Gauges mechanical pressure

Mechanical Pressure Gauges The Bourdon-tube gauge indicates pressure by the amount of flection under internal pressure of an oval tube bent in an arc of a circle and closed at one end. These gauges are commercially available for all pressures below atmospheric and for pressures up to 700 MPa (about 100,000 Ibfliu") above atmospheric. Details on Bourdon-type gauges are given by Harland [Mach. Des., 40(22), 69-74 (Sept. 19, 1968)]. 

Those that are based on the measurement of the distortion of an elastic pressure chamber (mechanical pressure gauges such as Bourdon-tube gauges and diaphragm gauges)... 

Mechanical Pressure Gauges The Bourdon-tube gauge... 

A local mechanical pressure gauge can be used (if available). A precision pressure gauge may be installed in the system. 

Pressure can be measured by means of manometers which show the pressure in terms of the different levels of a liquid in a U-tube, by mechanical pressure gauges which record the differential effect of pressure forces on the inside and outside surfaces of a coiled tube, and electronic devices which measure the change of electrical characteristic of an element with pressure. 

The static eccentricity and attitude of the damper ring/bearing housing are monitored by mechanical clock gauges. Lubricant pressure is measured at the inlet to the housing and lubricant temperature is measured as it discharges from the annulus. 

Bourdon gauge (mechanical) 700 MPa 60 °C (brass) 300 °C (ss) Robust Vessel pressure Pump pressure... 

Classical pressure sensors are the purely mechanical pressure gauges (Table 14.2). Reasons for their wide use are robustness, low price, simple installation, and independence from electric power supplies. In the so-called Bourdon gauge, a dead-end tube in helical form with several turns expands due to elastic deformation when pressure is increased. This movement is transferred mechanically to a mostly circular scale. Although these instruments can be overloaded, it is common practice to operate them at no more than three-quarters of their full scale. These gauges are manufactured by a large number of companies and can be obtained in various qualities Table 14.3 gives advice on what to consider while choosing. 

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