GB1222379A – Temperature sensitive bridge circuits and probes therefor
– Google Patents
GB1222379A – Temperature sensitive bridge circuits and probes therefor
– Google Patents
Temperature sensitive bridge circuits and probes therefor
Info
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
1967-09-25
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
Application number
GB4360467A
Inventor
Neville Ryland Davis
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.)
Individual
Original Assignee
Individual
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.)
1967-09-25
Filing date
1967-09-25
Publication date
1971-02-10
1967-09-25
Application filed by Individual
filed
Critical
Individual
1967-09-25
Priority to GB4360467A
priority
Critical
patent/GB1222379A/en
1968-09-20
Priority to DE19681798286
priority
patent/DE1798286A1/en
1968-09-24
Priority to FR1594596D
priority
patent/FR1594596A/fr
1971-02-10
Publication of GB1222379A
publication
Critical
patent/GB1222379A/en
Status
Expired
legal-status
Critical
Current
Links
Espacenet
Global Dossier
Discuss
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
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.
GB4360467A
1967-09-25
1967-09-25
Temperature sensitive bridge circuits and probes therefor
Expired
GB1222379A
(en)
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)
* Cited by examiner, † Cited by third party
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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