Electrochemical measuring cell for measuring the content of chlorine compounds in water

Abstract

The invention relates to an electrochemical measuring cell for measuring the content of chlorine compounds in water, having an electrolyte chamber (2) which receives an electrolyte, a measuring electrode (3) which delimits the electrolyte chamber, a reference electrode (5), and a counterelectrode (4). Said electrochemical measuring cell is characterised in that the measuring electrode (3) is a rigid, porous platinum membrane having a pore size of 0.15 μm to 0.25 μm, which produces the contact with the electrolyte and the water.

Claims

1. An electrochemical measuring cell for measuring the content of chlorine compounds in water, the electrochemical measuring cell comprising: an electrolyte chamber comprising an electrolyte arranged in an interior of the electrolyte chamber; a measuring electrode delimiting the electrolyte chamber; a reference electrode arranged in the electrolyte in the interior of the electrolyte chamber; a counter electrode arranged outside of the electrolyte chamber; wherein the measuring electrode is a rigid membrane consisting of porous platinum having a pore size of 0.15 μm to 0.25 μm, wherein the rigid membrane consisting of porous platinum has a thickness of 0.5 mm+/−0.05 mm, wherein the rigid membrane consisting of porous platinum comprises a first face facing the electrolyte and exposed to the electrolyte and further comprises a second face opposite to the first face, wherein the second face faces away from the electrolyte and is exposed to the water to be tested, wherein within the rigid membrane consisting of porous platinum a physical and an electrical contact between the water to be tested and the electrolyte is taking place.

2. The electrochemical measuring cell according to claim 1, wherein the pore size amounts to 0.2 μm.

3. The electrochemical measuring cell according to claim 1, wherein the counter electrode contains platinum.

4. The electrochemical measuring cell according to claim 1, wherein the counter electrode is a platinum ring surrounding the electrolyte chamber.

Description

BRIEF DESCRIPTION OF THE DRAWING

(1) FIG. 1 shows a measuring cell according to the invention.

DESCRIPTION OF PREFERRED EMBODIMENT

(2) The measuring cell is comprised according to the drawing of a 12 mm glass housing 1 having attached at its bottom end the measuring electrode 3 in the form of a rigid microporous platinum membrane with a pore size of 0.15 μm to 0.25 μm, preferably 0.2 μm. In the interior of the housing 1, there is the reference electrode 5 and the electrolyte chamber 2. In the shaft-like housing 1, a platinum ring as a counter electrode 4 is attached. At the top end of the housing, there is a connecting head 6 for connecting to a measured value evaluation unit.

(3) The porous platinum membrane of the measuring electrode 3 leads to an intimate contact between the electrolyte and the substance to be measured in the pores of the platinum membrane 3. The resulting product is detected at the measuring electrode 3 and reduced in this context. This leads to a current flow that is proportional to the concentration of the substance to be measured.