An anesthesia system (1) is provided with an anesthesia apparatus (2), at least one anesthetic dispenser (3) and at least one parameter detection device (7) for detecting at least one parameter of the at least one anesthetic dispenser (3) at the anesthesia apparatus (2). The parameter detection device (7) is provided with an apparatus interface unit (10) with at least one camera (17) at the anesthesia apparatus (2) and with a dispenser interface unit (11) with at least one image pattern (16) at the at least one anesthetic dispenser (3). The at least one image pattern (16) can be detected by the camera (17), and the dispenser interface unit (11) is a passive dispenser interface unit (11).