ARRANGEMENT FOR CONTINUOUS DETERMINATION OF A SUBSTANCE

A modular sensing device for the continuous determination of a substance comprises a chemically reacting sensor element (21) arranged in or adjacent to a limiting wall of a volume (22) containing the substance. A glass body (24) is arranged adjacent to the coupling for direct contact with the sensor element and separate conduits (31, 34) for the illuminating and for the scattered light are arranged rearward of the glass body. A modular sensing device for the continuous determination of a substance comprises a chemically reacting sensor element arranged in or adjacent to a limiting wall of a volume containing the substance. In a housing (2) of the modular device (1), optical elements to read the sensor element are arranged, comprising at least one light source (35) illuminating the sensor element and at least one sample detector (29) detecting the light scattered by the sensor element. A front side of the housing comprises a coupling for the sensor element, so that the sensor element may be interchangeably and modularly coupled to the front side of the housing. A glass body is arranged adjacent to the coupling for direct contact with the sensor element, and separate conduits for the illuminating and for the scattered light are arranged rearward of the glass body.