Bourdon tube

Pressure can be measured using an aneroid, Bourdon tube, mercury column, or various other methods.

The Bourdon tube is separate from the face of the gauge and thus has no effect on the actual reading of pressure.

For critical applications a diaphragm sealing is used instead of a bourdon tube in the gauge.

Its sensitivity is approximately that of a standard 6-inch dial gauge of the Bourdon tube type.

The chamber pressure was measured by a bourdon tube, calibrated to indicate decompression status.

Differential pressure can be measured by gauges containing two different Bourdon tubes, with connecting linkages.

Moving end of Bourdon tube.

Bourdon tube pressure gauges.

The use of bourdon tube, diaphragm, and digital depth gauges may require adjustment for use at altitude.

Some aneroid barometers use Bourdon tubes closed at both ends (but most use diaphragms or capsules, see below).

Eugene Bourdon fulfilled the need for high pressure measurement with his Bourdon tube pressure gage.

This joins the inlet pipe to the fixed end of the Bourdon tube (1) and secures the chassis plate (B).

(These two pressures are not pressures in the usual sense - they cannot be measured using an aneroid, Bourdon tube or mercury column.)

A pressure gauge of quartz spiral Bourdon tube type as a primary manometer is used to measure the CO2 and the carrier gas pressure precisely.

The Bourdon gauge or Bourdon tube is named after the Eugène Bourdon below.

For this to operate, fuel, air and steam pressure can be converted to electrical signals by means of bellows, a bourdon tube, or a diaphragm-operated mercury switch.

One sensitive type of pressure switch uses mercury switches mounted on a Bourdon tube; the shifting weight of the mercury provides a useful over-center characteristic.

But in 1875 after Bourdon's patents expired, his company Schaeffer and Budenberg also manufactured Bourdon tube gauges.

Bourdon tubes measure gauge pressure, relative to ambient atmospheric pressure, as opposed to absolute pressure; vacuum is sensed as a reverse motion.

In 1881 Immisch obtained a patent for a remarkably small watch-shaped thermometer, functioning on the variable expansive properties of fluid in a Bourdon tube.

The test force is applied to a piston or diaphragm and transmitted through hydraulic lines to a dial indicator based on a Bourdon tube or electronic sensor.

A pressure switch for sensing fluid pressure contains a capsule, bellows, Bourdon tube, diaphragm or piston element that deforms or displaces proportionally to the applied pressure.

'Mechanical' or 'elastic' gauges depend on a Bourdon tube, diaphragm, or capsule, usually made of metal, which will change shape in response to the pressure of the region in question.

A pressure switch can be made with a Bourdon tube and a mercury switch; the switch can be reliably operated by the small force generated by the tube.

The Bourdon tube gauge, in which the pressure straightens an oval-section, coiled tube of brass or bronze connected to a pointer, was introduced in 1849 and quickly gained acceptance.