Self-adhesive moisture alarm instrument - has internal buzzer operating if projecting electrodes are connected by moist surface

摘要

A self-adhesive moisture warning device, which can be used e.g. as an overflow or level indicator for any water container, an alam for bedwetters, a leakage alarm for a washing machine etc. The instrument consists of an electrical unit of small dimensions with a rubber suction cap for attachment to any surface, and with a pair of electrodes projecting downwards. If the two electrodes become connected by a moist surface, a circuit is completed and an internal battery and transistor circuit actuates a warning buzzer.