Flow-through measuring cell

Abstract

A flow-through measuring cell having one inlet opening for entry of the fluid, and one outlet opening for exit of the fluid. A single measurement space is located between the inlet opening and outlet opening. A radiation measurement region is provided for measuring the interaction of the fluid in the measuring cell with electromagnetic radiation from outside the measuring cell. The radiation measurement region is bordered by two opposite windows of which one is intended for inlet and the other for exit of the electromagnetic radiation. The measuring cell has a positioning range with several operating positions with a different distance A, A′ between the windows into which the measuring cell can be set without rotation.

Having described the invention, the following is claimed: 
     
         1 . A flow-through measuring cell comprising:
 an inlet opening for entry of a fluid;   an outlet opening for exit of the fluid;   a measurement space located between the inlet opening and the outlet opening;   a radiation measurement region for measuring the interaction of the fluid in the measuring cell with electromagnetic radiation from outside the measuring cell, the radiation measurement region bordered by two opposite windows, a first of said windows for inlet of the electromagnetic radiation and a second of said windows for exit of the electromagnetic radiation, the measuring cell having a positioning range with a plurality of operating positions, each of said operating positions defining a different distance A, A′ between the windows into which the measuring cell can be set without rotation.   
     
     
         2 . The measuring cell as claimed in  claim 1 , wherein the measuring cell, after setting of a first operating position, is adjustable within the positioning range. 
     
     
         3 . The measuring cell as claimed in  claim 1 , wherein the measuring cell is formed at least in part from plastic and/or rubber. 
     
     
         4 . The measuring cell as claimed in  claim 1 , wherein the operating position can be set or adjusted along a fit of the window or a window receiver which accommodates the window in the measuring cell. 
     
     
         5 . The measuring cell as claimed in  claim 1 , wherein at least one of the windows can be adjusted or set to one another along their alignment along a guide channel corresponding to an outside contour of the window. 
     
     
         6 . The measuring cell as claimed in  claim 1 , wherein the positioning range extends from the smallest settable distance A, A′ at least by a factor of 1.5 of the smallest settable distance A, A′. 
     
     
         7 . The measuring cell as claimed in  claim 1 , wherein there is direct fitting of the windows relative to the respective guide channel of the measuring cell or of measuring cell body, said channel made as shaping of the measuring cell body. 
     
     
         8 . The measuring cell as claimed in  claim 2 , wherein the measuring cell is adjustable within the positioning range exclusively in the direction of the opposite window. 
     
     
         9 . The measuring cell as claimed in  claim 5 , wherein at least one of the windows is adjustable by frictional engagement in the guide channel.