MIL-HDBK-740
APPLICATION: This system is designded to control the concentration of the wash solu- tion in dishwasherwhich use powdered compounds directly from the shipper.
PRINCIPLE 0f OPERATION: The electrode in the wash tank measures the strenth of the wash solution and transmits the signal to the head. If the concentration is low, power is supplied to the solenoid valve causing it to open and admit hot water into the detergent shipper. The concentrated solution contained in the detergent shipper is fed
into the wash tank thus building up the solution strength. When the
solution strength again falls below the predetermined level, the solenoid valve is again opened to correct the depletion.
In operation, the translucent white head cabinet is illuminated by pilot lamps according to three pre-determined patterns:
1. Cabinet illuminated by steady white light-head is on.
2. Cabinet illuminated by white light and green light--solution is slightly below operating level and the head is feeding
compound.
3. Cabinet illuminated by white light, green light, and red light along with simultaneous buzzer operation--wash solution strength is less than 75% of operating level and, therefore,compound
is either needed in reservoir or wash solution strength is low
for some reason.
Figure 45 - Liquid System (Proximate Type)
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