric charge in a crystal) which is then converted into a standardized electrical signal by the sensor's circuitry. The output signal is proportional to the applied pressure, allowing accurate measurement and control.
Common Materials
Stainless Steel, Silicon, Ceramic
Technical Parameters
ParameterTypical rangeNotes & selection driver
Pressure Range0–100 MPaSelect range to cover expected operating pressure with margin.
Accuracy±0.25 % FSHigher accuracy for critical applications.IEC 60770
Output Signal4–20 mATwo-wire loop powered.
Supply Voltage12–36 V DCReverse polarity protected.
Operating Temperature-40–85 °CCompensated range -20–80 °C.
Compensated Temperature Range-20–80 °CWithin this range accuracy is guaranteed.
Overpressure FSNo damage up to 2× full scale.
Burst Pressure FSHousing rupture at 3× full scale.
Ingress ProtectionIP65–IP67Suitable for harsh environments.IEC 60529
Response Time≤10 msFor dynamic pressure changes.
Insulation Resistance≥100 At 500 V DC.
Material (Wetted Parts)316LStainless steel for corrosion resistance.ASTM A240
Weight150–250 gVaries with pressure range and connection.

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Components / BOM
  • Diaphragm Part
    Flexible membrane that deflects under applied pressure, transmitting force to the sensing mechanism.
    Material: Stainless Steel
  • Strain Gauge Part
    Converts the diaphragm's mechanical strain into a proportional change in electrical resistance.
    Material: Silicon/Constantan
  • Seal/Weld Part
    Provides a hermetic or robust seal isolating the sensing element from the process medium and environment.
    Material: Stainless Steel/Epoxy
  • Piezoelectric Crystal Optional
    Puts out a charge directly under stress, in place of the strain gauge on piezo builds.

Applied To / Applications

This component is essential for the following industrial systems and equipment:

Industrial Ecosystem & Supply Chain Structure

Complementary Systems
Downstream Applications
Specialized Tooling

Application Fit & Sizing Matrix

Operational Limits
pressure: 0 to 10,000 psi (depends on specific model)
other spec: Media compatibility, response time <10ms, accuracy ±0.25% FS
temperature: -40°C to 125°C
Media Compatibility
✓ Hydraulic fluids ✓ Industrial gases (non-corrosive) ✓ Water/glycol mixtures
Unsuitable: Hydrofluoric acid or highly caustic media
Sizing Data Required
  • Pressure range (min/max operating pressure)
  • Process media type and compatibility
  • Required accuracy and response time

Reliability & Engineering Risk Analysis

Failure Mode & Root Cause
Diaphragm fatigue cracking
Cause: Cyclic pressure fluctuations exceeding design limits, leading to material fatigue and eventual rupture
Sensor drift/calibration loss
Cause: Thermal cycling, mechanical vibration, or chemical contamination affecting sensing element stability
Maintenance Indicators
  • Erratic or unstable pressure readings during steady-state operation
  • Visible physical damage (dents, cracks, corrosion) on sensing element housing
Engineering Tips
  • Install pulsation dampeners or snubbers to reduce pressure cycling amplitude and frequency
  • Implement regular calibration schedules with temperature compensation and verify against master gauges

Indicative industry ranges for design and RFQ preparation. Confirm the exact figures and applicable standard with the manufacturer before specifying.

Compliance & Manufacturing Standards

Applicable Standards
ISO 1127:1992 - Stainless steel tubes for pressure purposes ANSI/ASME B40.1 - Gauges: Pressure Indicating Dial Type - Elastic Element DIN EN 837-1 - Pressure gauges - Part 1: Bourdon tube pressure gauges

Quoted from the published standard.

Manufacturing Precision
  • Bore diameter: +/-0.01mm
  • Flatness: 0.05mm
Quality Inspection
  • Hydrostatic pressure test
  • Dye penetrant test

Manufacturers of Pressure Sensing Element

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Frequently Asked Questions

What is the typical pressure range for a pressure sensing element?

The pressure range can vary widely depending on the application. In the reference data, a range of 0–100 MPa is listed, but you must select a range that covers your expected operating pressure with margin. Always verify the exact range for the specific model.

What materials are commonly used for pressure sensing elements?

Common materials include stainless steel, silicon, and ceramic. Stainless steel (e.g., 316L) offers corrosion resistance, silicon provides high sensitivity, and ceramic is suitable for harsh environments. The choice depends on the media and operating conditions.

How does temperature affect the performance of a pressure sensing element?

Temperature can cause drift and affect accuracy. The compensated temperature range (-20–80 °C) is where accuracy is guaranteed. Operating outside this range may degrade performance. The operating temperature range is -40–85 °C, but accuracy is only specified within the compensated range.

What is the difference between overpressure and burst pressure?

Overpressure is the maximum pressure the element can withstand without damage, typically 2× full scale. Burst pressure is the pressure at which the housing ruptures, typically 3× full scale. Exceeding these limits can cause permanent damage or failure.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records.

Preliminary Technical Classification
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