Attachment for information sign has sensor device for activation of actuator used to provide effect which draws attention to information sign

摘要

The attachment has an actuator (5) for providing an effect, e.g. an optical or acoustic signal, which draws attention to the information sign (1), with a sensor device (10) monitoring a measuring range and providing a sensor signal for activation of the actuator when a given measuring criteria is fulfilled. The actuator and/or the sensor device may be coupled to a time circuit for selective operation during set times.