DEVICE FOR AUTOMATICALLY MONITORING AN INDEPENDENT CURRENT SUPPLY

摘要

of the Invention This invention relates to a device for automatically monitoring the charging state of the independent current supply of the transponder of a network for determining the position of traffic systems, wherein there is coordinated with the current supply (primary batteries or accumulators adapted to be charged via solar cells) a monitoring sensor with a defined response threshold. The humidity of the ambient atmosphere is additionally monitored by providing a sensor inside the device. The sensor indicates any excess of a predetermined limiting value of the humidity inside the transponder which under normal operational conditions is kept at low values. If the humidity sensor detects excess humidity, it produces a signal which is mixed with the monitoring signal via an OR gate and included in a response telegram to be sent to an interrogating unit.