Measuring and testing – Fluid pressure gauge – Null balance type
Patent
1993-01-15
1994-09-06
Chilcot, Jr., Richard E.
Measuring and testing
Fluid pressure gauge
Null balance type
73705, 73751, 737291, G01L 700
Patent
active
053437535
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a device for detecting and transmitting a pneumatic micro signal for emission of analog or digital signal, more precisely for the transmission of signals generated by pressure or differential pressure or depression transmitters.
2. Description of the Prior Art
Pressure or depression detectors employing air microwave are known, which use a tube of small dimensions containing a small mobile ball capable of moving in the tube under the action of a pressure or a depression applied to one or the other of its ends. The movement of the ball is detected by one or more detectors which furnish an analog or digital signal reflecting the air micro-wave emitted. The extreme sensitivity of this type of detector, and the fact that it necessitates only a very low consumption of air, renders it adapted for use in a zone remote from a source of electrical energy. However, the supply of air, however small it is, must be very finely adjusted for the detector in question to be able to be used under the best conditions possible and in particular applications.
It is one of the merits of the Applicants to have precisely imagined a particular assembly of the air microwave ball detector, allowing the conversion of a collected micro signal into an analog or digital opto-electronic signal.
SUMMARY OF THE INVENTION
The invention thus has for its object a device for detecting and transmitting a pneumatic micro signal for emission of an analog or digital signal using an air micro-wave detector tube containing a displaceable ball, whose reciprocating movement is detected and transmitted by a detection unit using a plurality of optical fibers, said tube collecting the pressure and/or depression variations to be monitored, device according to which the detector tube is supplied with air at an adjustable pressure which is balanced by at least two adjustable leak flowrates, at least one on a conduit upstream of the tube and the other on a conduit downstream, in order to adjust the position of the path of the ball in the tube, a complementary means for adjusting the position of the ball being ensured by the manual inclination of the tube between an extreme vertical position and a position slightly inclined with respect to the horizontal.
According to another characteristic of the invention, the tube is integrated in a box constituting the module for converting a modulated pneumatic signal of 3 to 15 PSI, into modulated micro signal, and able to emit an analog or digital signal transmitted by the optical fibers, or the tube is integrated in a box constituting the transmission module of micro-pressures and of micro air flowrates with analog or digital output transmitted by the optical fibers, a source of air pressure being admitted to the box which presents a precision regulator flowmeter.
According to another particular characteristic of the invention, two U-tubes terminated in two small compartments filled with water serve as interface between a taking of measurement and the transmission module, measurement-taking being ensured at two points of a conduit each connected to the closed head of a compartment, each other compartment being connected to the module by a bubbling tube immersed in the corresponding compartment communicating with the free air via an orifice.
Other particular characteristics, the advantages and preferred applications will appear on reading the following description, reference being made to the accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
FIGS. 1 and 2, schematic views in elevation of boxes constituting the converter and transmission modules of the device.
FIG. 3, a schematic view of a measurement interface constituted by U-tubes.
FIG. 4, a schematic view of another measurement interface.
FIG. 5, a schematic view of an application of measurement in depression to a sensitive floor.
FIG. 6, a view on a larger scale of the detector tube.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
FIG. 1 shows an essential element of the device
REFERENCES:
patent: 2403897 (1946-07-01), Aller
patent: 3914995 (1975-10-01), Yoshida
patent: 4583484 (1986-04-01), Freund
patent: 5056513 (1991-10-01), Boutin
Patent Abstracts of Japan, vol. 1, No. 58, 6 Jun. 1977, p. 119E77, & JP,A, 52/2457 (Sankyo Kogyo K.K.) 1 Oct. 1977.
Chilcot Jr. Richard E.
Felber Joseph L.
Societe Civile d'Etudes et de Recherches Revo'Reg
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