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The bourdon tube pressure instrument is one
of the oldest pressure sensing instruments in use today. The
bourdon tube (refer to Figure A-1) consists of a thin-walled
tube that is flattened diametrically on opposite sides to
produce a cross-sectional area elliptical in shape, having
two long flat sides and two short round sides. The tube is
bent lengthwise into an arc of a circle of 270 to 300
degrees. Pressure applied to the inside of the tube causes
distention of the flat sections and tends to restore its
original round cross-section. This change in cross-section
causes the tube to straighten slightly. Since the tube is
permanently fastened at one end, the tip of the tube traces a
curve that is the result of the change in angular position
with respect to the center. Within limits, the movement of
the tip of the tube can then be used to position a pointer or
to develop an equivalent electrical signal to indicate the
value of the applied internal pressure.
Figure A-1
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