GB1002830A - Instrument supervision - Google Patents

Instrument supervision

Info

Publication number
GB1002830A
GB1002830A GB4086262A GB4086262A GB1002830A GB 1002830 A GB1002830 A GB 1002830A GB 4086262 A GB4086262 A GB 4086262A GB 4086262 A GB4086262 A GB 4086262A GB 1002830 A GB1002830 A GB 1002830A
Authority
GB
United Kingdom
Prior art keywords
dial
cell
light
source
instrument
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
GB4086262A
Inventor
David Robert Duff Taylor
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.)
STANLEY SEALEY INSTR Ltd
Original Assignee
STANLEY SEALEY INSTR 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 STANLEY SEALEY INSTR Ltd filed Critical STANLEY SEALEY INSTR Ltd
Priority to GB4086262A priority Critical patent/GB1002830A/en
Publication of GB1002830A publication Critical patent/GB1002830A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
    • G01D5/26—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light
    • G01D5/32—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light
    • G01D5/34—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Details Of Measuring Devices (AREA)

Abstract

1,002,830. Indicating-apparatus. STANLEY SEALEY INSTRUMENTS Ltd. Jan. 23, 1964 [Oct. 29, 1962], No. 40862/62. Heading G1J. An indicating-instrument has attached to its cover glass a sensing device comprising a photoelectric cell 14 exposed to light reflected from a source 17 by the instrument dial, the cell and source being so located that a change in the illumination of the cell occurs when the indicating pointer reaches or leaves a predetermined position, precautions being taken to avoid interference by changes in the ambient illuminition required for the visual observation of the instrument. This can be done by providing a source 17 of light which can be modulated at a convenient frequency and by including a corresponding filter or tuned amplifier in the output circuit of the cell 14. A suitable source 17 would be a small filament lamp fed with alternating current of low enough frequency to cause a marked ripple or a neon lamp. An alternative is to provide two photo-electric cells connected to produce a balanced condition, both cells being exposed to the ambient light, but at least one also being exposed to light reflected from the dial so that when the pointer approaches or departs from the predetermined position the balance is disturbed. One cell may face towards and the other away from the dial or both may face the dial and a low-frequency filter or tuned amplifier may be included in their output circuit. A cylindrical lens 13 may be provided to concentrate light from the lamp 17 on the dial and reflected light from the dial on the cell or cells. The casing 11 may be of polymethylmethacrylate, polyvinylchloride or epoxy resin and it may have a metal casing to screen it from electrical interference, the cable 19 being screened by sleeve 18.
GB4086262A 1962-10-29 1962-10-29 Instrument supervision Expired GB1002830A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB4086262A GB1002830A (en) 1962-10-29 1962-10-29 Instrument supervision

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB4086262A GB1002830A (en) 1962-10-29 1962-10-29 Instrument supervision

Publications (1)

Publication Number Publication Date
GB1002830A true GB1002830A (en) 1965-09-02

Family

ID=10416987

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4086262A Expired GB1002830A (en) 1962-10-29 1962-10-29 Instrument supervision

Country Status (1)

Country Link
GB (1) GB1002830A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2137350A (en) * 1983-03-30 1984-10-03 Boc Group Plc Set-point indicating instruments

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2137350A (en) * 1983-03-30 1984-10-03 Boc Group Plc Set-point indicating instruments

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