GB1466573A - Control circuits - Google Patents

Control circuits

Info

Publication number
GB1466573A
GB1466573A GB1036574A GB1036574A GB1466573A GB 1466573 A GB1466573 A GB 1466573A GB 1036574 A GB1036574 A GB 1036574A GB 1036574 A GB1036574 A GB 1036574A GB 1466573 A GB1466573 A GB 1466573A
Authority
GB
United Kingdom
Prior art keywords
integrator
supply
control
operates
relay
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
GB1036574A
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.)
Logetronics Inc
Original Assignee
Logetronics Inc
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 Logetronics Inc filed Critical Logetronics Inc
Priority to GB1036574A priority Critical patent/GB1466573A/en
Publication of GB1466573A publication Critical patent/GB1466573A/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
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03D—APPARATUS FOR PROCESSING EXPOSED PHOTOGRAPHIC MATERIALS; ACCESSORIES THEREFOR
    • G03D3/00—Liquid processing apparatus involving immersion; Washing apparatus involving immersion
    • G03D3/02—Details of liquid circulation
    • G03D3/06—Liquid supply; Liquid circulation outside tanks
    • G03D3/065—Liquid supply; Liquid circulation outside tanks replenishment or recovery apparatus

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Automation & Control Theory (AREA)
  • Photographic Processing Devices Using Wet Methods (AREA)

Abstract

1466573 Automatic control of film processing chemicals LOGETRONICS Inc 7 March 1974 10365/74 Heading G3N A film processor includes a control circuit for controlling the supply of fresh developer to the processor in accordance with the total area of image processed and its density. In the apparatus shown in Fig. 1 a photo-electric arrangement senses the area and density of black on the film as it passes from the wash tank to the drier and an integrator in the control circuit integrates this signal either until it reaches a predetermined level or for a given time and the valve 1 is opened to supply fresh chemical to the developer tank. The circuit shown in Fig. 4 allows the sensor signal to be integrated for a time determined by timer 22 and then the control relay 24 operates to additionally connect the reference supply 25 to the integrator which causes the integrator output to fall until the outputs of level detectors 16, 20 are the same so relay 18 operates to short circuit the integrating capacitor which zeroes the integrator and resets the system. The control relay 24 also operates contacts 28 to operate valve 1 controlling the supply of fresh chemical. In the operation of this control circuit the control relay will be closed for a time which depends on the level of integrator output when the set time expires and is extended when there is a sensed signal present.
GB1036574A 1974-03-07 1974-03-07 Control circuits Expired GB1466573A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1036574A GB1466573A (en) 1974-03-07 1974-03-07 Control circuits

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1036574A GB1466573A (en) 1974-03-07 1974-03-07 Control circuits

Publications (1)

Publication Number Publication Date
GB1466573A true GB1466573A (en) 1977-03-09

Family

ID=9966507

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1036574A Expired GB1466573A (en) 1974-03-07 1974-03-07 Control circuits

Country Status (1)

Country Link
GB (1) GB1466573A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3221365C1 (en) * 1982-06-05 1983-12-22 Chemie Und Filter Gmbh, Verfahrenstechnik Kg, 6900 Heidelberg Device for regulating a size by feeding an additive into a medium

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3221365C1 (en) * 1982-06-05 1983-12-22 Chemie Und Filter Gmbh, Verfahrenstechnik Kg, 6900 Heidelberg Device for regulating a size by feeding an additive into a medium

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Legal Events

Date Code Title Description
PS Patent sealed