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2. Pressure switch - Wikipedia

   en.wikipedia.org/wiki/Pressure_switch

   Murphy oil pressure gauges with switches that activate on low pressure. A pressure switch is a form of switch that operates an electrical contact when a certain set fluid pressure has been reached on its input. The switch may be designed to make contact either on pressure rise or on pressure fall.

3. Oil pressure - Wikipedia

   en.wikipedia.org/wiki/Oil_pressure

   Murphy oil pressure gauges with switches that activate on low pressure. Oil pressure is an important factor in the longevity of most internal combustion engines. [1] With a forced lubrication system (invented by Frederick Lanchester), oil is picked up by a positive displacement oil pump and forced through oil galleries (passageways) into bearings, such as the main bearings, big end bearings ...

4. Mercury pressure gauge - Wikipedia

   en.wikipedia.org/wiki/Mercury_pressure_gauge

   The parent of all mercury pressure gauges is the mercury barometer invented by Evangelista Torricelli in 1643. [15] An early engineering application of the mercury pressure gauge was to measure pressure in steam boilers during the age of steam. The first use on steam engines was by James Watt while developing the Watt steam engine between 1763 ...

5. MAP sensor - Wikipedia

   en.wikipedia.org/wiki/MAP_sensor

   MAP sensors measure absolute pressure. Boost sensors or gauges measure the amount of pressure above a set absolute pressure. That set absolute pressure is usually 100 kPa. This is commonly referred to as gauge pressure. Boost pressure is relative to absolute pressure - as one increases or decreases, so does the other.

6. Pressure measurement - Wikipedia

   en.wikipedia.org/wiki/Pressure_measurement

   Instruments used to measure and display pressure mechanically are called pressure gauges, vacuum gauges or compound gauges (vacuum & pressure). The widely used Bourdon gauge is a mechanical device, which both measures and indicates and is probably the best known type of gauge.

7. List of abbreviations in oil and gas exploration and production

   en.wikipedia.org/wiki/List_of_abbreviations_in...

   PBU – pressure build-up (applies to integrity testing on valves [citation needed]) PCA – production concession agreement; PCB – polychlorinated biphenyl; PCCC – pressure containing anti‐corrosion caps; PCCL – perforation casing collar locator log; PCDC – pressure-cased directional (geometry i.e. borehole survey) MWD tool