Device for determining a physical value of a liquid flowing in a pipe
View Patent ↗A device for determining a physical value of a liquid flowing in a pipe, without contact with the liquid. The device includes: a sensor for the physical value; a connector to insert into the pipe and including: an internal passage extending between two apertures, a flexible membrane for a pressure sensor, forming a wall of the internal passage; and a fastening mechanism for fastening the sensor onto the connector. The sensor is a temperature sensor fastened to the connector with the sensitive part of the sensor turned towards the membrane.
1. A device for determining a physical value of a liquid flowing in a pipe, without contact with said liquid, said device comprising:
a sensor for sensing said physical value;
a connector to insert into said pipe and comprising:
an internal passage extending between two apertures,
a flexible membrane adapted to cooperate with a pressure sensor to determine the pressure of said flowing liquid, and also adapted to cooperate with a temperature sensor to determine the temperature of said flowing liquid, said flexible membrane forming a wall of said internal passage; and
means for fastening said sensor onto said connector;
wherein said sensor is a temperature sensor fastened to said connector with the sensitive part of said sensor turned towards said membrane.
2. A device according to claim 1 , wherein said sensor comprises an infrared temperature probe; and a sheath enveloping said probe and comprising at one of its longitudinal ends, a stiff plate provided with an aperture; said plate being disposed between said membrane and said sensitive part to stiffen said membrane.
3. A device according to claim 2 , wherein said sensor comprises an obturating lid formed from an opaque film, said lid covering the face of said plate turned towards said membrane.
4. A device according to claim 3 , wherein it comprises means for positioning said sensor relative to said connector in order for said lid to be in contact with a face of said membrane.
5. A device according to claim 4 , wherein said positioning means comprise a shoulder adapted to cooperate in abutment with a collar.
6. A device according to claim 3 , wherein said lid has constant emissivity in the temperature range from 4 to 40 degrees Celsius.
7. A device according to claim 2 , wherein said sheath comprises a cup and a cap assembled together by screwing.
8. A device according to claim 7 , wherein said cap comprises a breech of which the back is formed by said stiff plate.
9. A device according to claim 1 , wherein said sensor comprises an infrared temperature probe, and said probe comprises a head accommodating a converging lens.
10. A device according to claim 1 , wherein said fastening means comprise a tapping adapted to cooperate with a screw thread.
11. A device according to claim 1 , wherein said connector is disposable whereas said sensor is re-usable.
12. A device according to claim 1 , wherein said connector has a T-shaped profile.