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In 1849, B. Schäffer patented the design of a diaphragm pressure gauge. The following year he formed a business partnership with his brother-in-law C.F. Budenberg, The Schäffer & Budenberg Machinery & Boiler Fittings Company, in the altstadt of the Prussian town of Magdeburg Germany. They began manufacturing pressure gauges and all items ...
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Example of the widely used Bourdon pressure gauge Checking tire pressure with a spring and piston tire-pressure gauge. Pressure measurement is the measurement of an applied force by a fluid (liquid or gas) on a surface. Pressure is typically measured in units of force per unit of surface area.
An open (differential) mercury pressure gauge. A mercury pressure gauge is a type of manometer using mercury as the working fluid. The most basic form of this instrument is a U-shaped glass tube filled with mercury. More complex versions deal with very high pressure or have better means of filling with mercury.
The power consumption is drastically reduced compared to continuously operated Pirani gauges. The gauge's thermal influence on the real measurement is lowered considerably due to the low temperature threshold of 80 °C and the ramp heating in pulsed mode. The pulsed mode can be efficiently implemented using modern microprocessors. Disadvantages
10 kPa 1.5 psi Pressure increase per meter of a water column [26]: 10 kPa 1.5 psi Decrease in air pressure when going from Earth sea level to 1000 m elevation [citation needed]
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