A sensor web for electric field sensing. A substrate has a longitudinal direction. At least one array of electrically conductive sensor areas follows each other in a successive manner along the longitudinal direction and is arranged on one side of the substrate. A group of conductors is on the same side of the substrate. Each electrically conductive sensor area that is to be used for sensing purposes is electrically connected to one conductor. The conductors are adapted to join one by one the group of the conductors advancing in the longitudinal direction of the substrate and the other conductors of the group are adapted to give space for the joining conductor. A method for manufacturing of a sensor web and a system for monitoring a space.