b. The wash water temperature is controlled by a mixing valve, which mixes the
hot and cold water. A thermometer gauge is located between the mixing valve and the
wash tank near the mixing valve. Usually a shutoff valve is located between the
thermometer and the mixing valve so that readjustment of the mixing valve is not
necessary each time the water flow is shut off.
To dry the film, there is a heater to heat the air and a blower to move the air.
There must be a good exhaust system to remove the warm, moist air so that only hot,
dry air is directed over the films as they move through the roller-transport system.
There are holes at the ends and slits along the sides of the air tubes to direct the air
onto the films.
a. The chemical components are discussed in detail in lesson 1, section III, of
this subcourse. The manufacturer will supply instructions covering the sequence for
mixing, solution strengths, and temperatures to be used. The chemical components
used are usually identified as part A and part B; in some cases, they will be called parts
A, B, and C. The last part in a given series (B or C) contains bromides; it will be used in
basic solutions but not in replenisher.
b. Contamination of solutions is always a problem. The solutions are separated
into individual stainless steel containers similar to those used in manual processing.
The movement of film from one tank to another is accomplished by means of
crossovers. Tanks will require periodic cleaning to maintain processing quality.
In order to operate the processor, there must be a source of electricity. The
processor itself has a very complex electrical system. Because of the complexity of this
system's wiring and circuitry, it will not be discussed in this subcourse. However, the
operator should be aware of some very general considerations. The processor will
have a circuit breaker and will be properly grounded. Since the various systems are
wired and controlled separately, there are separate switches for the main drive motor
and for the air-dryer, circulation, tempering, and replenisher systems. The operator
should be familiar with the sequence of the switches and fuses for each of the systems.
3-10. OPERATION OF THE AUTOMATIC PROCESSOR
Open wash water and replenisher tank valves.
Turn on all switches.