Bourdon Tube / Sensing Element: Hysteresis <0.5% of span

Q: What are the main types of Bourdon tube configurations?

C-shaped (most common), helical (for higher sensitivity), and spiral (for very low pressures) configurations, each offering different displacement characteristics for specific pressure ranges.

Q: How does temperature affect Bourdon tube accuracy?

Temperature changes cause thermal expansion/contraction of tube material, affecting elasticity and zero point. Compensation methods include bi-metal strips, liquid-filled cases, or temperature-corrected materials.

Q: What media are incompatible with standard Bourdon tubes?

Oxygen (requires degreased components), chlorine, ammonia, and other reactive chemicals may require special materials like Monel or stainless steel with appropriate passivation.

Component Specifications

Definition

A Bourdon tube is a curved, hollow metal tube with an elliptical cross-section that serves as the primary sensing element in mechanical pressure gauges. When internal pressure increases, the tube tends to straighten due to its elastic deformation, creating proportional mechanical displacement at the sealed tip. This displacement is mechanically amplified through linkages to drive the gauge pointer, providing visual pressure readings. The tube's geometry, material properties, and manufacturing precision determine its pressure range, accuracy, and hysteresis characteristics.

Working Principle

Operates on the elastic deformation principle: internal pressure applied to the sealed tube causes it to uncoil or straighten proportionally. The resulting tip displacement is mechanically transmitted to rotate the pointer via a sector-pinion or lever mechanism, converting pressure into angular movement.

Materials

Typically phosphor bronze, beryllium copper, stainless steel (304/316), or Monel for corrosive environments. Material selection depends on pressure range, media compatibility, and temperature conditions.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Hysteresis	<0.5% of span
Repeatability	±0.1% of span
Accuracy Class	±0.1% to ±2.5% of full scale
Pressure Range	0-0.6 bar to 0-700 bar
Temperature Range	-40°C to +120°C
Overpressure Safety	130% of full scale

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 16085, ASME B40.100

Parent Products

This component is used in the following industrial products

Pressure Gauge

A measuring instrument that monitors and displays the pressure within the Continuous Starch Hydrocyclone Separator system.

View Product Details

Engineering Analysis

Risks & Mitigation

Fatigue failure from pressure cycling
Corrosion from incompatible media
Overpressure damage exceeding design limits
Mechanical linkage wear affecting accuracy

FMEA Triads

Trigger: Material fatigue from continuous pressure cycling
Failure: Crack formation leading to leakage or rupture
Mitigation: Regular calibration, pressure limiters, material selection based on cycle life

Trigger: Corrosive media attack
Failure: Wall thinning and eventual rupture
Mitigation: Compatible material selection, protective coatings, diaphragm seals

Trigger: Mechanical linkage wear
Failure: Increased hysteresis and reduced accuracy
Mitigation: Regular maintenance, lubrication, replacement of worn components

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

±0.5% to ±2.5% of full scale depending on accuracy class

Test Method

Deadweight tester calibration, comparison against reference standard, hysteresis and repeatability testing per ISO 5171

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 Bourdon Tube / Sensing Element

Manufacturer profiles associated with Bourdon Tube / Sensing Element.

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Frequently Asked Questions

What are the main types of Bourdon tube configurations?