GB1352998A - Apparatus responsive to a nonelectrical parameter - Google Patents

Apparatus responsive to a nonelectrical parameter

Info

Publication number
GB1352998A
GB1352998A GB4420670A GB1352998DA GB1352998A GB 1352998 A GB1352998 A GB 1352998A GB 4420670 A GB4420670 A GB 4420670A GB 1352998D A GB1352998D A GB 1352998DA GB 1352998 A GB1352998 A GB 1352998A
Authority
GB
United Kingdom
Prior art keywords
impedance
resistor
temperature
thermistor
value
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
Application number
GB4420670A
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.)
Graviner Colnbrook Ltd
Original Assignee
Graviner Colnbrook Ltd
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.)
Filing date
Publication date
Application filed by Graviner Colnbrook Ltd filed Critical Graviner Colnbrook Ltd
Publication of GB1352998A publication Critical patent/GB1352998A/en
Expired legal-status Critical Current

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
    • 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
    • G05D23/1927—Control of temperature characterised by the use of electric means using a plurality of sensors
    • G05D23/1928—Control of temperature characterised by the use of electric means using a plurality of sensors sensing the temperature of one space
    • 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
    • G05D23/24—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 having a resistance varying with temperature, e.g. a thermistor

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Automation & Control Theory (AREA)
  • Nonlinear Science (AREA)
  • Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
  • Investigating Or Analyzing Materials Using Thermal Means (AREA)

Abstract

1352998 Temperature detecting systems GRAVINER (COLNBROOK) Ltd 16 Sept 1971 [16 Sept 1970] 44206/70 Heading G4N [Also in Division G1] Apparatus responsive to the value of a non- electric variable comprises two controllableimpedance devices (such as transistors 18, 20) connected in a series circuit with an impedance 16 responsive to a non-electric variable and arranged so that at one value of the non- electric variable, device 18 will have a high impedance relative to device 20 whereas at another value of the non-electric variable, the relative impedances will be transposed. As described, impedance 16 may be responsive to light, radiation, strain, humidity or temperature. If impedance 16 is a negative temperature coefficient thermistor and resistor 22 has a fixed value, the values of resistors 6, 8, 10 may be selected such that at low temperatures (when thermistor 16 has a high value), transistor 20 has low impedance and transistor 18 high impedance. At high temperatures, the relative impedance of the transistors 18, 20 becomes transposed. Alternatively, resistor 22 may be replaced by a negative temperature-coefficient thermistor having thermal insulation so that the apparatus only responds to rapid changes in temperature. The change in output voltage Vo due to the change in relative impedance of transistors 18, 20 may be monitored by an insulated-gate field effect transistor or gas-filled trigger tube. Alternatively, a fixed upper temperature limit can be detected by connecting a positive temperature-coefficient thermistor in series with resistor 6. In a further modification, thermistor 16 may be replaced by a fixed resistor and resistor 22 by a positive temperaturecoefficient thermistor.
GB4420670A 1970-09-16 1970-09-16 Apparatus responsive to a nonelectrical parameter Expired GB1352998A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB4420670 1970-09-16

Publications (1)

Publication Number Publication Date
GB1352998A true GB1352998A (en) 1974-05-15

Family

ID=10432262

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4420670A Expired GB1352998A (en) 1970-09-16 1970-09-16 Apparatus responsive to a nonelectrical parameter

Country Status (1)

Country Link
GB (1) GB1352998A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2153125A (en) * 1984-01-13 1985-08-14 Atomic Energy Authority Uk Improvements in or relating to apparatus for monitoring gas flow

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2153125A (en) * 1984-01-13 1985-08-14 Atomic Energy Authority Uk Improvements in or relating to apparatus for monitoring gas flow

Similar Documents

Publication Publication Date Title
GB1290164A (en)
GB1254998A (en) Colour pyrometers
US3287975A (en) Temperature indicator
ES535410A0 (en) CIRCUIT ARRANGEMENT WITH MAGNETIC FIELD PERCEIVER TO MEASURE A MAGNETIC FIELD
GB1375389A (en)
GB1352998A (en) Apparatus responsive to a nonelectrical parameter
GB1179337A (en) Improvements in Measuring Bridge Circuits
FR1434144A (en) Thermistor with positive temperature coefficient of resistance
KR900002509A (en) Overvoltage Protection Circuit
GB939052A (en) Temperature control system
GB1235878A (en) Electrical measuring system
JPS57208428A (en) Temperature detecting device
GB1472182A (en) Apparatus for detecting the physical properties of magnetic or electric conductive heat-responsive or deformable material
JPS544052A (en) Transmission circuit of photo coupling analog signal
JPS5531977A (en) Detection element of infrared ray
GB1393527A (en) Radiometer
GB1312122A (en) Protection circuit
EP0039460A3 (en) Electronic clinical thermometer
GB807232A (en) Improvements in and relating to temperature measuring devices
SU201529A1 (en) A method for reducing the temperature error of resistance devices
GB1008473A (en) Improvements in or relating to temperature measurement
SU389417A1 (en)
FR2288279A1 (en) Thermostatic control system - has diode as temp. sensor with negative or positive coefficient platinum resistive element
SU477534A2 (en) Pulse Comparison Device
GB1117814A (en) Improvements in or relating to temperature responsive circuits

Legal Events

Date Code Title Description
PS Patent sealed
732 Registration of transactions, instruments or events in the register (sect. 32/1977)
PE20 Patent expired after termination of 20 years