Pressure-resistant reference electrode for electrochemical measurements
View Patent ↗A pressure-resistant reference electrode for electrochemical measurements includes both a half cell and a primary current bridge, provided for closing an electrochemical contact between the half cell and a measurement medium, which current bridge contains a primary electrolyte. The half cell has a reference electrolyte and a lead-off element, dipped into the reference electrolyte, which are disposed in a half-cell chamber that is provided with a primary junction leading to the primary current bridge and is otherwise embodied as medium-proof. The half-cell chamber furthermore has a flexible wall region, which is embodied such that a pressure difference between the primary current bridge and the half cell can be compensated for essentially without convection by the primary junction.
1. A pressure-resistant reference electrode for electrochemical measurements, comprising:
a half cell;
a primary current bridge for closing an electrochemical contact between the half cell and a measurement medium, which current bridge contains a primary electrolyte, wherein the half cell has both a reference electrolyte and a lead-off element, dipped into the reference electrolyte, which are disposed in a half-cell chamber that is provided with a primary junction leading to the primary current bridge and is otherwise embodied as medium-proof, the half-cell chamber having a flexible wall region which is embodied such that a pressure difference between the primary current bridge and the half cell can be compensated for essentially without convection through the primary junction; and
two wall parts, spaced apart essentially in plane-parallel fashion, which are disposed on a framelike spacer located between them, at least one of the wall parts being formed by a film that forms the flexible wall region, the spacer being divided by a middle rib into a half-cell region and a current bridge region, and the primary junction being formed by a recess in the middle rib that is equipped with a convection- inhibiting filling.
2. A pressure-resistant reference electrode for electrochemical measurements, comprising:
a half cell;
a primary current bridge for closing an electrochemical contact between the half cell and a measurement medium, which current bridge contains a primary electrolyte. wherein the half cell has both a reference electrolyte and a lead-off element, dipped into the reference electrolyte, which are disposed in a half-cell chamber that is provided with a primary junction leading to the primary current bridge and is otherwise embodied as medium-proof, the half-cell chamber having a flexible wall region which is embodied such that a pressure difference between the primary current bridge and the half cell can be compensated for essentially without convection through the primary junction; and
a plurality of stacked components, of which an outer component forms the flexible wall region of the half-cell chamber.
3. The reference electrode of claim 2 , wherein the lead-off element is embodied as a conductor track.
4. The reference electrode of claim 2 , wherein the half-cell chamber and/or the primary current bridge is embodied in meandering form, in order to lengthen a diffusion path between the measurement medium and the half cell.
5. The reference electrode of claim 2 , wherein an electrolyte located in the electrode is in gel form.
6. The reference electrode of claim 2 , wherein the flexible wall regions is formed by a film.
7. A pressure-resistant reference electrode for electrochemical measurements comprising:
a half cell
a primary current bridge for closing an electrochemical contact between the half cell and a measurement medium, which current bridge contains a primary electrolyte, wherein the half cell has both a reference electrolyte and a lead-off element, dipped into the reference electrolyte, which are disposed in a half-cell chamber that is provided with a primary junction leading to the primary current bridge and is otherwise embodied as medium-proof, the half-cell chamber having a flexible wall region which is embodied such that a pressure difference between the primary current bridge and the half cell can be compensated for essentially without convection through the primary junction; and
wherein the primary junction is embodied as a compacted junction.
8. The reference electrode of claim 7 , wherein the half-cell chamber is disposed inside the primary current bridge.
9. The reference electrode of claim 8 , wherein the primary junction is formed by a diaphragm lined with a hydrophyllic layer.
10. The reference electrode of claim 8 , wherein the primary junction is formed by an ion conducting polymer stopper or a semipermeable membrane.
11. The reference electrode of claim 7 , wherein the primary junction is formed by a diaphragm lined with a hydrophillic layer.
12. The reference electrode of claim 10 , wherein nonporus the diaphragm forms the flexible wall region.
13. The reference electrode of claim 11 , wherein the half-cell chamber contains a secondary current bridge, disposed between the half cell and the primary junction, in which a secondary electrolyte is located and between the half cell and the secondary current bridge, a secondary junction is provided.
14. The reference electrode of claim 12 , wherein the flexible wall region is disposed at the secondary current bridge.
15. The reference of claim 13 , wherein the flexible wall region is formed by a hose.
16. The reference electrode of claim 7 , wherein the half-cell chamber contains a secondary current bridge, disposed between the half cell and the primary junction, in which a secondary electrolyte is located, and between the half cell and the secondary current bridge, a secondary junction is provided.
17. The reference electrode of claim 7 , wherein the flexible wall region is formed by a hose.
18. The reference electrode of claim 16 , wherein the hose material of the flexible wall region has a maximum hardness of 70 (Shore A).
19. The reference electrode of claim 7 , wherein an electrolyte located in the electrode is in gel form.
20. The reference electrode of claim 7 , wherein the primary junction is formed by an ion conducting polymer stopper or a semipermeable membrane.
21. The reference electrode of claim 20 , wherein the ion conducting polymer stopper or the semipermeable membrane forms the flexible wall region.
22. A pressure-resistant reference electrode for electrochemical measurements, comprising:
a half cell; and
a primary current bridge for closing an electrochemical contact between the half cell and a measurement medium, which current bridge contains a primary electrolyte, wherein the half cell has both a reference electrolyte and a lead-off element which are disposed in a half-cell chamber, the half-cell chamber having a primary junction leading to the primary current bridge, the half-cell chamber having a flexible wall region which is configured to compensate a pressure difference between the primary current bridge and the half cell, wherein the primary junction is embodied as a compacted junction.