CAPACITIVE LIQUID LEVEL SENSOR
First Claim
1. A capacitive sensor for the level of a liquid in a tank, including:
- a longitudinal and substantially flat support, intended to be placed in the tank, the support including;
a proximal part, a central part, and a distal part; and
connection means, located in the proximal part, to electrically connect the support and the outside of the support;
a first pair of electrodes, known as a measurement pair, including arms that are interdigital and placed on the support at least in its central part; and
a second pair of electrodes, known as a reference pair, including arms that are interdigital and placed on the support in its distal part;
wherein;
the support includes at least three layers; and
the reference pair is linked to at least one connection line located in an inner layer of the support and linked to the connection means.
1 Assignment
0 Petitions
Accused Products
Abstract
The invention relates to a capacitive sensor (2) for detecting the level (52) of a liquid (54) in a tank (48). The inventive sensor consists of: a flat longitudinal support (4) comprising proximal (8), central (10) and distal (12) parts and connection means (6) which are located in the proximal part (8) and which are used to connect the support (4) and the exterior of the support (4) electrically; a measuring pair (14) comprising interdigital arms which are disposed on the support (4) at least in the central part (10) thereof; and a reference pair (16) comprising interdigital arms which are disposed on the support (4) in the distal part (12) thereof. The aforementioned support (4) comprises at least three layers, and the reference pair (16) is linked to at least one connection track (26) which is located in an inner layer (24) of the support (4) and which is linked to the above-mentioned connection means (6). The invention also relates to a tank (48) comprising one such sensor (2).
36 Citations
11 Claims
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1. A capacitive sensor for the level of a liquid in a tank, including:
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a longitudinal and substantially flat support, intended to be placed in the tank, the support including; a proximal part, a central part, and a distal part; and connection means, located in the proximal part, to electrically connect the support and the outside of the support; a first pair of electrodes, known as a measurement pair, including arms that are interdigital and placed on the support at least in its central part; and a second pair of electrodes, known as a reference pair, including arms that are interdigital and placed on the support in its distal part; wherein; the support includes at least three layers; and the reference pair is linked to at least one connection line located in an inner layer of the support and linked to the connection means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
in which the inner layer includes an additional line parallel to the connection line and separated from the connection line by a second dielectric of a similar type to that used for the protective layer, intended to form an additional capacitance so as to compensate, at least partially, for variations in the dielectric constant of the materials forming the protective layer.
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11. A tank including a sensor according to claim 1.
Specification