US5611908A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of operating and amperometric measuring cell
Assignee: Draegerwerk AG and Co KGaA
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Filing: 1995-12-21
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Granted: 1997-03-18
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Expires: 2015-12-21
Abstract
Abstract The invention relates to a method for operating an amperometric measuring cell which includes at least a measuring electrode 2 and a counter electrode 3 in an electrolyte chamber 4 filled with an electrolyte. The measuring cell is closed off by a permeable membrane 7 with respect to the measurement sample to be detected. The method of the invention improves the run-in performance of the measuring cell 1. The method includes the step of applying a voltage U 1 across the electrodes (2, 3) during a first time span T 1 starting at a reference time T 0 . A reference voltage U 0 is assumed at the start of the measurement and the voltage U 1 is increased relative to the reference voltage U 0 .
Inventors
- 👤 Hans Matthiessen
- 👤 Matthias Studer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 21:18
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/26; G01N27/416; G01N27/4163; G01N27/49
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
178 words
A method of operating an amperometric measuring cell for measuring a sample, the measuring cell including: an electrolyte chamber having an opening directed toward the sample to be measured and holding an electrolyte; a permeable membrane mounted on said chamber for closing off said chamber; and, a measuring electrode and a counter electrode disposed in said chamber so as to be in spaced relationship to each other; and, the method comprising the steps of: providing a voltage source outputting a voltage U for applying said voltage U across said electrodes to generate a sensor current i(t) between said electrodes; and, starting with said voltage U across said electrodes at a reference voltage U 0 at a reference time T O and applying a voltage U 1 during a first time span T 1 measured from said reference time T O with said voltage U 1 being increased relative to said reference voltage U 0 , wherein the sensor current i(t) adjusts more rapidly to a sensor rest current i 0 to shorten the run time of the cell.
Claim 2
Independent Claim
178 words
A method of operating an amperometric measuring cell for measuring a sample, the measuring cell including: an electrolyte chamber having an opening directed toward the sample to be measured and holding an electrolyte; a permeable membrane mounted on said chamber for closing off said chamber; and, a measuring electrode and a counter electrode disposed in said chamber so as to be in spaced relationship to each other; and, the method comprising the steps of: providing a voltage source outputting a voltage U for applying said voltage U across said electrodes to generate a sensor current i(t) between said electrodes; and, starting with said voltage U across said electrodes at a reference voltage U 0 at a reference time T O and applying a voltage U 1 during a first time span T 1 measured from said reference time T O with said voltage U 1 being increased relative to said reference voltage U 0 , wherein the sensor current i(t) adjusts more rapidly to a sensor rest current i 0 to shorten the run time of the cell.
Claim 3
Dependent Claim
83 words
The method of claim 1, further comprising the step of applying a second voltage U 2 across said electrodes during a second time span T 2 directly after said first time span T 1 with said second voltage U 2 being dropped relative to said reference voltage U 0 ; and, selecting said first and second time spans (T 1 , T 2 ) so that said second time span T 2 is not greater than said first time span T 1 .
Claim 4
Dependent Claim
67 words
The method of claim 2, wherein said voltages (U 1 and U 2 ) and said time spans (T 1 and T 2 ) are so selected that the product of the difference (U 1 -U 0 ) and T 1 divided by the product of the difference (U 2 -U 0 ) and T 2 is equal to or greater than 5 as follows: ##EQU3## .
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2000-03-17 | 2000-09-16 | 2001-03-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-03-17 | 2004-09-16 | 2005-03-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-03-17 | 2008-09-16 | 2009-03-18 | $7700.00 | Window Closed / Lapsed |