GB1222379A - Temperature sensitive bridge circuits and probes therefor - Google Patents
Temperature sensitive bridge circuits and probes thereforInfo
- Publication number
- GB1222379A GB1222379A GB4360467A GB4360467A GB1222379A GB 1222379 A GB1222379 A GB 1222379A GB 4360467 A GB4360467 A GB 4360467A GB 4360467 A GB4360467 A GB 4360467A GB 1222379 A GB1222379 A GB 1222379A
- Authority
- GB
- United Kingdom
- Prior art keywords
- thermistor
- bridge
- temperature
- potentiometer
- resistor
- 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
- G01K7/16—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements
- G01K7/22—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements the element being a non-linear resistance, e.g. thermistor
- G01K7/24—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements the element being a non-linear resistance, e.g. thermistor in a specially-adapted circuit, e.g. bridge circuit
- G01K7/25—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements the element being a non-linear resistance, e.g. thermistor in a specially-adapted circuit, e.g. bridge circuit for modifying the output characteristic, e.g. linearising
Landscapes
- Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- General Physics & Mathematics (AREA)
- Measurement Of Resistance Or Impedance (AREA)
- Measuring Temperature Or Quantity Of Heat (AREA)
- Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)
Abstract
1,222,379. Measuring temperature, electrically. N.R. DAVIS. Sept. 24, 1968 [Sept. 25, 1967], No. 43604/67. Heading G1U. [Also in Division G3] In a resistance bridge circuit for measuring temperature, a thermistor T having an exponential characteristic and a resistor R having a resistance equal to the resistance of the thermistor at a temperature midway in the range of operation are connected to form electrically adjacent arms of the bridge, the other two arms being so arranged that the sum of their resistances is constant, whereby any unbalance of the bridge measured across the diagonal between the junction of the thermistor and resistor R and the junction between the other two arms is linearly related to the temperature of the thermistor. Inthearrangement shown in Fig. 5, a high resistance meter I can be connected across said diagonal by pushbutton PBI to indicate the bridge unbalance and can be connected across potentiometer VR by push-button PBC for calibration purposes. The output from a long tailed pair differential amplifier T1, T2 switches transistor T3 on to energize a relay RL to control a heater (not shown) when the bridge unbalance exceeds a given amount. The particular temperature at which control is effected is adjustable, using potentiometer VR. In an alternative arrangement Fig. 1 (not shown), said diagonal includes a high impedance voltmeter (G) connected to the wiper of the potentiometer (VR) which in use is adjusted to balance the bridge and is calibrated linearly in temperature. A second meter may be connected in parallel in said diagonal to a respective independent wiper of the potentiometer for indicating bridge unbalance. Alternatively two bridge circuits may be provided, the resistor R and thermistor T being common to both. Temperature probes. The resistor R may be mounted physically adjacent the thermistor T within a probe P or in the connector leads of the probe or in a plug or socket by which the probe is connectable to the remainder of the circuit. A small additional resistance (T) may be connected in series with the thermistor. Resistors R and (r) may be adjustable, or merely selected, to give the required temperature range.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB4360467A GB1222379A (en) | 1967-09-25 | 1967-09-25 | Temperature sensitive bridge circuits and probes therefor |
| DE19681798286 DE1798286A1 (en) | 1967-09-25 | 1968-09-20 | Bridge circuit |
| FR1594596D FR1594596A (en) | 1967-09-25 | 1968-09-24 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB4360467A GB1222379A (en) | 1967-09-25 | 1967-09-25 | Temperature sensitive bridge circuits and probes therefor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1222379A true GB1222379A (en) | 1971-02-10 |
Family
ID=10429498
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB4360467A Expired GB1222379A (en) | 1967-09-25 | 1967-09-25 | Temperature sensitive bridge circuits and probes therefor |
Country Status (3)
| Country | Link |
|---|---|
| DE (1) | DE1798286A1 (en) |
| FR (1) | FR1594596A (en) |
| GB (1) | GB1222379A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104344912A (en) * | 2014-12-05 | 2015-02-11 | 成都艾塔科技有限公司 | Simple overtemperature alarm |
-
1967
- 1967-09-25 GB GB4360467A patent/GB1222379A/en not_active Expired
-
1968
- 1968-09-20 DE DE19681798286 patent/DE1798286A1/en active Pending
- 1968-09-24 FR FR1594596D patent/FR1594596A/fr not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| DE1798286A1 (en) | 1972-04-20 |
| FR1594596A (en) | 1970-06-08 |
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