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2. Pressure switch - Wikipedia

   en.wikipedia.org/wiki/Pressure_switch

   Industrial pressure switches may have a calibrated scale and pointer to show the set point of the switch. A pressure switch will have a hysteresis, that is, a differential range around its setpoint, known as the switch's deadband, inside which small changes of pressure do not influence the state of the contacts. Some types allow adjustment of ...

3. Pressure measurement - Wikipedia

   en.wikipedia.org/wiki/Pressure_measurement

   Differential pressure gauges have two inlet ports, each connected to one of the volumes whose pressure is to be monitored. In effect, such a gauge performs the mathematical operation of subtraction through mechanical means, obviating the need for an operator or control system to watch two separate gauges and determine the difference in readings.

4. Brake fluid pressure sensor - Wikipedia

   en.wikipedia.org/wiki/Brake_fluid_pressure_sensor

   The fault could be lack of hydraulic fluid, low brake fluid in the reservoir, a broken hydraulic line or a bad master brake cylinder.The sensor is used to detect pressure differentials in the hydraulic system.

5. List of sensors - Wikipedia

   en.wikipedia.org/wiki/List_of_sensors

   Linear variable differential transformer ... Time pressure gauge; Force, density, level ... Touch switch; Wired glove; Sensor technology

6. Mercury pressure gauge - Wikipedia

   en.wikipedia.org/wiki/Mercury_pressure_gauge

   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.

7. Pressure head - Wikipedia

   en.wikipedia.org/wiki/Pressure_head

   The meter is "read" as a differential pressure head in centimeters or inches of water. The venturi meter and manometer is a common type of flow meter which can be used in many fluid applications to convert differential pressure heads into volumetric flow rate, linear fluid speed, or mass flow rate using Bernoulli's principle.