Probe and arrangement for determining the moisture content or conductivity of a material
View Patent ↗In a probe and an arrangement including a probe for determining a moisture content or a conductivity of a material, wherein the probe has a base body with two electrical conductors of which at least one has the form of a tape which is embedded in an electrically insulating material area of the base body in such a way that only an edge area of the tape-like conductor is disposed at the surface of the insulating material area of the base body for contact with the material.
1. A probe for determining a moisture content or conductivity of a material comprising:
a base body ( 1 a , 1 b , 1 b ′, 1 b ″, 1 b ′″) including at least two electrical conductors ( 3 , 4 , 3 ′, 3 ″, 4 ″, 3 ′″, 4 ′″) of which at least one ( 3 , 3 ′, 3 ″, 3 ′″) is tape-like formed,
said base body ( 1 a , 1 b , 1 b ″, 1 b ′″) including an electrically insulating area ( 2 a , 2 b ; 2 a ″, 2 b ″, 2 a ′″, 2 b ′″) in which the at least one tape-like electrical conductor is disposed so that, in its transverse direction, it extends from the surface of the base body ( 1 a , 1 b , 1 b ″, 1 b ′″) into the electrically insulating area ( 2 b ; 2 a ″, 2 b ″, 2 a ′″, 2 b ′″), whereby only a side edge surface of the tape like electrical conductor is exposed at the surface of the base body for contact with the medium.
2. The probe according to claim 1 , wherein the at least one tape-like conductor ( 3 , 3 ′, 3 ″, 3 ′″) is disposed between two elements ( 2 a , 2 b ; 2 a ″, 2 a ′″, 2 b ′″) consisting of an electrically insulating material.
3. The probe according to claim 2 , wherein the electrically insulating elements ( 2 a , 2 b , 2 a ″, 2 b ″, 2 a ′″, 2 b ′″) consist of a ceramic material.
4. The probe according to claim 1 , wherein the base body ( 1 a , 1 b ) includes an electrically conductive frame ( 1 b ) in which the electrically insulating area ( 2 a , 2 b ) is arranged.
5. The probe according to claim 4 , wherein the frame ( 1 b ) consists of tool steel having a Rockwell hardness of at least HRC-50.
6. The probe according to claim 1 , wherein the at least one tape-like conductor ( 3 ′) is configured so as to be comb-shaped including parallel teeth extending to the surface of the base body for contact with the medium.
7. The probe according to claim 6 , wherein the comb-shaped conductor ( 3 ′) has teeth ( 3 a ′) which extend from the tape-like conductor at an angle (α) of less than 90° with respect to the longitudinal direction of the conductor ( 3 ′).
8. The probe according to claim 7 , wherein the angle (α) is so selected that—seen in a transverse direction of the conductor ( 3 ′)—the teeth ( 3 a ′) do not overlap.
9. The probe according to claim 1 , wherein the base body ( 1 b ″) is parallelepiped in its shape and is provided at its side opposite the electrically insulating area ( 2 a ″, 2 b ″) with a window in which a cover element ( 6 ″) consisting of an electrically insulating material arranged.
10. The probe according to claim 1 , wherein the base body ( 1 b ″) consists of a cylinder with a flattened side on which the electrically insulating area ( 2 a ′″, 2 b ′″) is arranged.
11. An arrangement for determining moisture or conductivity of a medium, including a probe comprising:
a base body ( 1 a , 1 b , 1 b ′, 1 b ″, 1 b ′″) and, associated with the base body, at least two electrical conductors ( 3 , 4 , 3 ′, 3 ″, 4 ″, 3 ′″, 4 ′″) of which at least one ( 3 , 3 ′, 3 ″, 3 ′″) is tape-like formed, the base body having an electrically insulated material area ( 2 a , 2 b ; 2 a ″, 2 b ″, 2 a ′″, 2 b ′″) in which the at least one tape-like electrical conductor is disposed; so that, in its transverse direction it extends from the surface of the base body ( 1 a , 1 b , 1 b ″, 1 b ′″) into the interior thereof and is embedded in the electrically insulated material area to the extent that only a side edge surface of the tape-like electrical conductor ( 3 , 3 ′, 3 ″, 3 ′″) is exposed at the surface of the base body for contact with the medium.