Which sensor uses a spiral-wound tubular element that coils and uncoils with pressure changes?

Which sensor uses a spiral-wound tubular element that coils and uncoils with pressure changes?

• A. Bellows sensor
• B. Float type
• C. Helical sensor
• D. Bourbon tube

Answer: (C)

A spiral-wound, or helical, sensor uses a tube formed into a coil that tightens or loosens as pressure changes. That coil-like element converts pressure-induced deformation into linear motion, which is then read by the transmitter or gauge. This makes it distinct from other sensors: a bellows sensor relies on folded, expandable metal chambers; a float-type uses buoyancy in a liquid to move a float; and a Bourdon tube uses a curved tube that tends to straighten rather than coil. So the spiral-wound element is the feature that produces the coiling and uncoiling motion with pressure.

A spiral-wound, or helical, sensor uses a tube formed into a coil that tightens or loosens as pressure changes. That coil-like element converts pressure-induced deformation into linear motion, which is then read by the transmitter or gauge. This makes it distinct from other sensors: a bellows sensor relies on folded, expandable metal chambers; a float-type uses buoyancy in a liquid to move a float; and a Bourdon tube uses a curved tube that tends to straighten rather than coil. So the spiral-wound element is the feature that produces the coiling and uncoiling motion with pressure.