Automatic replenisher system for a film processing tank

Details Automatic replenisher system for a film processing tank Automatic replenisher system for a film processing tank

G - Physics

03

D

95/91

G03D 13/00 (2006.01) G03D 3/06 (2006.01)

Patent

CA 1058935

AUTOMATIC REPLENISHER SYSTEM FOR A FILM PROCESSING TANK ABSTRACT An automatic replenishing system for maintaining the chemical concentration of the liquid in a film processing tank, which automatically energizes a replenishing pump at regular timed intervals (e.g. every 30 seconds) regardless of whether or not the control circuitry indicates a need for replenishment, and which includes means for sending the density and velocity of the film and for producing a com- bined signal which controls the running time of the pump after each energization. The replenishing system also in- cludes a second replenishing pump for maintaining the con- dition of the liquid in the processing tank, which second pump is energized automatically after a predetermined number of said regular timed intervals, or after a predetermined number of said regular timed intervals in which a zero film density or non-use condition has been detected for a pre- set running time.

242657

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