Electricity: electrical systems and devices – Housing or mounting assemblies with diverse electrical... – For electronic systems and devices
Patent
1994-06-01
1995-08-08
Tolin, Gerald P.
Electricity: electrical systems and devices
Housing or mounting assemblies with diverse electrical...
For electronic systems and devices
200 612, 200295, 248 271, 361284, 361752, 403259, H01H 920, H02B 704
Patent
active
054404550
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
The invention pertains to a device for fastening a housing, in particular the electronics housing of a data sensing element, with a screw insert for fastening the data sensing element in the wall which encloses the medium to be measured, a sensor for physically recording the data, and a separable connection by means of which the electronics housing is connected with the screw insert as well as fixed and retained in its axially symmetric position relative to the sensor.
Housings of this type have the purpose of enclosing the electronic circuits as well as the electronic connecting elements of sensors such that they are insulated and protected against the environment. This is necessary because sensors of this type are used to detect the physical properties of the media. In this, the sensors situated at the measuring point are exposed to a wide variety of damaging environmental influences.
Sensors of this type are usually physical data sensing elements which determine the physical properties of the media, e.g., the level, the pressure, the temperature, etc. Such a data sensing element may, for example, be a capacitive probe, a vibration limit switch, a pressure sensor, a temperature sensor, or a different type of sensor. In order to fulfill their function, these data sensing elements are, in addition to the means for recording the data physically, also equipped with electric components by means of which the physical data is transformed into an electrical signal. These electrical components are realized as an electronic circuit on a printed circuit board.
If the data sensing element is, for example, a vibration limit switch, the sensor of which is used for determining and/or monitoring the level of a container, the electronics housing also encloses additional electronic circuits which have the purpose of exciting the sensor to oscillate. However, the connecting elements for the electrical connecting lines, by which the data sensing element receives the electrical energy required to fulfill is function and transmits the electrical signal to an evaluation device or an actuator arranged at a distance from the measuring point, are also enclosed by the electronics housing.
Due to the harsh environment at the measuring point, it is necessary to enclose the connection between the electronics housing and the screw insert at least to such an extent that it is sealed against dust and splashed water. This is the reason why the connection between these components is particularly important for maintaining the functional safety of such data sensing elements.
In order to connect the electrical connections to the electrical connecting elements which are enclosed by the electronics housing, it is necessary to align the electronics housing axially symmetrically in a position which corresponds with the connecting lines or other local conditions, despite the installation position required for the proper function of the sensor and the seal against the container wall. Thus, it is customary to design the electronics housing in such a way that it is fastened on the screw insert and may be turned by a certain axial angle as well as fixed in any favorable position with respect to the connection of the electrical connecting lines.
German Patent (ALS) No. 2,744,864, in particular FIGS. 1, 2, and 3, discloses a capacitive probe comprising a probe rod which represents the sensor, a screw insert for fastening the probe in a container wall, and the electronics housing. In order to realize the separable connection of the housing, three threaded bolts are distributed symmetrically on the screw insert, whereby these threaded bolts in association with three nuts form a separable connection between the electronics housing and the screw insert, and a seal and a clamping ring are inserted between the bolt and the nut.
Great Britain Patent No. 1,518,818, in particular FIG. 4, discloses a capacitive probe in which cylindrical screws and threaded bores form the separable connection between the electronics housing and the screw insert inst
REFERENCES:
patent: 3689013 (1972-09-01), Neugebauer
patent: 4465006 (1984-08-01), Dreier
patent: 4574328 (1986-03-01), Maier
patent: 5146056 (1992-09-01), Kuczynski
patent: 5230422 (1993-07-01), Karweik
patent: 5359497 (1994-10-01), Booth
Endress & Hauser GmbH & Co.
Tolin Gerald P.
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