Apparatus for monitoring photographic processing liquid

Details Apparatus for monitoring photographic processing liquid Apparatus for monitoring photographic processing liquid

1977-02-22

1978-10-10

Pitts, Harold I.

Communications: electrical

Systems

Timer control

3403094, 354297, 354298, 340168R, G08B 100

Patent

active

041199529

ABSTRACT:
An apparatus for monitoring photographic processing liquid composed of a timer to determine the length of time which has passed after the renewal of the processing liquid, a counter to determine the amount of the photographic film which has been already processed and an alarm light which is responsive to either timer or counter when having reached the respective predetermined position for lighting to indicate that the photographic processing liquid must be renewed. Thanks to the monitoring in terms of the "effective length of time" of the processing liquid and of the total amount of the photographic film already processed, it is assured that the processing liquid is renewed before it has been exhausted and has lost the processing capability.

REFERENCES:
patent: 3780315 (1973-12-01), Blakeslee
patent: 3822723 (1974-07-01), Crowell
patent: 3973251 (1976-08-01), Stephans

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