GB2203554A - An improved temperature monitoring device - Google Patents
An improved temperature monitoring device Download PDFInfo
- Publication number
- GB2203554A GB2203554A GB08808858A GB8808858A GB2203554A GB 2203554 A GB2203554 A GB 2203554A GB 08808858 A GB08808858 A GB 08808858A GB 8808858 A GB8808858 A GB 8808858A GB 2203554 A GB2203554 A GB 2203554A
- Authority
- GB
- United Kingdom
- Prior art keywords
- monitoring device
- bore
- temperature monitoring
- conductors
- resistance temperature
- 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.)
- Withdrawn
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
- G01K7/16—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements
- G01K7/18—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements the element being a linear resistance, e.g. platinum resistance thermometer
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
- G01K7/16—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measuring Temperature Or Quantity Of Heat (AREA)
Abstract
A temperature monitoring device suitable for use in detecting the faulty operation of the exhaust gas recirculation system of an internal combustion engine comprises a metal body 1 having a bore 2 closed at one end and a resistance temperature detector 3 which is housed at the closed end of the bore. The detector 3 has a sleeve or body 4 which is made of thermally insulating e.g. ceramic material and has protruding lead wires 5 which are electrically connected by separate conductors 6, 7 to electric cable conductors 11 which are sealed at 12 in the open end of the bore. The electric connections between the protruding lead wires 5 and the cable conductors 11 are surrounded by a (ceramic) sleeve 14 of thermally insulating material. Any space within the bore 2 is filled with compacted mineral insulating material 15. The body has an external thread 17 and a part 18 of nut form to facilitate fixing in a tapped hole. <IMAGE>
Description
AN IMPROVED TEMPERATURE MONITORING DEVICE
This invention relates to a temperature monitoring device comprising a resistance temperature detector and, electrically connected to the detector, an electric cable.
In the temperature monitoring device of the kind with which the present invention is concerned, the resistance temperature detector comprises a detector element housed in a sleeve of or supported on or surrounded by a body of electrically insulating material and electrically connected to lead wires which protrude from one end of the detector, and the electric cable comprises at least two elongate conductors electrically insulated the one from the other, the conductors of the cable being electrically connected to the protruding lead wires of the resistance temperature detector. A temperature monitoring device of the aforesaid kind will, for convenience, hereinafter be referred to as "of the kind described".
It is an object of the present invention to provide an improved temperature monitoring device of the kind describes which is especially, but not exclusively, suitable for use in detecting the faulty operation of the exhaust gas recirculation system of the internal combustion engine of a car.
According to the invention, the improved temperature monitoring device comprises a body of metal or metal alloy of high thermal conductivity having within the body a bore closed at one end and, at its other end, opening into an outer surface of the body; a resistance temperature detector which is housed at the closed end of the bore and whose electrically insulating sleeve or body is made of and/or is surrounded by thermally insulating material, the protruding lead wires of the resistance temperature detector being electrically connected to conductors of an electric cable which are electrically insulated the one from the other or others and which are sealed in the open end of the bore and the electrical connections between the protruding lead wires of the resistance temperature detector and the conductors of the electric cable being embedded in and/or surrounded by thermally insulating material; and, integral with or secured to the body, means for connecting the body to a block or other body.
If desired, the resistance temperature detector may be cemented or otherwise permanently secured at the closed end of the bore.
The detector element of the resistance temperature detector may comprise a length of wire of metal or metal alloy, usually but not necessarily platinum, wound around an elongate former in at least two coils of opposite hand, one overlying the other, the element being housed in a sleeve of electrically insulating material with end portions of the wire protruding from one end of the sleeve and constituting the lead wires. One alternative detector element that may be employed comprises a substantially rigid body of electrically insulating material within which, or on a surface of which, is an elongate layer or film of electrically conductiye metal or metal alloy, e.g. platinum, which elongate layer is of such a configuration as to provide a path of the required electrically conductive length and which, at each of its ends, is electrically connected to at least one lead wire.A further alternative detector element that may be employed comprises a small amount of semi-conductor material surrounded by a body of electrically insulating material.
The electrically insulating sleeve, body or material of the resistance temperature detector preferably is made of or is a ceramic material or glass.
Each protruding lead wire of the resistance temperature detector may be electrically connected to one conductor of the electric cable or at least one of the protruding lead wires of the resistance temperature detector may be electrically connected to two conductors of the electric cable.
Each protruding lead wire of the resistant temperature detector may be directly electrically connected to a conductor of the electric cable or each protruding lead wire of the resistance temperature detector may be indirectly electrically connected to a conductor of the electric cable by a separate elongate conductor extending along the bore of the body and electrically connected at its ends to the protruding lead wire and to the conductor of the cable.Where a lead wire of the resistance temperature detector is indirectly electrically connected to two conductors of the electric cable, such electrical connection preferably is effected by a separate elongate conductor which is folded intermediate of its ends into a hairpin shape, the folded end of the conductor being electrically connected to the protruding lead wire and the two free ends of the conductor being electrically connected to the conductors of the cable.
The separate electric conductors extending between and indirectly electrically interconnecting the protruding lead wires of the resistance temperature detector and the conductors of the electric cable may be surrounded by a single sleeve of ceramic or other thermally insulating material or each separate elongate conductor extending between and indirectly electrically interconnecting a protruding lead wire of the resistance temperature detector and a conductor of the electric cable may be surrounded by its own sleeve of ceramic or other thermally insulating material. Additionally, or alternatively, any space in the bore of the body between the resistance temperature detector and the electric cable conductors sealed at the open end of the bore may be filled with compacted mineral insulation, e.g.
magnesium oxide or aluminium oxide, or with a high temperature potting compound, e.g. heat resistant inorganic adhesive.
At the open end of the bore of the body of metal or metal alloy, the electric cable may be passed through a length of coil spring which, at one of its ends, is secured within the open end of the bore or is otherwise secured to the metal body to provide flexible protection for the electric cable.
The body of metal or metal alloy of high thermal conductivity is preferably of elongate shape with the closed bore of the body coaxial with the longitudinal axis of the body. Preferably, over at least an intermediate portion of its length, the body has a transverse cross-section of substantially circular shape and carries an external screw thread by means of which the body can be connected to a block or other body. In this case, the body of metal or metal alloy of high thermal conductivity preferably has, at the end of the body remote from the resistance temperature detector, an external shape in the form of a nut to facilitate screwing of the body into a tapped hole in a block or other body.Alternatively, the body of metal or metal alloy may be formed with at least one hole or slot or may be otherwise so shaped that the body can be detachably secured to a block or other body by separately formed fastening means.
The electric cable whose conductors are electrically connected to the protruding lead wires of the resistance temperature detector preferably comprises a flexible cable having two, three or four separately insulated electric conductors but, in some circumstances, it may be a mineral insulated electric cable comprising at least two elongate conductors embedded in, and electrically insulated from one another and from a surrounding sheath of metal or metal alloy by, compacted mineral insulating powder, e.g. magnesium oxide or aluminium oxide.
The invention is further illustrated by a description, by way of example, of two preferred temperature monitoring devices with reference to the accompanying drawing, in which:
Figure 1 is a sectional side view of the first preferred temperature monitoring device, and
Figure 2 is a similar view of the second preferred temperature monitoring device.
Referring to Figure 1, the first preferred temperature monitoring device comprises an elongate body 1 of having within the body a bore 2 closed at one end and, at its other end, opening into an outer surface of the body. A resistance temperature detector 3 is housed in the bore 2 at its closed end and one protruding lead wire 5 of the resistance temperature detector is electrically connected to a separate elongate conductor 6 extending along the bore and the other protruding lead wire 5 is electrically connected to the folded end of a separate elongate conductor 7 which has been folded intermediate of its ends into a hair pin shape.The separate elongate conductor 6 is electrically connected to the conductor 11 of an insulated conductor 10 and the free ends of the separate elongate conductor 7 are electrically connected to the conductors 11 of two insulated conductors 10 so that one of the protruding lead wires 5 is indirectly electrically connected to two insulated conductors. The insulated conductors 10 constitute component parts of an electric cable (not shown) and are sealed in the open end of the bore 2 of the body 1 by heat resistant electrically insulating sealing compound 12. The separate elongate conductor 6 and the two lengths of separate elongate conductor 7 and the connections between these conductors and the conductors 11 are surrounded by a single sleeve 14 of ceramic material.
The space in the bore 2 of the body 1 between the resistance temperature detector 3, which has a sleeve 4 of ceramic material surrounding the detector element, and the sealing compound 12 is filled with compacted mineral insulation 15. Over an intermediate portion of its length, the body 1 has a tranverse cross-section of circular shape and carries an external screw thread 17 by means of which the body can be connected to a block or other body. Between the external screw thread 17 and the sealed open end of the bore 2, the body has an external shape in the form of a nut 18 to facilitate screwing of the body into a tapped hole in a block or other body.
The second preferred temperature monitoring device shown in Figure 2 comprises an elongate body 21 of which has a bore 22 closed at one end and, at its other end, opening into an end surface of the body. A resistance temperature detector 23 is housed in the bore 22 at its closed end and one protruding lead wire 25 of the resistance temperature detector is electrically connected to a separate elongate conductor 26 extending along the bore and the other protruding lead wire 25 is electrically connected to separate elongate conductors 27 and 28 extending along the bore. Each of the separate elongate conductors 26, 27 and 28 is electrically connected to one of three conductors 31 of three insulated conductors 30 of an electric cable (not shown).Adjacent the open end of the bore 22, the insulated conductors 30 are surrounded by a length of coil spring 39 and the insulated conductors and the coil spring are secured within the open end of the bore by a high temperature potting compound 32. Each of the elongate conductors 26, 27 and 28 and the connection between this conductor and the conductor 21 are surrounded by a separately formed sleeve 34 of ceramic material. The detector element (not shown) of the resistance temperature detector 23 is surrounded by a body 24 of ceramic material and any space in the bore 2 between the body 24 of the resistance temperature detector and the high temperature potting compound 32 is filled with compacted mineral insulation 35. Between its ends, the elongate body 21 is of circular cross-section and has an external screw thread 37 and, adjacent the screw thread, has an external shape in the form of a nut 38 to facilitate screwing of the body into a tapped hole in a block or other body.
Claims (21)
1. A temperature monitoring device comprising a body of metal or metal alloy of high thermal conductivity having within the body a bore closed at one end and, at its other end, opening into an outer surface of the body; a resistance temperature detector which is housed at the closed end of the bore and whose electrically insulating sleeve or body is made of and/or is surrounded by thermally insulating material, the protruding lead wires of the resistance temperature detector being electrically connected to conductors of an electric cable which are electrically insulated the one from the other or others and which are sealed in the open end of the bore and the electrical connections between the protruding lead wires of the resistance temperature detector and the conductors of the electric cable being embedded in and/or surrounded by thermally insulating material; and, integral with or secured to the body, means for connecting the body to a block or other body.
2. A temperature monitoring device as claimed in
Claim 1, wherein the resistance temperature detector is cemented or otherwise permanently secured at the closed end of the bore.
3. A temperature monitoring device as claimed in
Claim 1 or 2, wherein at least one of the protruding lead wires of the resistance temperature detector is electrically connected to two conductors of the electric cable.
4. A temperature monitoring device as claimed in any one of the preceding Claims, wherein each protruding lead wire of the resistance temperature detector is indirectly electrically connected to a conductor of the electric cable by a separate elongate conductor extending along the bore of the body and electrically connected at its ends to the protruding lead wire and to the conductor of the cable.
5. A temperature monitoring device as claimed in
Claim 3 in which a lead wire of the resistance temperature detector is indirectly electrically connected to two conductors of the electric cable, wherein said electrical connection is effected by a separate elongate conductor which is folded intermediate of its ends into a hairpin shape, the folded end of the conductor being electrically connected to the protruding lead wire and the two free ends of the conductor being electrically connected to the two conductors of the cable.
6. A temperature monitoring device as claimed in
Claim 4 or 5, wherein the separate electric conductors extending between and indirectly electrically interconnecting the protruding lead wires of the resistance temperature detector and the conductors of the electric cable are surrounded by a single sleeve of ceramic or other thermally insulating material.
7. A temperature monitoring device as claimed in
Claim 4 or 5, wherein each separate elongate conductor extending between and indirectly electrically connecting a protruding lead wire of the resistance temperature detector and a conductor of the electric cable is surrounded by its own sleeve of ceramic or other thermally insulating material.
8. A temperature monitoring device as claimed in any one of the preceding Claims, wherein any space in the bore of the body between the resistance temperature detector and the electric cable conductors sealed at the open end of the bore is filled with compacted mineral insulation.
9. A temperature monitoring device as claimed in any one of Claims 1 to 7, wherein any space in the bore of the body between the resistance temperature detector and the electric cable conductors sealed at the open end of the bore is filled with a high temperature potting compound.
10. A temperature monitoring device as claimed in any one of the preceding Claims, wherein, at the open end of the bore of the body of metal or metal alloy, the electric cable passes through a length of coil spring which, at one of its ends, is secured within the open end of the bore or is otherwise secured to the metal body to provide flexible protection for the electric cable.
Il. A temperature monitoring device as claimed in any one of the preceding Claims, wherein the body of metal or metal alloy of high thermal conductivity is of elongate shape with the closed bore of the body coaxial with the longitudinal axis of the body.
12. A temperature monitoring device as claimed in
Claim 11, wherein, over at least an intermediate portion of its length, the body has a transverse cross-section of substantially circular shape and carries an external screw thread by means of which the body can be connected to a block or other body.
13. A temperature monitoring device as claimed in
Claim 12, wherein the body of metal or metal alloy of high thermal conductivity has, at the end of the body remote from the resistance temperature detector, an external shape in the form of a nut to facilitate screwing of the body into a tapped hole in a block or other body.
14. A temperature monitoring device as claimed in any one of Claims 1 to 12, wherein the body of metal or metal alloy is formed with at least one hole or slot or is otherwise so shaped that the body can be detachably secured to a block or other body by separately formed fastening means.
15. A temperature monitoring device as claimed in any one of the preceding Claims, wherein the electric cable whose conductors are electrically connected to protruding lead wires of the resistance temperature detector comprises a flexible cable having at least two separately insulated electric conductors.
16. A temperature monitoring device as claimed in any one of Claims 1 to 14, wherein the electric cable whose conductors are electrically connected to the protruding lead wires of the resistance temperature detector is a mineral insulated electric cable comprising at least two elongate conductors embedded in, and electrically insulated from one another and from a surrounding sheath of metal or metal alloy by, compacted mineral insulating powder.
17. A temperature monitoring device as claimed in any one of the preceding Claims, wherein the detector element of the resistance temperature detector comprises a length of wire of metal or metal alloy wound around an elongate former in at least two coils of opposite hand, one overlying the other, the element being housed in a sleeve of electrically insulating material with end portions of the wire protruding from one end of the sleeve and constituting the lead wires.
18. A temperature monitoring device as claimed in any one of Claims 1 to 16, wherein the detector element of the resistance temperature detector comprises a substantially rigid body of electrically insulating material within which, or on a surface of which, is an elongate layer or film of electrically conductive metal or metal alloy, which elongate layer is of such a configuration as to provide a path of the required electrically conductive length and which, at each of its ends, is electrically connected to at least one lead wire.
19. A temperature monitoring device as claimed in any one of Claims 1 to 16, wherein the detector element of the resistance temperature device comprises a semi-conductor material surrounded by a body of electrically insulating material.
20. A temperature monitoring device as claimed in any one of the preceding Claims, wherein the electrically insulating sleeve, body or material of the resistance temperature detector is made of or is a ceramic material or glass.
21. A temperature monitoring device substantially as hereinbefore described with reference to and as shown in
Figure 1 or 2 of the accompanying drawing.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB878709077A GB8709077D0 (en) | 1987-04-15 | 1987-04-15 | Temperature monitoring device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB8808858D0 GB8808858D0 (en) | 1988-05-18 |
| GB2203554A true GB2203554A (en) | 1988-10-19 |
Family
ID=10615902
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB878709077A Pending GB8709077D0 (en) | 1987-04-15 | 1987-04-15 | Temperature monitoring device |
| GB08808858A Withdrawn GB2203554A (en) | 1987-04-15 | 1988-04-14 | An improved temperature monitoring device |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB878709077A Pending GB8709077D0 (en) | 1987-04-15 | 1987-04-15 | Temperature monitoring device |
Country Status (1)
| Country | Link |
|---|---|
| GB (2) | GB8709077D0 (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5046857A (en) * | 1990-05-23 | 1991-09-10 | General Motors Corporation | Plastic thermal probe assembly with press fit sensor |
| GB2269902A (en) * | 1992-08-21 | 1994-02-23 | Caradon Mira | Temperature sensor |
| US5949324A (en) * | 1997-12-29 | 1999-09-07 | Segler; John M. | Temperature responsive probe apparatus |
| US6341892B1 (en) * | 2000-02-03 | 2002-01-29 | George Schmermund | Resistance thermometer probe |
| FR2867274A1 (en) * | 2004-03-03 | 2005-09-09 | Aslec | Temperature measuring sensor for use in e.g. building, has body including thread screwed on any metallic or plastic fixation clamp and threaded part terminated by metal pellet which contacts with pipe when sensor is installed on pipe |
| US7012502B2 (en) | 2002-02-07 | 2006-03-14 | Denso Corporation | Sensor and manufacturing method thereof |
| EP1709407A1 (en) * | 2003-12-12 | 2006-10-11 | Rosemount Aerospace Inc. | Housing for temperature sensing assemblies |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB996748A (en) * | 1962-05-16 | 1965-06-30 | Bailey Meter Co | Improvements in or relating to temperature measuring apparatus |
| US3913058A (en) * | 1972-07-25 | 1975-10-14 | Ngk Spark Plug Co | Thermosensor |
| US4137768A (en) * | 1978-03-28 | 1979-02-06 | Rosemount Inc. | Adjustable depth thermowell |
-
1987
- 1987-04-15 GB GB878709077A patent/GB8709077D0/en active Pending
-
1988
- 1988-04-14 GB GB08808858A patent/GB2203554A/en not_active Withdrawn
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB996748A (en) * | 1962-05-16 | 1965-06-30 | Bailey Meter Co | Improvements in or relating to temperature measuring apparatus |
| US3913058A (en) * | 1972-07-25 | 1975-10-14 | Ngk Spark Plug Co | Thermosensor |
| US4137768A (en) * | 1978-03-28 | 1979-02-06 | Rosemount Inc. | Adjustable depth thermowell |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5046857A (en) * | 1990-05-23 | 1991-09-10 | General Motors Corporation | Plastic thermal probe assembly with press fit sensor |
| GB2269902A (en) * | 1992-08-21 | 1994-02-23 | Caradon Mira | Temperature sensor |
| GB2269902B (en) * | 1992-08-21 | 1996-05-01 | Caradon Mira Ltd | Temperature sensor |
| US5949324A (en) * | 1997-12-29 | 1999-09-07 | Segler; John M. | Temperature responsive probe apparatus |
| US6341892B1 (en) * | 2000-02-03 | 2002-01-29 | George Schmermund | Resistance thermometer probe |
| US7012502B2 (en) | 2002-02-07 | 2006-03-14 | Denso Corporation | Sensor and manufacturing method thereof |
| EP1709407A1 (en) * | 2003-12-12 | 2006-10-11 | Rosemount Aerospace Inc. | Housing for temperature sensing assemblies |
| FR2867274A1 (en) * | 2004-03-03 | 2005-09-09 | Aslec | Temperature measuring sensor for use in e.g. building, has body including thread screwed on any metallic or plastic fixation clamp and threaded part terminated by metal pellet which contacts with pipe when sensor is installed on pipe |
Also Published As
| Publication number | Publication date |
|---|---|
| GB8709077D0 (en) | 1987-05-20 |
| GB8808858D0 (en) | 1988-05-18 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |