With the HP 950 and HP 951 cartridges, HP launched a completely new type of cartridge in fall 2011. Four separate ink tanks: a cartridge of unusual size for each colour, each equipped with a chip. They are currently used in HP Officejet Pro 8100 and Pro 8600 printers, but other printers will probably follow.
Both cartridges are available in small size (HP 950 with a capacity of 1,000 pages, and HP 951 with 700 pages) as included in the delivery of the printer, and as replacement cartridges with extra large volume. The extra large HP 950 XL cartridge has a capacity of 2,300 pages, and the HP 951 XL prints up to 1,500 pages.
HP equipped every cartridge with a new chip. The chip does not "measure" the ink level in the HP 950 and HP 951 cartridges, it simply counts the pages printed. When you have printed the number of pages programmed by HP, the chip will signal to the printer that the cartridge is empty and the display of the printer shows the image of an empty cartridge. It is not possible to reset the chip yet. Therefore, you have to deactivate the filling level indicator of your printer as described below.
The inside of the cartridge contains the kind of technology used years ago in HP 29 and HP 49 cartridges. A plastic bag with a spring compensates the pressure difference induced while printing. Our ink refill instructions for HP 950 and HP 951 cartridges show you how to refill these cartridges.