GB1421227A - Test instrument and method of isolating and measuring the capacitance due to a particular functional group in a liquid - Google Patents
Test instrument and method of isolating and measuring the capacitance due to a particular functional group in a liquidInfo
- Publication number
- GB1421227A GB1421227A GB1971473A GB1971473A GB1421227A GB 1421227 A GB1421227 A GB 1421227A GB 1971473 A GB1971473 A GB 1971473A GB 1971473 A GB1971473 A GB 1971473A GB 1421227 A GB1421227 A GB 1421227A
- Authority
- GB
- United Kingdom
- Prior art keywords
- bridge
- electrodes
- oil
- capacitor
- sample
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 125000000524 functional group Chemical group 0.000 title 1
- 239000007788 liquid Substances 0.000 title 1
- 239000003990 capacitor Substances 0.000 abstract 7
- 239000003921 oil Substances 0.000 abstract 5
- 230000015556 catabolic process Effects 0.000 abstract 3
- 238000006731 degradation reaction Methods 0.000 abstract 3
- 230000003647 oxidation Effects 0.000 abstract 2
- 238000007254 oxidation reaction Methods 0.000 abstract 2
- 238000001816 cooling Methods 0.000 abstract 1
- 239000010687 lubricating oil Substances 0.000 abstract 1
- 238000000053 physical method Methods 0.000 abstract 1
- 239000000758 substrate Substances 0.000 abstract 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/26—Oils; Viscous liquids; Paints; Inks
- G01N33/28—Oils, i.e. hydrocarbon liquids
- G01N33/2805—Oils, i.e. hydrocarbon liquids investigating the resistance to heat or oxidation
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/26—Measuring inductance or capacitance; Measuring quality factor, e.g. by using the resonance method; Measuring loss factor; Measuring dielectric constants ; Measuring impedance or related variables
- G01R27/2605—Measuring capacitance
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
- G01N27/22—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating capacitance
- G01N27/226—Construction of measuring vessels; Electrodes therefor
Landscapes
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Medicinal Chemistry (AREA)
- Food Science & Technology (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- General Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
Abstract
1421227 Electro-physical measurements J D SKILDUM 25 April 1973 19714/73 Heading G1N The oxidation of lubricating oils is determined by measuring the skin capacitance of a sample of the oil in contact with a pair of capacitor electrodes lying in the same plane and separated by a uniform gap. A disc shaped insulating substrate 13 provided with electrodes 11, 12 in the form of a plurality of concentric ring portions inter-connected to form a continuous uniform gap 15. Ring shaped peak 19 of an electrically conductive cylindrical wall 17 holds about three drops of sample to be tested, dip 18 being provided to take any overflow and a heat sink 22 cooling the sample. The electrodes 11, 12 are connected via heat sink 22 and terminal into one arm of an H.F. A.C. bridge two of the other arms being constituted by two inductors and the fourth by a pair of parallel connected variable capacitors Fig.3 (not shown). The bridge may be phase sensitive or not, Fig.4 (not shown). In operation one of the variable capacitors which is calibrated in terms of percentage of oxidation is set to a minimum and with a good or non-oxidized oil sample in contact with the electrodes 11, 12 the other variable capacitor is then adjusted to balance the bridge. The good oil is then replaced by an oil of known degradation and the one variable capacitor is adjusted to balance the bridge and a scale associated with the capacitor adjusted to give the correct degradation and complete the calibration. An oil to be tested is placed in contact with the electrodes 11, 12 and the one capacitor adjusted to balance the bridge, the degradation being read off from the calibrated scale.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1971473A GB1421227A (en) | 1973-04-25 | 1973-04-25 | Test instrument and method of isolating and measuring the capacitance due to a particular functional group in a liquid |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1971473A GB1421227A (en) | 1973-04-25 | 1973-04-25 | Test instrument and method of isolating and measuring the capacitance due to a particular functional group in a liquid |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1421227A true GB1421227A (en) | 1976-01-14 |
Family
ID=10133999
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1971473A Expired GB1421227A (en) | 1973-04-25 | 1973-04-25 | Test instrument and method of isolating and measuring the capacitance due to a particular functional group in a liquid |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB1421227A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1391727A2 (en) * | 2002-08-22 | 2004-02-25 | Delphi Technologies, Inc. | Diesel engine lubricating oil contaminant sensor method |
| CN103675043A (en) * | 2013-12-06 | 2014-03-26 | 西安天厚电子技术有限责任公司 | Oil quality detection sensor |
-
1973
- 1973-04-25 GB GB1971473A patent/GB1421227A/en not_active Expired
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1391727A2 (en) * | 2002-08-22 | 2004-02-25 | Delphi Technologies, Inc. | Diesel engine lubricating oil contaminant sensor method |
| EP1391727A3 (en) * | 2002-08-22 | 2004-06-02 | Delphi Technologies, Inc. | Diesel engine lubricating oil contaminant sensor method |
| CN103675043A (en) * | 2013-12-06 | 2014-03-26 | 西安天厚电子技术有限责任公司 | Oil quality detection sensor |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| PCNP | Patent ceased through non-payment of renewal fee |