preferably bonded by melting and or welding this bond is preferably produced using a suitable forming tool during the manufacture of the housing particularly through plastic injection molding compression or casting so that electrodes 3 4 and electrical conductors 5 6 are enveloped by the plastic of the impermeable housing and the plastics are melted into and or welded onto one another in the boundary surfaces of the electrode and of the housing exposed surfaces 7 8 of both electrodes 3 4 lie in an annular axial end surface 10 of the device and or of the valve seat and according to the present invention are positioned next to one another around the circumference at a predetermined interval exposed surfaces 7 8 may advantageously be processed jointly with the processing of annular surface 10 annular surface 10 comes into contact with the fluid and or medium to be sensed and therefore both exposed surfaces 7 8 as well and as a consequence of this an electrical current may flow between the two electrodes in accordance with the properties of the fluid or medium so that an electrical signal may be picked up at exposed ends 11 12 of the electrical conductors which extend out of the housing the bond of the electrodes to the surrounding housing region is preferably implemented as pressure tight in such a way that pressure differentials between an inner space of a device particularly a valve associated with surfaces 7 8 and an outer space containing exposed ends 11 12 do not lead to leaks electrical.