APPARATUS FOR COUNTING NUMBER OF PEOPLE IN ZONE TO BE CONTROLLED Russian patent published in 1994 - IPC

FIELD: explosion works. SUBSTANCE: apparatus counts a number of people, being in a zone to be controlled. In order to provide that photoelectric pickups are placed at all inlets and outlets of the zone. Outputs of the pickups are connected with inputs of a reversible counter for counting a number of people in the zone, being controlled, through an analyzer of a passage direction, intermediate memory units and scanning units. The apparatus is provided by a control board of explosion works operator for switching on guard members of the damage zone and for forming orders, providing formation of announce sound signals. A locking unit for locking explosion closes an electric circuit only after forming a warning signals at a predetermined time period after all people had left the zone. EFFECT: enlarged functional possibilities. 7 cl, 5 dwg