FIELD: transport.
SUBSTANCE: invention relates to determination of the level of consumable paper article (201, 301) in dispenser (103, 106) arranged lavatory. Invention covers several aspects such as dispenser, method, system and sensor unit incorporating two sensor elements (420, 430) each detecting the light reflected from reflecting field located at paper article, or reveals the absence of paper. Data from sensors are transmitted via wireless line to server for further processing, for example, for notification of cleaner who services the lavatory.
EFFECT: perfected design.
25 cl, 10 dwg, 2 tbl
