GB2107516A - Thermocouple - Google Patents

Thermocouple Download PDF

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Publication number
GB2107516A
GB2107516A GB08131031A GB8131031A GB2107516A GB 2107516 A GB2107516 A GB 2107516A GB 08131031 A GB08131031 A GB 08131031A GB 8131031 A GB8131031 A GB 8131031A GB 2107516 A GB2107516 A GB 2107516A
Authority
GB
United Kingdom
Prior art keywords
cable
thermocouple
conductors
conductor
sheath
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Withdrawn
Application number
GB08131031A
Inventor
Frank David Watts Charlesworth
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
UK Atomic Energy Authority
Original Assignee
UK Atomic Energy Authority
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by UK Atomic Energy Authority filed Critical UK Atomic Energy Authority
Priority to GB08131031A priority Critical patent/GB2107516A/en
Publication of GB2107516A publication Critical patent/GB2107516A/en
Withdrawn legal-status Critical Current

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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
    • G01K7/04—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 the object to be measured not forming one of the thermoelectric materials
    • G01K7/06—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 the object to be measured not forming one of the thermoelectric materials the thermoelectric materials being arranged one within the other with the junction at one end exposed to the object, e.g. sheathed type
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10N10/00—Thermoelectric devices comprising a junction of dissimilar materials, i.e. devices exhibiting Seebeck or Peltier effects
    • H10N10/10—Thermoelectric devices comprising a junction of dissimilar materials, i.e. devices exhibiting Seebeck or Peltier effects operating with only the Peltier or Seebeck effects
    • H10N10/17—Thermoelectric devices comprising a junction of dissimilar materials, i.e. devices exhibiting Seebeck or Peltier effects operating with only the Peltier or Seebeck effects characterised by the structure or configuration of the cell or thermocouple forming the device
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10N10/00—Thermoelectric devices comprising a junction of dissimilar materials, i.e. devices exhibiting Seebeck or Peltier effects
    • H10N10/80—Constructional details
    • H10N10/85—Thermoelectric active materials
    • H10N10/851—Thermoelectric active materials comprising inorganic compositions
    • H10N10/854—Thermoelectric active materials comprising inorganic compositions comprising only metals

Abstract

A thermocouple is provided by a cable (10) of coaxial form with inner (11) and outer (12) conductors of thermocouple forming materials and with the conductors electrically joined together at one end of the cable to form the thermocouple junction (14). The inner and outer conductors are preferably of chromel and stainless steel respectively. <IMAGE>

Description

SPECIFICATION Thermocouple This invention relates to thermocouples.
It is an object of the present invention to provide a thermocouple of improved construction.
A thermocouple according to the present invention is provided by a cable of coaxial form with inner and outer conductors of respective thermocouple forming materials and with the conductors joined together at one end of the cable. The conductors are preferably chosen to be of non-oxidising material such as stainless steel and "Chromel" and separated by oxide insulant in the manner well known in mineral insulated cables.
To form a thermocouple in accordance with the invention a desired length of cable is cut from a stock cable and the end prepared to expose the inner conductor ("Chromel") and to bring it into contact with the outer conductor (stainless steel). The two conductors are then welded together such as by capacitor discharge or by electron beam.
With thermocouples according to the present invention a number of advantages arise.
For example: a. The basic cable is less costly.
b. The manufacturing steps are simpler and less costly.
c. The thermocouple junction can have a low thermal capacity and be located very close to the exterior of the cable end, and thereby giving a fast response to temperature changes in the vicinity of the junction.
d. The basic cable can have smailer dimensions than presently used thermocouple cable.
This not only has physical advantages like reduction of space but also thermal advantages like low heat loss.
e. There is no requirement for the cable to be terminated at a at a bead which is in turn secured to the cable sheath and hence reliability is increased.
f. If the junction fails then it will be a complete failure and identifyable as such.
g. As the cable has only a single conductor in a sheath, heat loss along the cable is further reduced and hence less measurement error is likely to occur.
h. The option to avoid the use of oxidisable material is available as the customary use of Alumel (RTM) is no longer required. This factor also enhances reliability as failures or misleading measurements can arise with Alumel oxidation.
One form of the invention will now be described with reference to the accompanying drawing which is a diagrammatical sectional elevation.
The drawing shows a cable 10 of coaxial form with an inner conductor 11 and an outer conductor-cum-sheath 1 2. The two conductors are separated by oxide insulant 1 3 except at their ends where they are welded together by a capacitative discharge weld to form a thermocouple junction 14.
1. A thermocouple provided by a cable of coaxial form with inner and outer conductors of respective thermocouple forming materials and with the conductors electrically joined together at one end of the cable.
2. A thermocouple as claimed in claim 1 in which the outer conductor is a stainless steel sheath and the inner conductor is "Chromel" separated from the outer conductor by oxide insulant.
3. A thermocouple substantially as hereinbefore described with reference to the drawing.
**WARNING** end of DESC field may overlap start of CLMS **.

Claims (3)

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION Thermocouple This invention relates to thermocouples. It is an object of the present invention to provide a thermocouple of improved construction. A thermocouple according to the present invention is provided by a cable of coaxial form with inner and outer conductors of respective thermocouple forming materials and with the conductors joined together at one end of the cable. The conductors are preferably chosen to be of non-oxidising material such as stainless steel and "Chromel" and separated by oxide insulant in the manner well known in mineral insulated cables. To form a thermocouple in accordance with the invention a desired length of cable is cut from a stock cable and the end prepared to expose the inner conductor ("Chromel") and to bring it into contact with the outer conductor (stainless steel). The two conductors are then welded together such as by capacitor discharge or by electron beam. With thermocouples according to the present invention a number of advantages arise. For example: a. The basic cable is less costly. b. The manufacturing steps are simpler and less costly. c. The thermocouple junction can have a low thermal capacity and be located very close to the exterior of the cable end, and thereby giving a fast response to temperature changes in the vicinity of the junction. d. The basic cable can have smailer dimensions than presently used thermocouple cable. This not only has physical advantages like reduction of space but also thermal advantages like low heat loss. e. There is no requirement for the cable to be terminated at a at a bead which is in turn secured to the cable sheath and hence reliability is increased. f. If the junction fails then it will be a complete failure and identifyable as such. g. As the cable has only a single conductor in a sheath, heat loss along the cable is further reduced and hence less measurement error is likely to occur. h. The option to avoid the use of oxidisable material is available as the customary use of Alumel (RTM) is no longer required. This factor also enhances reliability as failures or misleading measurements can arise with Alumel oxidation. One form of the invention will now be described with reference to the accompanying drawing which is a diagrammatical sectional elevation. The drawing shows a cable 10 of coaxial form with an inner conductor 11 and an outer conductor-cum-sheath 1 2. The two conductors are separated by oxide insulant 1 3 except at their ends where they are welded together by a capacitative discharge weld to form a thermocouple junction 14. CLAIMS
1. A thermocouple provided by a cable of coaxial form with inner and outer conductors of respective thermocouple forming materials and with the conductors electrically joined together at one end of the cable.
2. A thermocouple as claimed in claim 1 in which the outer conductor is a stainless steel sheath and the inner conductor is "Chromel" separated from the outer conductor by oxide insulant.
3. A thermocouple substantially as hereinbefore described with reference to the drawing.
GB08131031A 1981-10-14 1981-10-14 Thermocouple Withdrawn GB2107516A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB08131031A GB2107516A (en) 1981-10-14 1981-10-14 Thermocouple

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB08131031A GB2107516A (en) 1981-10-14 1981-10-14 Thermocouple

Publications (1)

Publication Number Publication Date
GB2107516A true GB2107516A (en) 1983-04-27

Family

ID=10525161

Family Applications (1)

Application Number Title Priority Date Filing Date
GB08131031A Withdrawn GB2107516A (en) 1981-10-14 1981-10-14 Thermocouple

Country Status (1)

Country Link
GB (1) GB2107516A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2563937A1 (en) * 1984-05-07 1985-11-08 Bell Irh Proprietary Ltd HIGH TEMPERATURE STABLE CABLES AND DEVICES COMPRISING SUCH CABLES
EP0161986A2 (en) * 1984-05-07 1985-11-21 Nicrobell Pty Limited Stable high temperature cables and devices made therefrom
US4834807A (en) * 1986-11-10 1989-05-30 Bell-Irh Limited Thermocouples of enhanced stability
WO1996019827A1 (en) * 1994-12-22 1996-06-27 Abb Industry Oy A method of bonding heat sink elements to a solid-state power component and a solid-state power component equipped with an integral heat sink
US9702764B2 (en) 2010-03-31 2017-07-11 Cambridge Enterprise Limited Thermocouple apparatus and method

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2563937A1 (en) * 1984-05-07 1985-11-08 Bell Irh Proprietary Ltd HIGH TEMPERATURE STABLE CABLES AND DEVICES COMPRISING SUCH CABLES
EP0161986A2 (en) * 1984-05-07 1985-11-21 Nicrobell Pty Limited Stable high temperature cables and devices made therefrom
GB2159663A (en) * 1984-05-07 1985-12-04 Bell Irh Pty Ltd Cables including thermoelements
EP0161986A3 (en) * 1984-05-07 1987-12-02 Bell-Irh Proprietary Limited Stable high temperature cables and devices made therefrom
US4834807A (en) * 1986-11-10 1989-05-30 Bell-Irh Limited Thermocouples of enhanced stability
WO1996019827A1 (en) * 1994-12-22 1996-06-27 Abb Industry Oy A method of bonding heat sink elements to a solid-state power component and a solid-state power component equipped with an integral heat sink
US9702764B2 (en) 2010-03-31 2017-07-11 Cambridge Enterprise Limited Thermocouple apparatus and method
US10168228B2 (en) 2010-03-31 2019-01-01 Cambridge Enterprise Limited Thermocouple apparatus and method

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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)