OPERATION CONDITION MONITOR DEVICE FOR INSTALLATION

摘要

PURPOSE:To easily monitor an operation condition of an installation externally without requiring a special wiring by mounting an adapter having a photodetecting element on a display lamp, and knowing the operation condition of the installation transmitted from the display lamp through the photodetective element. CONSTITUTION:A display lamp L displaying an operation condition of an installation has an adapter mounted to which a photodetective element is attached. An under mentioned circuit is incorporated in the adapter, and a display device 11 displaying the operation condition is disposed. Said circuit detects the light from the display lamp L by a photoamplifier circuit 1 to display the operation condition. A signal detected by said circuit 1 is converted to a pulse corresponding to an on-off. The pulse is taken into a counter circuit 4 through a gate circuit 3 to count a time duration of a pulse signal. The counted value is supplied to a voltage level converting circuit 6 through the gate circuit 3 to match the voltage level and thereafter to display the counted value on a stop watch 11 and know the operation condition.