GB638073A - Improvements in or relating to apparatus for the control of industrial chemical processes - Google Patents

Improvements in or relating to apparatus for the control of industrial chemical processes

Info

Publication number
GB638073A
GB638073A GB1044747A GB1044747A GB638073A GB 638073 A GB638073 A GB 638073A GB 1044747 A GB1044747 A GB 1044747A GB 1044747 A GB1044747 A GB 1044747A GB 638073 A GB638073 A GB 638073A
Authority
GB
United Kingdom
Prior art keywords
control
cam
potentiometer
linear
voltage
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
GB1044747A
Inventor
William Barrow Bartley
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.)
Marconi Instruments Ltd
Original Assignee
Marconi Instruments 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 Marconi Instruments Ltd filed Critical Marconi Instruments Ltd
Priority to GB1044747A priority Critical patent/GB638073A/en
Publication of GB638073A publication Critical patent/GB638073A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D21/00—Control of chemical or physico-chemical variables, e.g. pH value
    • G05D21/02—Control of chemical or physico-chemical variables, e.g. pH value characterised by the use of electric means

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Automation & Control Theory (AREA)
  • Investigating Or Analysing Biological Materials (AREA)
  • Investigating Or Analysing Materials By The Use Of Chemical Reactions (AREA)

Abstract

638,073. Automatic control systems. MARCONI INSTRUMENTS, Ltd. April 18, 1947, No. 10447. Drawings to Specification. [Class 38 (iv)] [Also in Group XL (c)] The pH value of a reagent is controlled by using the voltage from a pair of electrodes in the reagent for automatic control, or as an indicator for manual control, of an element having a characteristic which compensates for the non-linearity of voltage output with changes in hydrogen ion concentration, so that a substantially linear control of concentration is obtained. The compensating element may be a non-linear thermionic valve amplifier (see Group XL (c)), to which the electrode voltage is applied. In an alternative embodiment, Fig. 5 (not shown), the electrode voltage is measured by a linear potentiometer which carries on the same shaft a cam so shaped that a follower will effect a linear control. In a further embodiment, Figs. 6 and 7 (not shown), the cam is replaced by a second potentiometer having a graded resistance element. The output of this potentiometer is used to effect control. In a still further embodiment, the compensating cam is used to move camactuated switches nearer to, or further from, the axis of a variable dwell actuating cam.
GB1044747A 1947-04-18 1947-04-18 Improvements in or relating to apparatus for the control of industrial chemical processes Expired GB638073A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1044747A GB638073A (en) 1947-04-18 1947-04-18 Improvements in or relating to apparatus for the control of industrial chemical processes

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1044747A GB638073A (en) 1947-04-18 1947-04-18 Improvements in or relating to apparatus for the control of industrial chemical processes

Publications (1)

Publication Number Publication Date
GB638073A true GB638073A (en) 1950-05-31

Family

ID=9968024

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1044747A Expired GB638073A (en) 1947-04-18 1947-04-18 Improvements in or relating to apparatus for the control of industrial chemical processes

Country Status (1)

Country Link
GB (1) GB638073A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1623018B1 (en) * 1964-11-13 1970-12-23 Jungner Instrument Ab Coulometric titration device
US3791793A (en) * 1972-01-31 1974-02-12 Leeds & Northrup Co Adaptive feed forward-feedback control of the concentration of a selected ion of a solution

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1623018B1 (en) * 1964-11-13 1970-12-23 Jungner Instrument Ab Coulometric titration device
US3791793A (en) * 1972-01-31 1974-02-12 Leeds & Northrup Co Adaptive feed forward-feedback control of the concentration of a selected ion of a solution

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