GB261116A - Improvements in and relating to sensitive electrical regulating or indicating devices - Google Patents
Improvements in and relating to sensitive electrical regulating or indicating devicesInfo
- Publication number
- GB261116A GB261116A GB2079625A GB2079625A GB261116A GB 261116 A GB261116 A GB 261116A GB 2079625 A GB2079625 A GB 2079625A GB 2079625 A GB2079625 A GB 2079625A GB 261116 A GB261116 A GB 261116A
- Authority
- GB
- United Kingdom
- Prior art keywords
- thermocouple
- current
- resistance
- pointer
- alarm
- 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
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
- G01K7/02—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 Temperature Or Quantity Of Heat (AREA)
- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
- Connection Of Batteries Or Terminals (AREA)
Abstract
261,116. Foster, C. E. Aug. 19, 1925. Pyrometers.-An electrical regulating or indicating device employing a thermocouple is provided with means for operating an alarm and/or control automatically on failure of the thermocouple. The thermocouple 1, 2 has its hot junction at 3 and its cold junctions at 4, 5, and is connected to a milli voltmeter comprising an adjusting resistance 8, control springs 9, 10 and moving coil 11. The junction 3 is subjected to heat from an electric furnace, and the temperature is indicated by a pointer such as 16. The pointer is periodically depressed by a presser bar carrying a contact 19 so as to complete a circuit at a predetermined temperature and actuate an alarm and/or automatic control. To provide for breakage or failure of the thermocouple, an additional circuit comprising a battery 15 and resistance 14 is connected at 4, 5. The. resistance 14 is relatively high compared with all other resistances, and the current from the battery only affects slightly the zero setting of the voltmeter, and most of this current passes through the low resistance 1, 3, 2. If the thermocouple breaks, the whole current from the battery is diverted through the millivoltmeter, causing an increased deflection of the pointer and completion of a circuit through contact 21, which actuates an alarm and/or reduces or cuts off the current to the furnace.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB2079625A GB261116A (en) | 1925-08-19 | 1925-08-19 | Improvements in and relating to sensitive electrical regulating or indicating devices |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB2079625A GB261116A (en) | 1925-08-19 | 1925-08-19 | Improvements in and relating to sensitive electrical regulating or indicating devices |
Publications (1)
Publication Number | Publication Date |
---|---|
GB261116A true GB261116A (en) | 1926-11-18 |
Family
ID=10151798
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB2079625A Expired GB261116A (en) | 1925-08-19 | 1925-08-19 | Improvements in and relating to sensitive electrical regulating or indicating devices |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB261116A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2011156186A1 (en) * | 2010-06-07 | 2011-12-15 | Rosemount Inc. | Process variable transmitter with thermocouple polarity detection |
-
1925
- 1925-08-19 GB GB2079625A patent/GB261116A/en not_active Expired
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2011156186A1 (en) * | 2010-06-07 | 2011-12-15 | Rosemount Inc. | Process variable transmitter with thermocouple polarity detection |
JP2013528290A (en) * | 2010-06-07 | 2013-07-08 | ローズマウント インコーポレイテッド | Process variable transmitter with thermocouple polarity detection |
RU2521746C1 (en) * | 2010-06-07 | 2014-07-10 | Роузмаунт Инк. | Transmitter of process parameters with determination of polarity of thermocouple |
US8864378B2 (en) | 2010-06-07 | 2014-10-21 | Rosemount Inc. | Process variable transmitter with thermocouple polarity detection |
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