Filling level sensor
View Patent ↗A filling level sensor having a lever arm which has a float at one end and is held at its other end by a clip. A resistance network is arranged on a substrate and to which a contact structure is assigned, the resistance network producing an electrical signal for the filling level as a function of the pivoted position of a lever arm. The clip is composed of an electrically conductive plastic and has an electrical contact connected to the clip in an electrically conductive way, such that as the lever arm pivots said contact describes a circular path on the substrate. The area on the substrate over which the electrical contact passes is an electrically conductive contact face and is electrically conductively connected to a connecting line of the filling level sensor.
1. A filling lever sensor assembly comprising:
a lever arm;
a float at one end of the lever arm;
a clip composed of an electrically conductive plastic at another end of the lever arm configured to hold the lever arm,
a carrier comprised of plastic;
a bearing, arranged on the carrier, configured to mate with at least one of the clip and the lever arm;
a filling level sensor arranged on the carrier comprising:
a lid;
a substrate;
an electrically conductive contact face arranged on an outer surface of the substrate;
a resistance network arranged on an inner surface of the substrate and to which a contact structure is assigned, an electrical connection of the contact structure to the resistance network producing an electrical signal indicating a filling level as a function of the pivoted position of a lever arm; and
at least one permanent magnet arranged on the clip and has the purpose of activating the contact structure,
wherein an electrical contact is electrically connected to the clip such that as the lever arm pivots on the substrate said contact describes a circular path corresponding to and electrically connected to the electrically conductive contact face, the electrically conductive contact face is electrically conductively connected to a connecting line of the filling level sensor to discharge an electrostatic charge.
2. The filling level sensor as claimed in claim 1 , wherein the radius of the circular path of the electrical contact is smaller than the radius of the circular path of the permanent magnet.
3. The filling level sensor as claimed in claim 2 , wherein the electrically conductive polyoxymethylene contains metal powder.
4. The filling level sensor as claimed in claim 1 , wherein the electrical contact is the permanent magnet.
5. The filling level sensor as claimed in claim 4 , wherein at least parts of the surface of the permanent magnet are metallic.
6. The filling level sensor as claimed in claim 1 , wherein the conductive plastic is electrically conductive polyoxymethylene.
7. The filling level sensor as claimed in claim 6 , wherein the electrically conductive polyoxymethylene contains graphite.