US 12,239,974 B2
Measuring arrangement for measuring the total nitrogen bound in a measuring liquid
Ulrich Rottensteiner, Stuttgart (DE); Christian Cramer, Stuttgart (DE); Eva-Maria Petat, Stuttgart (DE); Thomas Baumgartner, Stuttgart (DE); Thomas Schipolowski, Stuttgart (DE); and Ralf Bernhard, Stuttgart (DE)
Assigned to Endress+Hauser Conducta GmbH+Co. KG, Gerlingen (DE)
Filed by Endress+Hauser Conducta GmbH+Co. KG, Gerlingen (DE)
Filed on Aug. 19, 2020, as Appl. No. 16/997,137.
Claims priority of application No. 10 2019 122 163.3 (DE), filed on Aug. 19, 2019.
Prior Publication US 2021/0053047 A1, Feb. 25, 2021
Int. Cl. B01L 3/00 (2006.01); G01N 21/33 (2006.01)
CPC B01L 3/502 (2013.01) [G01N 21/33 (2013.01); B01L 2200/10 (2013.01); B01L 2300/0627 (2013.01); B01L 2300/0858 (2013.01); B01L 2300/18 (2013.01); B01L 2300/1883 (2013.01); B01L 2300/1894 (2013.01)] 11 Claims
OG exemplary drawing
 
1. A measuring arrangement for measuring a total nitrogen bound in a measuring liquid, comprising:
a radiation source designed to emit at least measuring radiation of a wavelength or wavelength range in an ultraviolet wavelength range;
a radiation receiver configured to generate a signal that depends on an intensity of measuring radiation impinging on the radiation receiver;
a vessel having a vessel wall that encloses an interior space and is embodied of a first material, the vessel wall having a first opening closed by a first window and further having a second opening opposite the first opening and closed by a second window, wherein the first and second windows are embodied of a second material and are transparent to the measuring radiation;
a heating element in thermal contact with the vessel wall;
a plurality of cooling elements attached on an outer side of the vessel and in thermal contact with the vessel wall;
a thermally insulating hood embodied to surround the vessel and the attached cooling elements such that a channel for air passage is formed between the vessel and the hood, wherein the channel begins at an inlet opening between the hood and the vessel at a first side of the vessel, follows a U-shaped path up along the first side of the vessel, along a top side of the vessel, and down along a second side of the vessel, and ends at an outlet opening between the hood and the vessel at the second side of the vessel; and
a ventilation system including at least one fan arranged at the inlet opening of the channel and configured to transport air into the channel such that the air flows through the U-shaped path of the channel and across the cooling elements, wherein the air exits the channel at the outlet opening of the channel,
wherein the radiation source and the radiation receiver are arranged with respect to the vessel such that at least a portion of the measuring radiation emitted by the radiation source propagates along a measuring path extending from the radiation source through the first window, the vessel, and the second window to the radiation receiver.