Bourdon tube sensing element converts fluid pressure into mechanical displacement for pressure gauges.
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.
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C-shaped (most common), helical (for higher sensitivity), and spiral (for very low pressures) configurations, each offering different displacement characteristics for specific pressure ranges.
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.
Oxygen (requires degreased components), chlorine, ammonia, and other reactive chemicals may require special materials like Monel or stainless steel with appropriate passivation.
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