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The closed end of the bourdon tube is attached to a mechanical linkage Absolute pressure ranges as low as 0 -100 mm Hg and gauge pressure ranges as low as 0 -5 inches H 2 O 0 -125 mm H 2 0 are available
A wide range of materials can be used for the sensing film, from rubber to plastic for low-pressure devices, silicon for medium pressures, to stainless steel for high pressures Diaphragms: They consist of a thin layer or disk of a material supported on a rigid frame

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As pressure is applied internally through the open end, the increased pressure causes the flattened cross section to become more circulars and the shape to straighten.

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Heavy-duty units can measure up to 0 -100,000 psig
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Due to their robust construction, bourdon are often used in harsh environments and high pressures, but can also be used for very low pressures; the response time however, is slower than the bellows or diaphragm
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When pressure is applied through an opening, the closed end extends axially
C-type bourdon C-type bourdon tubes are used for ranges as low as 0 — 15 psig and as high as 0 — 1500 psig Helical bourdon Helical bourdon tubes are used for ranges as low as 0 — 200 psig up to 0 — 6000 psig Spiral bourdon Very sensitive units are manufactured to measure as low as 0 -10 psig When pressure is applied to one side of the diaphragm it will deflect
The linkage is connected to a pointer or other output device , the tube returns to its original form when the pressure is released There are three common types of bourdon tubes, the C-shape, the spiral, and the helix

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A bellows sensor can accurately measure much lower pressures than a bourdon tube.

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Deflection is proportional to the pressure
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This moves the closed end
ضغط جوي
Bourdon Tubes: It works on a simple principle that a bent tube will change its shape when exposed to variations of internal and external pressure