GB790631A - Improvements in or relating to thermocouple instruments - Google Patents
Improvements in or relating to thermocouple instrumentsInfo
- Publication number
- GB790631A GB790631A GB3614954A GB3614954A GB790631A GB 790631 A GB790631 A GB 790631A GB 3614954 A GB3614954 A GB 3614954A GB 3614954 A GB3614954 A GB 3614954A GB 790631 A GB790631 A GB 790631A
- Authority
- GB
- United Kingdom
- Prior art keywords
- thermocouple
- indicator
- resistor
- protective device
- circuit
- 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
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D23/00—Control of temperature
- G05D23/19—Control of temperature characterised by the use of electric means
- G05D23/20—Control of temperature characterised by the use of electric means with sensing elements having variation of electric or magnetic properties with change of temperature
- G05D23/22—Control of temperature characterised by the use of electric means with sensing elements having variation of electric or magnetic properties with change of temperature the sensing element being a thermocouple
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
- Measuring Leads Or Probes (AREA)
Abstract
790,631. Electric indicating systems. KELVIN & HUGHES, Ltd. Jan. 2, 1956 [Dec. 14, 1954], No. 36149/54. Class 40 (1). A thermocouple instrument comprises a thermocouple 10 connected with an indicator circuit 12, a protective device 11 which applies a potential difference across the thermocouple so as to urge the indicator to full-scale reading on breakage of the thermocouple and a compensating device 14 which injects into the indicator circuit a voltage equal and opposite to the voltage developed across the thermocouple by the protective device when the thermocouple is unbroken. The protective device 11 comprises a transformer 15 the secondary of which is connected to a rectifier 16 which through a resistor 17 applies the potential difference to the thermocouple. The compensating device comprises a transformer 25 which through a rectifier 20 and resistor 21 is connected across a variable resistor 22 in the circuit between the thermocouple and the indicator. The rectifier 20 is arranged so that the voltage developed across the part of the resistor 22 in circuit is in opposition to the voltage developed across the indicator 24 by the protective device 11 and hence by adjustment of the resistor 22 the pointer of the indicator 24 can be adjusted to its neutral position. Since the transformers 15 and 25 are connected to the same mains supply balance is maintained irrespective of voltage fluctuations. A single transformer can be used instead of two separate transformers.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB3614954A GB790631A (en) | 1954-12-14 | 1954-12-14 | Improvements in or relating to thermocouple instruments |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB3614954A GB790631A (en) | 1954-12-14 | 1954-12-14 | Improvements in or relating to thermocouple instruments |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB790631A true GB790631A (en) | 1958-02-12 |
Family
ID=10385442
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB3614954A Expired GB790631A (en) | 1954-12-14 | 1954-12-14 | Improvements in or relating to thermocouple instruments |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB790631A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1296823B (en) * | 1962-06-18 | 1969-06-04 | Continental Elektro Ind Ag | Temperature measuring device with a thermocouple and a device for displaying a thermocouple break |
-
1954
- 1954-12-14 GB GB3614954A patent/GB790631A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1296823B (en) * | 1962-06-18 | 1969-06-04 | Continental Elektro Ind Ag | Temperature measuring device with a thermocouple and a device for displaying a thermocouple break |
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