Patent ID: 8210629

Claim:
A method of determining a status of a micro-fluidic ejection device, comprising: selecting a jetting frequency of the micro-fluidic ejection device having a steady state temperature when operated at the selected jetting frequency; heating the micro-fluidic ejection device to the steady state temperature; jetting a fluid from the micro-fluidic ejection device with a burst at the selected frequency; measuring the temperature change in the micro-fluidic ejection device as a result of the jetting burst; and determining a flow rate of the fluid though the micro-fluidic ejection device from the change in temperature as a result of the jetting burst, wherein if the measure temperature dictates that fluid remains in the micro-fluidic ejection device, the determined flow rate is a first flow rate adjusted to jet less than all available nozzles of the micro-fluidic ejection device or is a second flow rate lower than the first flow rate jetting all said available nozzles of the micro-fluidic ejection device.