Reference junction for thermocouple measuring

• US 5,246,293 A
• Filed: 02/19/1992
• Issued: 09/21/1993
• Est. Priority Date: 03/19/1991
• Status: Expired due to Fees

• Current Assignee: Oy Beamex AB
• Original Assignee: Oy Beamex AB
• Inventors: Savolainen, Jorma, Laitinen, Markku, Luotsinen, Osmo
• Primary Examiner(s): YASICH, DANIEL
• Application Number:
  US07/838,555
• Time in Patent Office: 580 Days
• Field of Search: 374/180, 374/181, 374/208, 374/179
• US Class Current: 374/181
• CPC Class Codes: G01K 7/023 provided with specially adapted connectors connectors per se H01R
• CPC Class Codes: G01K 7/04 the object to be measured not forming one of the thermoelectric materials
• CPC Class Codes: G01K 7/12 Arrangements with respect to the cold junction, e.g. preventing influence of temperature of surrounding air
• CPC Class Codes: H01R 4/4854 using a wire spring

Abstract

The invention relates to a reference junction for thermocouple measuring, comprising two reference temperature blocks (5) connected with one another heat conductively but dielectrically, one block for each thermocouple conductor and each block provided with a contact surface (4) for receiving the thermocouple conductor, and means (1) for retaining the thermocouple conductors or their attached contacts in contact with the contact surfaces (4) of the respective reference temperature blocks (5). To enable rapid fixing and detachment of the thermocouple conductors or their attached contacts, the means for retaining the thermocouple conductors in contact with their contact surfaces (4) comprise a single unitary retention block (1) pressed by spring-biased action against the contact surfaces.

Claims

1. A reference junction for thermocouple measuring, comprising two reference temperature blocks (5) connected with one another heat conductively but dielectrically, one block for each thermocouple conductor and each block provided with a contact surface (4) for receiving the thermocouple conductor, and means (1) for retaining the thermocouple conductors in contact with the contact surfaces (4) of the respective reference temperature blocks (5), characterized in that the means for retaining the thermocouple conductors in contact with their contact surfaces (4) comprise a single unitary retention block (1) housed in a housing (12) and pressed against the contact surface by spring-biased action opposing said housing.

2. A reference junction for thermocouple measuring in accordance with claim 1, characterized in that the retention block (1) comprises a portion adapted to slide between the reference temperature blocks (5) and the housing (12) and is provided with apertures (3'"'"', 3a'"'"') corresponding to the inlet apertures (3, 3a) of the housing (12).

3. A reference junction for thermocouple measuring in accordance with claim 1, characterized in that the retention block (1) comprises a separate friction surface (2) for each thermocouple conductor.

4. A reference junction for thermocouple measuring in accordance with claim 3, wherein said housing (12) encases the reference temperature blocks (5), said housing being provided with apertures (3, 3a) aligned with the contact surfaces (4) of the temperature reference blocks (5) for the inlet of the thermocouple conductors, characterized in that the retention block (1) is adapted to close the inlet apertures when no thermocouple conductors are connected to the reference junction.

5. A reference junction for thermocouple measuring in accordance with claim 4, characterized in that the retention block (1) comprises a portion adapted t slide between the reference temperature blocks (5) and the housing (12) and is provided with apertures (3'"'"', 3a'"'"') corresponding to the inlet apertures (3, 3a) of the housing (12).

6. A reference junction for thermocouple measuring in accordance with claim 3, characterized in that the retention block (1) is spring-biased by means of two springs (6) located opposite the respective contact surface (4) of the reference temperature block (5) in each case.

7. A reference junction for thermocouple measuring in accordance with claim 6, characterized in that the retention block (1) comprises a portion adapted to slide between the reference temperature blocks (5) and the housing (12) and is provided with apertures (3'"'"', 3a'"'"') corresponding to the inlet apertures (3, 3a) of the housing (12).

8. A reference junction for thermocouple measuring in accordance with claim 6, wherein said housing (12) encases the references temperature blocks (5), said housing being provided with apertures (3, 3a) aligned with the contact surfaces (4) of the temperature reference blocks (5) for the inlet of the thermocouple conductors, characterized in that the retention block (1) is adapted to close the inlet apertures when no thermocouple conductors are connected to the reference junction.

9. A reference junction for thermocouple measuring in accordance with claim 8, characterized in that the retention block (1) comprises a portion adapted to slide between the reference temperature blocks (5) and the housing (12) and is provided with apertures (3'"'"', 3a'"'"') corresponding to the inlet apertures (3, 3a) of the housing (12).

10. A reference junction for thermocouple measuring in accordance with claim 3, characterized in that the retention block (1) comprises a portion adapted to slide between the reference temperature blocks (5) and the housing (12) and is provided with apertures (3'"'"', 3a'"'"') corresponding to the inlet apertures (3, 3a) of the housing (12).

11. A reference junction for thermocouple measuring in accordance with claim 1, wherein said housing (12) encases the reference temperature blocks (5), said housing being provided with apertures (3, 3a) aligned with the contact surfaces (4) of the temperature reference blocks (5) for the inlet of the thermocouple conductors, characterized in that the retention block (1) is adapted to close the inlet apertures when no thermocouple conductors are connected to the reference junction.

12. A reference junction for thermocouple measuring in accordance with claim 11, characterized in that the retention block (1) comprises a portion adapted to slide between the reference temperature blocks (5) and the housing (12) and is provided with apertures (3'"'"', 3a'"'"') corresponding to the inlet apertures (3, 3a) of the housing (12).

13. A reference junction for thermocouple measuring in accordance with claim 1, characterized in that the retention block (1) is spring-biased by means of two springs (6) located opposite the respective contact surface (4) of the reference temperature block (5) in each case.

14. A reference junction for thermocouple measuring in accordance with claim 13 wherein said housing (12) encases the reference temperature blocks (5), said housing being provided with apertures (3, 3a) aligned with the contact surfaces (4) of the temperature references blocks (5) for the inlet of the thermocouple conductors, characterized in that the retention block 91) is adapted to close the inlet apertures when no thermocouple conductors are connected to the reference junction.

15. A reference junction for thermocouple measuring in accordance with claim 14, characterized in that the retention block (1) comprises a portion adapted to slide between the reference temperature blocks (5) and the housing (12) and is provided with apertures (3'"'"', 3a'"'"') corresponding to the inlet apertures (3, 3a) of the housing (12).

16. A reference junction for thermocouple measuring in accordance with claim 13, characterized in that the retention block (1) comprises a portion adapted to slide between the reference temperature blocks (5) and the housing (12) and is provided with apertures (3a, 3a'"'"') corresponding to the inlet apertures (3, 3a) of the housing (12).