A device for sensing a parameter related to an electrical phenomenon and able to be translated into an electrical signal, such as in a biopharmaceutical content located in the space of a biopharmaceutical container delimited by a wall having an opening, the content being able to be subject to agitation, the sensing device having an axis, a proximal side towards the container and a distal side opposite to the container, comprising: support and fixing means of a wall type, rigid, able to support the members constituting the sensing device and to be fixed rigidly and sealingly to the wall at the periphery of the opening, comprising a support and fixing wall and a set of chamber walls, delimiting a chamber for the content, having a closed part that includes an open part able to provide passage of the content between the chamber and the internal space of the container external to the chamber, said set of walls comprising an external chamber end wall, closed, disposed transversely, able to come in line with the opening and at least one peripheral chamber wall, extending from its distal end part in an axial direction towards the proximal side from the periphery of the external end wall, and means of capturing the parameter, rigidly fixed to the support and fixing means, comprising a capture face located in the chamber, able to be in electrical contact with the content, and electrical connection means electrically connected to the sensing means, rigidly fixed to the support and fixing means, able to be accessible from the outside of the container when the sensing device is fixed to it and to be electrically connected to electrical connection means located outside the container, the set of walls comprising an internal chamber end wall forming a rigid whole, solid, that is to say closed, disposed at least in part generally transversely in line with the external end wall from the proximal axial end part of the peripheral wall, the open part being provided in the peripheral wall, the chamber being a holding chamber able to provide confinement of the content located therein, the chamber being isolated from the internal space and preserved from the agitation prevailing therein by the internal chamber end wall, solid, that is to say closed, so as to minimise the impact of said agitation on the measurement of the parameter of the content by the capture face. support and fixing means of a wall type, rigid, able to support the members constituting the sensing device and to be fixed rigidly and sealingly to the wall at the periphery of the opening, comprising a support and fixing wall and a set of chamber walls, delimiting a chamber for the content, having a closed part that includes an open part able to provide passage of the content between the chamber and the internal space of the container external to the chamber, said set of walls comprising an external chamber end wall, closed, disposed transversely, able to come in line with the opening and at least one peripheral chamber wall, extending from its distal end part in an axial direction towards the proximal side from the periphery of the external end wall, and means of capturing the parameter, rigidly fixed to the support and fixing means, comprising a capture face located in the chamber, able to be in electrical contact with the content, and electrical connection means electrically connected to the sensing means, rigidly fixed to the support and fixing means, able to be accessible from the outside of the container when the sensing device is fixed to it and to be electrically connected to electrical connection means located outside the container, the set of walls comprising an internal chamber end wall forming a rigid whole, solid, that is to say closed, disposed at least in part generally transversely in line with the external end wall from the proximal axial end part of the peripheral wall, the open part being provided in the peripheral wall, the chamber being a holding chamber able to provide confinement of the content located therein, the chamber being isolated from the internal space and preserved from the agitation prevailing therein by the internal chamber end wall, solid, that is to say closed, so as to minimise the impact of said agitation on the measurement of the parameter of the content by the capture face.