Liquid developing material replenishment system and method

摘要

The liquid developing apparatus comprises a reservoir for providing a supply of operative liquid developing material and being coupled to a liquid developing material supply so as to be replenished. A predetermined amount of operative liquid developing material is periodically discharged from the reservoir to remove contaminated liquid developing material from it upon detection of an unacceptable level of contamination in said supply of liquid developing material. A predetermined amount of liquid developing material concentrate is systematically dispensed from the liquid developing material supply to the reservoir so as to extend the useful life of the operative liquid developing material within it. A multi-wavelength light attenuation sensing device detects a colour shift in the supply of operative liquid developing material for control of the discharger and the dispenser.