1. A vacuum pump to create a reduced pressure, containing a chamber (14, 15) with an inlet (143) and an outlet (150), which is equipped with a valve (3), characterized in that the chamber (14, 15) of the pump is equipped with a sensor ( 23, 23 ′, 24) pressure. 2. The vacuum pump according to claim 1, wherein the pressure sensor comprises a sensor membrane (23, 23 ′). 3. A vacuum pump according to claim 2, wherein the sensor membrane (23, 23 ′) has a plate protrusion (24) configured to detect its position relative to the pump chamber (14, 15). 4. A vacuum pump according to claim 3, equipped with an optical detector means (6) for detecting the position of the plate protrusion (24) .5. The vacuum pump according to claim 4, wherein the optical detector means (6) comprises an optical radiation source (60) and a photodetector (62), and a plate protrusion (24) is mounted to advance by deflecting the sensor membrane (23, 23 ′) onto the optical the path between the indicated source (60) and the photodetector (62) .6. A vacuum pump according to claim 1, further comprising a vacuum membrane (20, 21) to create a reduced pressure in the chamber (14, 15) of the pump. The vacuum pump according to claim 6, wherein the pressure sensor comprises a sensor membrane (23, 23 ′), wherein the vacuum membrane (20, 21) and the sensor membrane (23, 23 ′) are made in one piece. A vacuum pump according to claim 7, wherein the sensor membrane (23) is a continuation of one side of the vacuum membrane (20, 21) .9. The vacuum pump according to claim 6, wherein the pressure sensor comprises a sensor membrane (23, 23 ′), the vacuum membrane (20, 21) and the sensor membrane (23 ′) being two parts made separately from one another. The vacuum pump according to claim 1, wherein the pump chamber �1. Вакуумный насос для создания пониженного давления, содержащий камеру (14, 15) с входным отверстием (143) и выходным отверстием (150), которое снабжено клапаном (3), отличающийся тем, что камера (14, 15) насоса
