In some examples, a fluid-ejection device can include a fluidic tube to fluidically connect to a fluid supply, a carriage having a fluidic interconnector fluidically connectable to the fluidic tube and movable between a first position and a second position, a receiver to receive an air purger, wherein the air purger, when present, is coupled to the receiver and fluidically connectable to the fluidic interconnector, and a controller to cause the carriage to actuate from the first position to the second position, determine a location of the carriage at the second position, and based on the location of the carriage at the second position, detect a status of the air purger, a status of an engageable lock in the air purger, or both.