| 摘要 |
PURPOSE:To perform switching operation for confirmating the operation in a lump on a receiver side by detecting the polarity of a power source being inverted by a detector side when the polarity inversion is performed on the receiver side, and then controlling an operation pilot lamp into an illumination inhibited state or illumination ready state. CONSTITUTION:A receiver 1 is provided with a power source adjusting means 18 which adjusts the power source and a trepasser detector 4 is provided with an illumination control means 19 which detects the adjustment of the power source by the power source adjusting means 18 and inhibits the operation pilot lamp 15 from illuminating. Therefore, the polarity of the power source is inverted on the receiver side, the detector side detects that and controls the operation pilot lamp into the illumination inhibited state. Consequently, the switching operation for making the operation pilot lamp ready to illuminate for operation confirmation at the time of its installation or periodical inspection and the switching operation for inhibiting the pilot lamp from illuminating after the confirmation are made extremely easy and the operability is improved greatly.
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