A flow sensor for flowing media with a cylindrical housing (2) and with a sensor element located in the housing (2), the housing (2) preferably having an outside thread (3) and being screwable into a union (4) of a pipe (5) or into an opening of a connecting piece (43). The flow sensor (1) has very
A flow sensor for flowing media with a cylindrical housing (2) and with a sensor element located in the housing (2), the housing (2) preferably having an outside thread (3) and being screwable into a union (4) of a pipe (5) or into an opening of a connecting piece (43). The flow sensor (1) has very high measurement accuracy while still being economically producible. There is a lifting body (6) which projects into the flowing medium, the lifting body (6) being movably guided on the housing (2) and depending on the flow (7) of the medium to be monitored, can be moved against the reset force of a reset element which is located between the housing (2) and the lifting body (6), and the sensor element is made as a noncontact proximity switch (18, 20) which produces a signal that is dependent on the position of the lifting body (6).
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What is claimed is: 1. Flow sensor for flowing media, comprising: a cylindrical housing, and a sensor element located in the housing, a lifting body which, in an installed condition, is adapted to project into the flowing medium, and a reset element which is located between the housing and the lift
What is claimed is: 1. Flow sensor for flowing media, comprising: a cylindrical housing, and a sensor element located in the housing, a lifting body which, in an installed condition, is adapted to project into the flowing medium, and a reset element which is located between the housing and the lifting body, said reset element applying a reset force to the lifting body, wherein the lifting body is movably guided in the housing and being movable against the reset force of the reset element depending on the flow of the flowing medium, and wherein the sensor element is a noncontact proximity switch and produces a signal dependent on the position of the lifting body. 2. Flow sensor as claimed in claim 1, wherein the reset element is a spring element. 3. Flow sensor as claimed in claim 1, wherein the reset element is a magnetic reset element which comprises at least one magnet which is located in or connected to the lifting body and by at least one opposing magnet which is located coaxially in the housing relative to the at least one magnet. 4. Flow sensor as claimed in claim 1, wherein the reset element is an electromagnetic reset element which comprises at least one electromagnetic which is located in or connected to the lifting body and by an opposing coil which is located coaxially in the housing relative to the at least one electromagnetic. 5. Flow sensor as claimed in claim 3, wherein the at least one magnet in the lifting body is a bar magnet and wherein the magnet in the housing comprises at least one ring magnet. 6. Flow sensor as claimed in claim 1, wherein the lifting body has a peripheral collar, the collar being adapted to function as a check valve. 7. Flow sensor as claimed in claim 1, wherein the lifting body has a cylindrical section between an end of the lifting body which faces into the interior of the pipe in the installed state and the peripheral collar. 8. Flow sensor as claimed in claim 1, wherein the end of the lifting body projecting into the flowing medium in the installed state has a tapering tip. 9. Flow sensor as claimed in claim 1, wherein the lifting body has a section with a conicity of 0.5�� to 15��. 10. Flow sensor as claimed in claim 1, wherein the sensor element is a magnetic proximity switch, and wherein a permanent magnet is provided in the lifting body, that permanent magnet being adapted to actuate the magnetic proximity switch at a predetermined distance. 11. Flow sensor as claimed in claim 10, wherein the permanent magnet located in a hole in the lifting body and wherein the hole is sealed tight with a cover. 12. Flow sensor as claimed in claim 1, wherein the sensor element is an inductive proximity switch which is installed so as not to be flush. 13. Flow sensor as claimed in claim 12, wherein the sensor head of the inductive proximity switch has a pot-type core in addition to a coil. 14. Flow sensor as claimed in claim 12, wherein the sensor head of the inductive proximity switch has an air-core inductor. 15. Flow sensor as claimed in claim 1, wherein a hole is formed in an end of the housing which faces towards the lifting body, and wherein an end of the lifting body that faces out of the interior of the pipe in the installed state is cylindrical so that the lifting body is guided in the hole. 16. Flow sensor as claimed in claim 1, wherein an end of the housing that faces towards the lifting body has a guide pin and wherein at least an end of the lifting body that faces out of the interior of the pipe in the installed state is sleeve-shaped, the inside diameter of the sleeve-shaped part of the lifting body being larger than the outside diameter of the guide pin so that the lifting body is guided on the guide pin. 17. Flow sensor as claimed in claim 16, wherein the sensor element is an inductive proximity switch, wherein the sleeve-shaped part of the lifting body is made of metal and is an actuating element for the inductive proximity switch. 18. Flow sensor as claimed in claim 16, wherein the sensor element is an inductive proximity switch, wherein the sleeve-shaped part of the lifting body is made of a plastic, and wherein at least one ring of metal is located in the sleeve-shaped part. 19. Flow sensor as claimed in claim 1, wherein the lifting body comprises two parts, a first part of the lifting body being adapted to face into the interior of the pipe in the installed state and a second part of the lifting body which is adapted to face out of the interior of the pipe in the installed state are formed of different materials. 20. Flow sensor as claimed in claim 19, wherein the first part of the lifting body has a blind hole with an inside thread and the second part of the lifting body has a through hole, and wherein the two parts of the lifting body are connected to one another by means of a screw. 21. Flow sensor as claimed in claim 16, wherein the housing and the guide pin are two separate components. 22. Flow sensor as claimed in claim 21, wherein the housing has a peripheral shoulder and the guide pin has corresponding collar, and wherein the guide pin is attached in the housing such that the collar of the guide pin fixable on the shoulder of the housing by means of a cover which is screwed onto the housing. 23. Flow sensor as claimed in claim 1, wherein the housing and the cover are made of metal. 24. Flow sensor as claimed in claim 21, wherein the guide pin on an end facing away from the lifting body has an outside thread and wherein the housing has a corresponding inside thread so that the guide pin can be screwed into the housing. 25. Flow sensor as claimed in claim 1, wherein the proximity switch is located in the housing such that the distance of the proximity switch to the lifting body is adjustable. 26. Flow sensor as claimed in claim 25, wherein a mounting bracket on the end of the housing facing away from the lifting body, wherein an adjusting nut is provided between the end of the housing and the mounting bracket, the sensor element having an outside thread with at least one flattened lengthwise side, wherein an opening matched to the cross section of the sensor element is located in the mounting bracket, and wherein the adjustment nut has an inside thread which corresponds to the outside thread of the sensor element so that by twisting the adjustment nut the axial position of the sensor element can be set without the sensor element turning at the same time. 27. Flow sensor as claimed in claim 26, wherein a groove is provided in the front of the housing in which an O-ring is held, the adjustment being pressed lightly against the O-ring by the mounting bracket. 28. Flow sensor as claimed in claim 25, wherein the position of the proximity switch in the housing is directly readable on an end of the proximity switch which protrudes from the housing. 29. Flow sensor as claimed in claim 28, wherein the housing has an outside thread so that the housing can be screwed into a union of a pipe through which the medium flows. 30. Flow sensor as claimed in claim 29, wherein the proximity switch is adapted to deliver an analog signal which is dependent on the position of the lifting body and wherein a processing unit is provided which receives the analog signal and converts it into one of a binary, analog and digital output signal. 31. Flow sensor as claimed in claim 30, further comprising a threshold switch which converts the analog signal of the proximity switch into a binary output signal. 32. Flow sensor as claimed in claim 1, wherein the housing has an outside thread and is screwable into an opening of a connecting piece.
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