Abstract: The present disclosure concerns a membrane for a sensor, such as an opto-chemical or electrochemical sensor, including a polymer layer, for example, one featuring pores or openings, that is permeable to a measuring fluid and/or an analyte contained in the measuring fluid, with a surface designed to be in contact with a measuring fluid, wherein the surface is designed such that, at least in a moist condition of the polymer layer obtained by moistening the surface, a contact angle of a water drop applied to the surface is less than 50°, including less than 30°, and including less than 10°.

Abstract: An arrangement for optical measurement of at least one process variable in a medium, comprising: at least one light source; at least one light receiver; an optical sensor element at least one data processing unit; and a light conductor. The light conductor connects the light source with the optical sensor element and the optical sensor element with the light receiver. The light conductor is embodied with at least three arms, wherein the first arm is arranged at the light source, the second arm is arranged at the light receiver and the third arm is arranged at the optical sensor element first arm and the second arm combine to form the third arm. The invention relates further to a measuring device comprising an above described arrangement.

Abstract: A measuring membrane for an optochemical or amperometric sensor for determining or monitoring an analyte located in a medium, comprising a substrate material and a sensor element, which has at least one functional layer with a sensor-specific substance. The sensor element is embedded completely in a matrix, and the matrix is composed of a material, which at least in a portion facing the medium and adjoining the sensor element is permeable for the analyte.

Abstract: An arrangement for optical measurement of at least one process variable in a medium, comprising: at least one light source; at least one light receiver; an optical sensor element at least one data processing unit; and a light conductor. The light conductor connects the light source with the optical sensor element and the optical sensor element with the light receiver. The light conductor is embodied with at least three arms, wherein the first arm is arranged at the light source, the second arm is arranged at the light receiver and the third arm is arranged at the optical sensor element first arm and the second arm combine to form the third arm. The invention relates further to a measuring device comprising an above described arrangement.