CA1288174C - Thermocouple for corrosive environments - Google Patents
Thermocouple for corrosive environmentsInfo
- Publication number
- CA1288174C CA1288174C CA 577998 CA577998A CA1288174C CA 1288174 C CA1288174 C CA 1288174C CA 577998 CA577998 CA 577998 CA 577998 A CA577998 A CA 577998A CA 1288174 C CA1288174 C CA 1288174C
- Authority
- CA
- Canada
- Prior art keywords
- tube
- thermocouple
- gas
- cover tube
- pressure
- 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 - Lifetime
Links
- 239000007789 gas Substances 0.000 claims abstract description 12
- 239000011800 void material Substances 0.000 claims abstract description 4
- 238000005260 corrosion Methods 0.000 claims abstract description 3
- 230000007797 corrosion Effects 0.000 claims abstract description 3
- 239000011261 inert gas Substances 0.000 claims abstract description 3
- 239000011231 conductive filler Substances 0.000 claims abstract 2
- 238000009530 blood pressure measurement Methods 0.000 claims 1
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 abstract description 4
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 abstract description 2
- 229910052786 argon Inorganic materials 0.000 abstract description 2
- 229910052796 boron Inorganic materials 0.000 abstract description 2
- 239000000919 ceramic Substances 0.000 abstract description 2
- 229910052500 inorganic mineral Inorganic materials 0.000 abstract description 2
- 239000007788 liquid Substances 0.000 abstract description 2
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 abstract description 2
- 229910052753 mercury Inorganic materials 0.000 abstract description 2
- 239000011707 mineral Substances 0.000 abstract description 2
- 230000035515 penetration Effects 0.000 abstract description 2
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
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
- G01K7/02—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using thermoelectric elements, e.g. thermocouples
- G01K7/026—Arrangements for signalling failure or disconnection of thermocouples
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measuring Fluid Pressure (AREA)
Abstract
ABSTRACT
A mineral insulated thermocouple cable is inserted into a cover tube. The cover tube is sealed shut beyond the end of the thermocouple hot junction. The void within the cover tube in and around the thermocouple hot junction area has a heat conductive filler such as a boron ceramic preform or even some liquid mercury. The tube is filled with an inert gas such as argon, pressurized from a gas source and connected to a negative pressure alarm or gauge for detecting pressure loss. When there is an escape of gas from the tube, indicating penetration of the gas tube wall by corrosion, thereby causing a reduction in pressure in the gas tube, the reduction in pressure is observed at the gauge, or it triggers the alarm.
A mineral insulated thermocouple cable is inserted into a cover tube. The cover tube is sealed shut beyond the end of the thermocouple hot junction. The void within the cover tube in and around the thermocouple hot junction area has a heat conductive filler such as a boron ceramic preform or even some liquid mercury. The tube is filled with an inert gas such as argon, pressurized from a gas source and connected to a negative pressure alarm or gauge for detecting pressure loss. When there is an escape of gas from the tube, indicating penetration of the gas tube wall by corrosion, thereby causing a reduction in pressure in the gas tube, the reduction in pressure is observed at the gauge, or it triggers the alarm.
Description
381~
This invention relates to a thermocouple for corrosive environments.
The purpose of this assembly is to provide a safety margin against process or operational production loss where knowledge of temperature levels is a critical requirement.
This assembly would only be used in some of the harsher types of operational environments.
The operation of this assembly should provide an operator with a sensitive thermocouple response and maintain a long operational assembly lifespan. It will also provide an operational time window during which to effect repair or replacement, as an additional safety factor.
In order that the invention may be clearly understood, the preferred embodiment thereof will now be described in detail by way of example, with reference to the accompanying drawings, in which:
Fig. 1 is a cut-away view of the preferred embodiment.
The invention involves the use of a mineral insulated thermocouple cable 1 with an outside diameter of approximately 0.125 inch inserted into a cover tube 2 with an inside diameter of approximately 0.375 inch. The cover tube is sealed shut beyond the end of the thermocouple hot junction area 3, the thermocouple preferably being an ungrounded type.
The void within the cover tube in and around the thermocouple hot junction area is sensitized by using a filler 4 of heat sensitive properties such as a boron ceramic preform or even some liquid mercury. The cold junction end of the cover tube 38~7 ~
assembly has a Swagelok (trademark) "T" reducer fitting 5.
The fitting provides a gas tight seal between the cable 1 and the tube 2 as well as the atmosphere. The balance of all internal tube voids is filled with an inert gas such as argon 6. The gas is pressurized from a gas source 7 and is connected to a negative pressure alarm or gauge 8 for detecting pressure loss in the gas tube.
When there is an escape of gas from the tube, indicating penetration of the gas tube wall by corrosion, thereby causing a reduction in pressure in the gas tube, the reduction in pressure is observed at the gauge, or it triggers the alarm.
It will be appreciated that the above description relates to the preferred embodiment by way of example only.
Many variations on the invention will be obvious to those knowledgeable in the field, and such obvious variations are within the scope of the invention as described and claimed, whether or not expressly described.
This invention relates to a thermocouple for corrosive environments.
The purpose of this assembly is to provide a safety margin against process or operational production loss where knowledge of temperature levels is a critical requirement.
This assembly would only be used in some of the harsher types of operational environments.
The operation of this assembly should provide an operator with a sensitive thermocouple response and maintain a long operational assembly lifespan. It will also provide an operational time window during which to effect repair or replacement, as an additional safety factor.
In order that the invention may be clearly understood, the preferred embodiment thereof will now be described in detail by way of example, with reference to the accompanying drawings, in which:
Fig. 1 is a cut-away view of the preferred embodiment.
The invention involves the use of a mineral insulated thermocouple cable 1 with an outside diameter of approximately 0.125 inch inserted into a cover tube 2 with an inside diameter of approximately 0.375 inch. The cover tube is sealed shut beyond the end of the thermocouple hot junction area 3, the thermocouple preferably being an ungrounded type.
The void within the cover tube in and around the thermocouple hot junction area is sensitized by using a filler 4 of heat sensitive properties such as a boron ceramic preform or even some liquid mercury. The cold junction end of the cover tube 38~7 ~
assembly has a Swagelok (trademark) "T" reducer fitting 5.
The fitting provides a gas tight seal between the cable 1 and the tube 2 as well as the atmosphere. The balance of all internal tube voids is filled with an inert gas such as argon 6. The gas is pressurized from a gas source 7 and is connected to a negative pressure alarm or gauge 8 for detecting pressure loss in the gas tube.
When there is an escape of gas from the tube, indicating penetration of the gas tube wall by corrosion, thereby causing a reduction in pressure in the gas tube, the reduction in pressure is observed at the gauge, or it triggers the alarm.
It will be appreciated that the above description relates to the preferred embodiment by way of example only.
Many variations on the invention will be obvious to those knowledgeable in the field, and such obvious variations are within the scope of the invention as described and claimed, whether or not expressly described.
Claims
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A thermocouple assembly comprising a thermocouple cable terminating at a junction sealingly inserted in a cover tube, said cover tube being sealed shut beyond the end of the thermocouple junction, the void within the cover tube in and around the thermocouple junction area containing a heat conductive filler, the remaining void containing an inert gas connected to a gas supply and pressure measurement device, whereby a loss of pressure indicative of corrosion may be received.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 577998 CA1288174C (en) | 1988-09-21 | 1988-09-21 | Thermocouple for corrosive environments |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 577998 CA1288174C (en) | 1988-09-21 | 1988-09-21 | Thermocouple for corrosive environments |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1288174C true CA1288174C (en) | 1991-08-27 |
Family
ID=4138765
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 577998 Expired - Lifetime CA1288174C (en) | 1988-09-21 | 1988-09-21 | Thermocouple for corrosive environments |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1288174C (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR3028614A1 (en) * | 2014-11-19 | 2016-05-20 | Valeo Systemes De Controle Moteur | TEMPERATURE SENSOR |
| FR3030733A1 (en) * | 2014-12-22 | 2016-06-24 | Valeo Systemes De Controle Moteur | TEMPERATURE SENSOR |
| CN106644135A (en) * | 2015-10-28 | 2017-05-10 | 沈阳沈真真空技术有限责任公司 | Thermocouple temperature-measuring device for vacuum furnace |
-
1988
- 1988-09-21 CA CA 577998 patent/CA1288174C/en not_active Expired - Lifetime
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR3028614A1 (en) * | 2014-11-19 | 2016-05-20 | Valeo Systemes De Controle Moteur | TEMPERATURE SENSOR |
| WO2016079428A1 (en) * | 2014-11-19 | 2016-05-26 | Valeo Systemes De Controle Moteur | Temperature sensor |
| CN107110713A (en) * | 2014-11-19 | 2017-08-29 | 法雷奥电机控制系统公司 | Temperature sensor |
| US10502635B2 (en) | 2014-11-19 | 2019-12-10 | Valeo Systemes De Controle Moteur | Temperature sensor |
| FR3030733A1 (en) * | 2014-12-22 | 2016-06-24 | Valeo Systemes De Controle Moteur | TEMPERATURE SENSOR |
| WO2016102809A1 (en) * | 2014-12-22 | 2016-06-30 | Valeo Systemes De Controle Moteur | Temperature sensor |
| CN106644135A (en) * | 2015-10-28 | 2017-05-10 | 沈阳沈真真空技术有限责任公司 | Thermocouple temperature-measuring device for vacuum furnace |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKLA | Lapsed |