Detergent supply control for automatic dishwasher

Details Detergent supply control for automatic dishwasher Detergent supply control for automatic dishwasher

1978-11-27

1980-07-08

Freeh, William L.

Pumps

Condition responsive control of pump drive motor

Having timer or delay means

137 93, 137392, 134 57R, 134103, F04B 4906, F16R 3142, B08B 300

Patent

active

042115175

ABSTRACT:
A commercial-type automatic dishwasher includes a motor-driven circulating pump for recirculating a washing solution, a motor-driven detergent supply pump for adding detergent to the washing solution, and a control system, including control means for operating the circulating pump for a wash cycle of predetermined length, and detergent supply pump control means responsive to the pH level of the washing solution for operating the detergent supply pump as required during the wash cycle to maintain a desired water/detergent ratio. The detergent supply pump control means also includes an adjustable automatic timer which is set for a time interval less than the time of the wash cycle (but long enough to ensure that sufficient detergent can normally be supplied for the length of the wash cycle) which operates in response to a low pH level still existing at the end of the said time interval (indicative of loss of detergent supply) to turn off the detergent supply pump and actuate a warning device which alerts the machine operator to the faulty condition.

REFERENCES:
patent: 3292650 (1966-12-01), Bird et al.
patent: 3339578 (1967-09-01), Smith
patent: 3802447 (1974-04-01), Bender
patent: 4159632 (1979-07-01), Grantham

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