Functional description

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Strain gauge are used for detecting the pressure. A steel membrane equipped with strain gauge in the sensor is deformed by the adjacent pressure. The changes in resistance in the strain gauge are electronically detected by a Wheatstone bridge and evaluated. The measured voltage is then used as an actual value in the rail pressure control.

Fig 1: Identifying Rail Pressure Sensor, Fuel-Distribution Rail, Three-Pin Plug Connection

Courtesy of BMW OF NORTH AMERICA, INC.

Item	Explanation
1	three-pin plug connection
2	Rail pressure sensor
3	Fuel-distribution rail