US5007283A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and device for processing measured values
Assignee: Endress and Hauser Conducta GmbH and Co KG
•
Filing: 1989-05-31
•
Granted: 1991-04-16
•
Expires: 2009-05-31
Abstract
Abstract In connection with a method and a device for processing measured values, where resistance variations are evaluated as a measure for the variation of the gas concentration to be measured, it is proposed to measure a basic resistance value at least once, preferably repeatedly, by admitting a standard calibration gas, and to store this resistance value and derive therefrom, for each subsequent measurement of the gas component the concentration of which is to be measured, by an arithmetic operation, the ratio between the resulting total resistance value and the momentary basic resistance value, and to evaluate the ratio so obtained for further processing.
Inventors
- 👤 Stefan Ambos
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 13:04
CPC Classifications
G; G01; G01N; G01N33/00; G01N33/0004; G01N33/0006
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
112 words
A method for processing measured values in a gas detection device evaluating a resistance variation of a gas sensor forming part of said device for a range of gas concentrations to be measured, comprising the steps of determining and storing at least once a basic resistance value (Ro) of said, without the influence of the gas to be measured, and determining for every subsequent measurement of the gas component, the concentration of which is to be measured, the ratio between a resulting total resistance value (Rs) of said gas sensor dependent on gas concentration and the basic resistance value (Ro), by an arithmetic operation, and using thereafter the value (Rs/Ro) so obtained.
Claim 2
Independent Claim
112 words
A method for processing measured values in a gas detection device evaluating a resistance variation of a gas sensor forming part of said device for a range of gas concentrations to be measured, comprising the steps of determining and storing at least once a basic resistance value (Ro) of said, without the influence of the gas to be measured, and determining for every subsequent measurement of the gas component, the concentration of which is to be measured, the ratio between a resulting total resistance value (Rs) of said gas sensor dependent on gas concentration and the basic resistance value (Ro), by an arithmetic operation, and using thereafter the value (Rs/Ro) so obtained.
Claim 3
Dependent Claim
36 words
A method according to claim 1, wherein the basic resistance value (Ro) is repeatedly measured at predetermined time intervals and stored as a new basic resistance value (Ro) which is then used for deriving said ratio.
Claim 4
Dependent Claim
47 words
A method according to claim 2, wherein a standard calibration gas is used for effecting said repeated measurement and subsequent storage of the new basic resistance value (Ro) and the total resistance values (Rs) determined thereafter are related to the new basic resistance value (Ro) so determined.
Claim 5
Dependent Claim
16 words
A method according to claim 3, wherein said calibration gas is 3,000 ppm CH 4 .
Claim 6
Independent Claim
90 words
A device for processing measured values in a gas detection device evaluating resistance variations for a gas concentration to be measured, comprising a storage in which a basic resistance value (Ro) of a sensor having a resistance that varies with gas concentration, is stored before measuring the total resistance value Rs of the sensor and circuit means for deriving the ratio between every new measured total resistance value (Rs) of the sensor and the basic resistance value (Ro) stored at any time, and for outputting this ratio for further processing.
Claim 7
Independent Claim
90 words
A device for processing measured values in a gas detection device evaluating resistance variations for a gas concentration to be measured, comprising a storage in which a basic resistance value (Ro) of a sensor having a resistance that varies with gas concentration, is stored before measuring the total resistance value Rs of the sensor and circuit means for deriving the ratio between every new measured total resistance value (Rs) of the sensor and the basic resistance value (Ro) stored at any time, and for outputting this ratio for further processing.
Claim 8
Dependent Claim
13 words
A device as in claim 4, wherein said sensor is a semiconductor sensor.
References Cited (Backward Citations)
US3429178A
Cited
US3418914A
Cited
US3864628A
Cited
US4147513A
Cited
US4151738A
Cited
US4156181A
Cited
US4326414A
Cited
US4223549A
Cited
US4321113A
Cited
DE3036106A1
Cited
JPS57163862A
Cited
DE3140875A1
Cited
JPS6027849A
Cited
SU1191858A1
Cited
US4627269A
Cited
US4663958A
Cited
JPS61256249A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-04-15 | 1994-10-15 | 1995-04-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-04-15 | 1998-10-15 | 1999-04-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-04-15 | 2002-10-15 | 2003-04-16 | $7700.00 | Window Closed / Lapsed |