Multiple protocol multiple pump liquid chemical dispenser

A liquid chemical dispensing system for dispensing a plurality of liquid chemicals into a conveyor dishwasher having a wash water tank, wherein said dishwasher is configured to spray rinse water on dishware and to route used rinse water into said dishwasher's wash water tank, the liquid chemical dispensing system comprising:

• a plurality of chemical dispensers, including a detergent dispenser that dispenses detergent into the wash water tank in said dishwasher and a rinse agent dispenser that dispenses rinse agent into a rinse water line in said dishwasher;
• a controller having a programmed digital data processor for running said plurality of dispensers;
• and
• an electronic non-volatile memory;
• said controller coupled to said non-volatile memory and including a digital processor programmed to:
• detect when said dishwasher is spraying rinse water;
• run said rinse agent dispenser whenever said dishwasher is spraying rinse water;
• generate and periodically increment a rinse run time value so long as said dishwasher continues to spray rinse water such that said rinse run time value is indicative of how long said dishwasher has been spraying rinse water;
• store in said electronic non-volatile memory said rinse run time value each time said dishwasher stops spraying rinse water;
• retrieve from said non-volatile memory, each time said dishwasher begins to spray rinse water, said rinse run time value stored therein, and then resume periodically incrementing said rinse run time value;
• and
• run said detergent dispenser at times determined in accordance with said rinse run time value such that said detergent dispenser is running a portion of the time that said dishwasher sprays rinse water and is otherwise turned off, wherein said portion is determined by a detergent run time parameter stored by said controller;
• whereby detergent is dispensed into said dishwasher's wash water tank in amounts corresponding to the amount of time that said dishwasher sprays rinse water.

A liquid chemical dispensing system for dispensing a plurality of liquid chemicals into a conveyor dishwasher having a wash water tank, wherein said dishwasher is configured to route used rinse water into said dishwasher's wash water tank, the liquid chemical dispensing system comprising:

• a plurality of dispensers, including a detergent dispenser that dispenses detergent into the wash water tank in said dishwasher and a rinse agent dispenser that dispenses rinse agent into a rinse water line in said dishwasher;
• a controller having a programmed digital data processor for running said plurality of dispensers;
• and
• an electronic non-volatile memory;
• said controller coupled to said non-volatile memory and including a digital processor programmed to:
• detect when said dishwasher is spraying rinse water;
• generate and periodically increment a rinse run time value so long as said dishwasher continues to spray rinse water such that said rinse run time value is indicative of how long said dishwasher has been spraying rinse water;
• each time said dishwasher begins to spray rinse water, resume periodically incrementing said rinse run time value;
• and
• running said detergent dispenser at times determined in accordance with said rinse run time value so that said detergent dispenser is running a portion of the time that said dishwasher sprays rinse water and is otherwise turned off, wherein said portion is determined by a detergent run time parameter stored by said controller;
• whereby detergent is dispensed into said dishwasher's wash water tank in amounts corresponding to the amount of time that said dishwasher sprays rinse water.

A liquid chemical dispensing system for dispensing a plurality of liquid chemicals into a door dishwasher having a wash water tank and at least one dispenser, wherein said dishwasher is configured to route used rinse water into said dishwasher's wash water tank, the liquid chemical dispensing system comprising:

• at least one dispenser, including a detergent dispenser that dispenses detergent into said wash water tank in said dishwasher,
• a controller having a programmed digital data processor for running said at least one dispenser, wherein said digital data processor is programmed to:
• establish a first detergent run time parameter;
• detect when said dishwasher is spraying rinse water;
• initialize a rinse run time value whenever said dishwasher begins to spray rinse water, and periodically increment said rinse run time value so long as said dishwasher continues to spray rinse water such that said rinse run time value is indicative of how long said dishwasher has been spraying rinse water;
• each time said dishwasher begins to spray rinse water, run said detergent dispenser a length of time corresponding to said first detergent run time parameter;
• and
• detect when said rinse run time value exceeds a threshold value, and then run said detergent dispenser so as to dispense additional detergent into said dishwasher;
• wherein said threshold value is set so that said rinse run time value exceeds said threshold value only when said wash water tank is being refilled;
• whereby said wash water tank is automatically recharged with detergent whenever said wash water tank is refilled.