GB796874A - Improvements in or relating to electrical measuring apparatus - Google Patents

Improvements in or relating to electrical measuring apparatus

Info

Publication number
GB796874A
GB796874A GB3585454A GB3585454A GB796874A GB 796874 A GB796874 A GB 796874A GB 3585454 A GB3585454 A GB 3585454A GB 3585454 A GB3585454 A GB 3585454A GB 796874 A GB796874 A GB 796874A
Authority
GB
United Kingdom
Prior art keywords
thermocouples
alarm
switch
indicator
magnitude
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
GB3585454A
Inventor
Francis Greenshields
John Edwin Ridley
Eric James Boiling
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.)
METROPOLITAN WATER BOARD
Original Assignee
METROPOLITAN WATER BOARD
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 METROPOLITAN WATER BOARD filed Critical METROPOLITAN WATER BOARD
Priority to GB3585454A priority Critical patent/GB796874A/en
Publication of GB796874A publication Critical patent/GB796874A/en
Expired legal-status Critical Current

Links

Classifications

    • GPHYSICS
    • G01MEASURING; TESTING
    • G01KMEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K7/00Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
    • G01K7/02Measuring 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
    • G01K7/021Particular circuit arrangements

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Investigating Or Analyzing Materials Using Thermal Means (AREA)

Abstract

796,874. Voltage measurement. METROPOLITAN WATER BOARD. Dec. 12, 1955 [Dec. 10, 1954], No. 35854/54. Class 37. [Also in Groups XXXVIII and XL (b)] Apparatus for measuring the magnitude and polarity of D.C. signals as a measure of physical variables and derived from, e.g., thermocouples and photo-cells comprises a converter producing an A.C. corresponding in magnitude and phase sense to the D.C. amplitude and polarity, a motor driven by the A.C. signals to produce a rotary motion dependent thereon in velocity and sense, which drives an indicator disc for stroboscopic observation and a tachometer generator whose output deflects a chopper-bar centre zero galvanometer arranged to close contacts at a predetermined deflection or deflections to operate an alarm circuit. A number of pairs of thermocouples disposed, e.g. at different levels of a water supply reservoir are respectively connected in series opposition to corresponding pairs of contacts 5, 6, &c. of banks 7a, 7b of a rotary selector switch stepped by a magnet energized periodically by circuitbreaker 36 and switch 35 opened and closed by motor-driven cam 34, the arms of which are connected through a converter 11 comprising, e.g., a vibratory switch energizing alternate primary halves of a transformer to produce an A.C., representing in amplitude and phase angle the magnitude and sense of the thermocouple output and thus the temperature difference between the couples. After variable amplification the signal energizes winding 14 of bi-phase motor 15 whose other winding 16 is energized from a quadrature source to drive through gearing 18 an indicator disc 17 stroboscopically observable for speed determination, and a D.C. generator 19 having a linear output/speed characteristic. The latter energizes through variable resistance 20 a centre zero galvanometer 21 having a clock-controlled chopper-bar arrangement 24 effective to periodically close one or more pairs of critically positioned contacts 23 when the needle 21b lies thereupon, and complete an alarm circuit through relay 26 controlling mercury switch 27 to energize a lamp 28, a bell 29, and a control mechanism 30 at a selected value or values of the temperature difference of the thermocouples. The alarm and control circuit operates when the temperature difference is such that a rapid inversion of water levels is likely, and initiates, e.g., chlorination of the outflow to purify stagnant water rising from the lower depths. Bank 7c of the rotary switch selectively energizes lamps 37 to 40 to indicate the appropriate pair of thermocouples in circuit. The D.C. generator output may energize a recording galvanometer or a computer, and the thermocouples may be applied to other process apparatus (e.g. distillation columns and cereal bulk storage) to operate indicator, alarm, and/or control circuits at critical temperature differences. The thermocouples may be replaced by opposedly connected photo-cells illuminated by a prism divided light beam, so as to operate the indicator alarm and/or control circuits on reduction of the intensity of either beam by the interposition of solid, liquid, or gaseous matter.
GB3585454A 1954-12-10 1954-12-10 Improvements in or relating to electrical measuring apparatus Expired GB796874A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB3585454A GB796874A (en) 1954-12-10 1954-12-10 Improvements in or relating to electrical measuring apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3585454A GB796874A (en) 1954-12-10 1954-12-10 Improvements in or relating to electrical measuring apparatus

Publications (1)

Publication Number Publication Date
GB796874A true GB796874A (en) 1958-06-18

Family

ID=10382262

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3585454A Expired GB796874A (en) 1954-12-10 1954-12-10 Improvements in or relating to electrical measuring apparatus

Country Status (1)

Country Link
GB (1) GB796874A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001094846A2 (en) * 2000-06-09 2001-12-13 Dario Felisari Electrothermal device for ignition and flame detection in gas burners

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001094846A2 (en) * 2000-06-09 2001-12-13 Dario Felisari Electrothermal device for ignition and flame detection in gas burners
WO2001094846A3 (en) * 2000-06-09 2002-05-30 Dario Felisari Electrothermal device for ignition and flame detection in gas burners
US7256344B2 (en) * 2000-06-09 2007-08-14 Dario Felisari Electrothermal device for ignition and flame detection in gas burners

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