HP INCFollow


Some printers use an ink pressure sensor (PIP), that compares the ink pressure to the air

pressure of the Air Pressure System (APS), to control the Ink Delivery System, such as detecting

when the Intermediate Tank is full during a refilling process and stopping the ink pump.

Although the PIP sensor is calibrated (Gain and Offset) before its installation into the printer,

the Offset suffers a drift during the normal usage of the printer. The recalibration of the Offset

is done by comparing the PIP signal with the theoretical ink pressure at a well‐known point.

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