3201 Lecture 1: Bourdon Pressure Gauge
Document Summary
It is an elastic element gauge instrument that utilizes an elastic primary sensing element. It detects pressure and transforms it into a mechanical signal with a proportional amplitude. The bourdon gauge is suitable for measuring high pressures such as those in a steam boiler or a water main and negative or vacuum pressures. A gauge that is devised to measure positive and negative pressures is called a compound gauge. This device comprises a metallic tube with an elliptical section closed at one end and fitted to the gauge point where the pressure is measured. The tube tends to straighten as fluid enters it. The small elastic deformation of the tube is amplified and communicated to a pointer via a pinion-sector arrangement. The device is calibrated by subjecting it to a variety of known pressures. The case holds all the moving parts of the pressure gauge in one place and protects the components from damage.
