US4618268A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for sensing average temperature
Assignee: Individual
•
Filing: 1985-01-09
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Granted: 1986-10-21
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Expires: 2005-01-09
Abstract
Abstract A device and method for detecting average temperature, particularly adapted for determining the average liquid temperature in an underground horizontally disposed cylindrical tank. The sensing element, in the form of a wire of known temperature versus electrical resistance characteristic is contained within an extensible cylindrical helical coil of plastic tubing which can be introduced into the tank and extended to the overall height of the liquid by gravity through a weight on one end of the coil or by the use of an extendible rod inserted into the center of the coil. The tubing is preformed or arranged relative to the extensible rod to present a greater number of coil turns at the center of the tank to compensate for greater liquid volume.
Inventors
- 👤 John A. Horner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 04:02
CPC Classifications
G; G01; G01K; G01K13/00; G01K13/10
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
119 words
A temperature averaging sensor for measuring the average temperature of a fluid confined within a tank having a nonuniform depth-volume profile comprising, in combination: a length of wire with a known electrical resistance versus temperature characteristic; an extensible cylindrical, multi-turn helical coil of plastic tubing in which said length of wire is contained; means for extending said coil to a predetermined length corresponding to the depth of fluid within said tank and means for arranging the spacing between coil turns so that the density of coil turns is commensurate with the depth-volume profile of the liquid in said tank; and an electrical connector connected to each end of said wire and adapted to be connected to a measuring circuit.
Claim 2
Dependent Claim
119 words
A temperature averaging sensor for measuring the average temperature of a fluid confined within a tank having a nonuniform depth-volume profile comprising, in combination: a length of wire with a known electrical resistance versus temperature characteristic; an extensible cylindrical, multi-turn helical coil of plastic tubing in which said length of wire is contained; means for extending said coil to a predetermined length corresponding to the depth of fluid within said tank and means for arranging the spacing between coil turns so that the density of coil turns is commensurate with the depth-volume profile of the liquid in said tank; and an electrical connector connected to each end of said wire and adapted to be connected to a measuring circuit.
Claim 3
Dependent Claim
18 words
The temperature averaging sensor of claim 1 wherein said length of wire is platinum of a uniform diameter.
Claim 4
Dependent Claim
27 words
The temperature averaging sensor of claim 1 and further comprising an electrical insulation covering said wire, said insulated wire being inserted in said extensible coil of tubing.
Claim 5
Dependent Claim
30 words
The temperature averaging sensor of claim 1 in which said electrical connector sealingly engages one end of said extensible coil and the other end of said extensible coil is closed.
Claim 6
Dependent Claim
36 words
The temperature averaging sensor of claim 4 wherein said length of wire extends from closely adjacent said connector to said closed end of said extensible coil and back to a point closely adjacent to said connector.
Claim 7
Dependent Claim
49 words
The temperature averaging sensor of claim 5 wherein one end of said sensing wire is connected to said connector by a single lead wire and the other end of said length of sensing wire is connected by two lead wires to said connector, thereby forming a three wire system.
Claim 8
Dependent Claim
69 words
The temperature averaging sensor of claim 4 wherein said coil is preformed with relative spacing between coil turns to match the density of coil turns with the depth-volume profile of the liquid in said tank, said means for extending said coil includes a weight connected to the closed end of said extensible coil, whereby said coil is extended to said predetermined length and arranged in a volume-temperature averaging relationship.
Claim 9
Dependent Claim
70 words
The temperature averaging sensor of claim 4 wherein said means for extending said coil to a predetermined length includes an extensible rod passing through the center of said extensible coil, the rod being attached at its end to the closed end of said extensible coil and the means for arranging said coil with a matching coil turn density includes a plurality of clips mounting said coil turns to said rod.
Claim 10
Dependent Claim
29 words
The temperature averaging sensor of claim 7 wherein said extensible cylindrical helical coil of plastic tubing is preformed with a greater number of coil turns at its longitudinal center.
Claim 11
Dependent Claim
33 words
The temperature averaging sensor of claim 9 wherein said extensible cylindrical helical coil of plastic tubing is further preformed with the spacing between successive coil turns increasing toward each end of said coil.
Claim 12
Independent Claim
122 words
The method of determining the average temperature of a liquid within a tank having a nonuniform depth-volume profile comprising the steps of: determining the level of the liquid in the tank; introducing an extensible helical coil of plastic tubing vertically into said tank, said tubing having a temperature responsive medium within it extending the length of said tubing, said medium having a known physical property versus temperature characteristic; arranging the relative spacing between coil turns so that the density of coil turns is commensurate with the depth-volume profile of the liquid in said tank; extending the length of said tubing coil to extend over the depth of the liquid being tested; sensing said physical property and reducing it to a temperature value.
Claim 13
Independent Claim
122 words
The method of determining the average temperature of a liquid within a tank having a nonuniform depth-volume profile comprising the steps of: determining the level of the liquid in the tank; introducing an extensible helical coil of plastic tubing vertically into said tank, said tubing having a temperature responsive medium within it extending the length of said tubing, said medium having a known physical property versus temperature characteristic; arranging the relative spacing between coil turns so that the density of coil turns is commensurate with the depth-volume profile of the liquid in said tank; extending the length of said tubing coil to extend over the depth of the liquid being tested; sensing said physical property and reducing it to a temperature value.
Claim 14
Dependent Claim
71 words
The method of determining the average temperature of a liquid in a tank according to claim 11 wherein the extensible helical coil of plastic tubing is preformed with said relative spacing between coil turns and is introduced into the tank with one end located at said determined level and the coil is allowed to extend downward in the tank by gravity to extend over the depth of the liquid being tested.
Claim 15
Dependent Claim
74 words
The method of determining the average temperature of a liquid in a tank according to claim 11 wherein the step of determining the level of the liquid in the tank is accomplished by filling the tank completely with said liquid and the step of extending and arranging the helical coil is extending it to the full height of said tank and arranging the coil turn density to match the depth-volume profile of said tank.
Claim 16
Dependent Claim
142 words
The method of determining the average temperature of a liquid in a cylindrical tank having a horizontally disposed axis according to claim 13 wherein the extensible helical coil which is introduced into said tank has been preformed so that a greater density of coil turns is located at its mid point and proportionately a lesser density of coil turns are located extending upwardly and dowardly from said mid point and wherein the step of extending and arranging the helical coil is accomplished by holding the upper end of the coil at the top of said tank and allowing it to extend downward by gravity to span the full height of said tank, the coil turns become arranged so that the magnitude of the physical property being measured compensates for the greater volume of liquid being located towards the center of the tank.
Claim 17
Dependent Claim
74 words
The method of determining the average temperature of a liquid in a tank according to claim 11 wherein an extendible rod is introduced into said tank with said extensible helical coil and is used to position said extensible helical coil to extend over the entire depth of the liquid being tested and said coil turns are arranged relative to said rod to match the coil turn density with said depth-volume profile of the liquid.
Claim 18
Dependent Claim
73 words
The method of determining the average temperature of a liquid in a cylindrical tank having a horizontally disposed axis according to claim 15 wherein the step of determining the level of the liquid in the tank is accomplished by filling the tank completely with said liquid and the coil is arranged relative to said rod with the number of coil turns being greater as the extended coil approaches the center of the tank.
References Cited (Backward Citations)
US23844A
Cited
USRE23844E
Cited
US2691889A
Cited
US2588014A
Cited
US2760373A
Cited
US2752543A
Cited
US3015954A
Cited
US3111846A
Cited
US3201990A
Cited
US3470744A
Cited
US3469447A
Cited
US3580055A
Cited
FR1601204A
Cited
US3653262A
Cited
US3864975A
Cited
JPS5770416A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-10-20 | 1990-04-21 | 1990-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-10-20 | 1994-04-21 | 1994-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-10-20 | 1998-04-21 | 1998-10-21 | $7700.00 | Window Closed / Lapsed |