A Bourdon tube is a way of measuring pressure. Patented in 1849 by Edward Bourdon, the Bourdon pressure gauge was lauded for its accuracy, sensitivity, and linearity relative to other methods of measuring pressure. Probably every mechanical dial-type pressure gauge you've ever seen is based on a Bourdon tube.

The Bourdon pressure gauge works by measuring the amount of change in a coiled or semicircular metal tube by a pressurized fluid inside. This is due to the principle that a flattened tube tends to regain its circular form when pressurized.

Bourdon tube pressure gauges are used for the measurement of relative pressures from 0.6 ... 7,000 bar. They are classified as mechanical pressure measuring instruments and thus operate without any electrical power.

We deliver Bourdon tube pressure gauges with various common worldwide measuring ranges, process connections, approvals, and nominal sizes.

For critical applications, there are Bourdon tube pressure gauges with liquid filling. Through the case liquid, precise readability is ensured, even with high dynamic pressure loads. It damps the moving parts within the case and thus prevents damage and increased wear.