75abd686_HP_8250_printer__Component
[Features] The ink sensor detects when ink in a cartridge is exhausted. [Benefits] The message to “Replace Cartridges Soon” gives timely and accurate information – when it appears, there is no more usable ink in the cartridge. [Component] 
Ink sensor
I n k c a r t r i d g e s
P u m p
I n k s e n s o r
F a c t o r y i n s t a l l e d p r i n t h e a d
V e n t c h a m b e r
I n k s u p p l y s t a t i o n
HP 8250 printer
Component