Device for interfacing between a film developing device and silv

Details Device for interfacing between a film developing device and silv Device for interfacing between a film developing device and silv

1996-03-15

1997-11-18

Rutledge, D.

Photography

Fluid-treating apparatus

Having testing, calibration, or indicating

396626, 204273, G03D 302

Patent

active

056897472

ABSTRACT:
Interface for a silver recovery unit (11) for indicating the operating condition of at least one pump (9a, 9b). A sensor (10) for detection of the operating condition of the pump (9a, 9b) is installed outside the at least one pump (9a, 9b) such that during installation an intervention in the electronic unit (24) of the pump (9a, 9b) or in the pump (9a, 9b) itself is avoidable. The output signal of the sensor (10) is passed to a series-connected electronic circuit (400) that comprises a series connection of an amplifying means (40), a first filtering means (41), a rectifying means (42), a second filtering means (43) and a comparator (44).

REFERENCES:
patent: 4302317 (1981-11-01), Mock
patent: 5133846 (1992-07-01), De Niel et al.
patent: 5203979 (1993-04-01), Uffinger et al.

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