A liquid consuming apparatus comprising: a detachably mountable liquid cartridge comprising: a first liquid chamber storing liquid therein, wherein the liquid has a first specific gravity; a second liquid chamber configured to store the liquid therein; a communication path through which the liquid can flow selectively from the first liquid chamber to the second liquid chamber; a liquid supply portion configured to supply the liquid from the first liquid chamber and the second liquid chamber to an exterior of the liquid cartridge; a blocking member configured to selectively block communication between the first liquid chamber and the second liquid chamber through the communication path, such that the liquid is selectively prevented from flowing from the first liquid chamber to the second liquid chamber through the communication path; and a first movable member positioned in the second liquid chamber and comprising a detection portion and a float, wherein the float has a second specific gravity which is less than the first specific gravity; a cartridge mounting portion configured to receive the liquid cartridge; a liquid consuming portion configured to consume the liquid supplied via the liquid supply portion from the liquid cartridge mounted to the cartridge mounting portion; a contact member provided at the cartridge mounting portion and configured to, when inserting the liquid cartridge, contact and move a portion of the liquid cartridge being mounted to the liquid cartridge mounting portion for bringing the first liquid chamber and the second liquid chamber into communication with each other through the communication path; a mount detector positioned in a mount detection position in an insertion path of the liquid cartridge into the cartridge mounting portion and configured to selectively output a first signal when the liquid cartridge is not in the mount detection position and a second signal when the liquid cartridge is in the mount detection position; a detector configured to selectively output a third signal when the detection portion is not in a detection position and a fourth signal when the detection portion is in the detection position; and a controller configured to: measure a transit time from when the signal output from the mount detector changes from the first signal to the second signal to when the signal output from the detector changes from one of the third signal and the fourth signal to the other of the third signal and the fourth signal; and determine whether the transit time is within a threshold range. a first liquid chamber storing liquid therein, wherein the liquid has a first specific gravity; a second liquid chamber configured to store the liquid therein; a communication path through which the liquid can flow selectively from the first liquid chamber to the second liquid chamber; a liquid supply portion configured to supply the liquid from the first liquid chamber and the second liquid chamber to an exterior of the liquid cartridge; a blocking member configured to selectively block communication between the first liquid chamber and the second liquid chamber through the communication path, such that the liquid is selectively prevented from flowing from the first liquid chamber to the second liquid chamber through the communication path; and a first movable member positioned in the second liquid chamber and comprising a detection portion and a float, wherein the float has a second specific gravity which is less than the first specific gravity; a cartridge mounting portion configured to receive the liquid cartridge; a liquid consuming portion configured to consume the liquid supplied via the liquid supply portion from the liquid cartridge mounted to the cartridge mounting portion; a contact member provided at the cartridge mounting portion and configured to, when inserting the liquid cartridge, contact and move a portion of the liquid cartridge being mounted to the liquid cartridge mounting portion for bringing the first liquid chamber and the second liquid chamber into communication with each other through the communication path; a mount detector positioned in a mount detection position in an insertion path of the liquid cartridge into the cartridge mounting portion and configured to selectively output a first signal when the liquid cartridge is not in the mount detection position and a second signal when the liquid cartridge is in the mount detection position; a detector configured to selectively output a third signal when the detection portion is not in a detection position and a fourth signal when the detection portion is in the detection position; and a controller configured to: measure a transit time from when the signal output from the mount detector changes from the first signal to the second signal to when the signal output from the detector changes from one of the third signal and the fourth signal to the other of the third signal and the fourth signal; and determine whether the transit time is within a threshold range. measure a transit time from when the signal output from the mount detector changes from the first signal to the second signal to when the signal output from the detector changes from one of the third signal and the fourth signal to the other of the third signal and the fourth signal; and determine whether the transit time is within a threshold range.