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Smart phones and some computer devices come with pressure sensors. Sensors in those devices determine where the pressure has been applied and inform the processor by generating electric signal. There are two or more sensors fitted at the the corner of the screen to give precise location where actually the pressure has been applied.
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Figure 9. Pressure indication on a mobile phone with a touchscreen.
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Pressure sensors have a great application in automotive industry and security systems. They help to monitor oil and coolant pressure by regulating appropriate power pressure in accelerators and brakes. Pressure sensors are usually incorporated in the radiator's fill cap and the pressure inside the radiator ranges from 0.6 bar to 1.0 bar.
Figure . 10. Pressure control in a relief valve.
When the temperature of the coolant rises up then the pressured in the closed system also increases. This is then notified by the pressure sensor which opens the valve and the excess fluid is dumped into the overflow container.
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