A dishwashing machine has a cleaning solution circulating pump operating between two different speeds with cycle times dependent on the output of an opacity monitor.

摘要

The pump supplying the spray arms of the dishwasher alternates between 1600 and 2800 rpm for 4 and .5 seconds respectively (3a) and the voltage output from a cleaning fluid opacity sensor (3b) is monitored and reduces the high speed time if the liquid level falls.