Why might a Bourdon tube be manufactured in the shape of a helix?

A Bourdon tube made in the shape of a helix is designed to function effectively in pressure measurement applications, particularly because it allows for a mechanical advantage in transmitting motion. The helical shape of the tube helps to enhance the rotation generated from pressure changes, which is crucial for actuating devices like pressure gauges or recorders. By utilizing a helical form, the Bourdon tube can produce sufficient rotational displacement to move the arms or pens of a recording instrument without the need for complex gear assemblies. This design choice optimizes the device for accurate readings and can facilitate a more direct and straightforward mechanical link, ensuring reliable performance over time.

The other options are less relevant because they address different aspects not directly related to the primary function of a helical Bourdon tube in mechanical pressure measurement. For instance, pressure sensitivity is not inherently reduced simply by adopting a helical configuration. Installation ease might be a consideration, but the primary advantage of a helical shape lies in its efficiency in producing motion. Lastly, while durability may be a factor in overall design, the specific helix shape is primarily about enhancing mechanical output rather than solely improving durability.