Electronic type on delay timer switch and electronic type on delay timer equipped pressure switch

摘要

PURPOSE: To provide a small sized and low cost electronic on-delay timer switch and a pressure switch having the electronic on-delay timer and accumulation type of those. ;CONSTITUTION: A counter circuit 60 starts counting clocks from a clock circuit 64 when the contact the micro-switch of a pressure detector is closed in response to a measured pressure higher than a set value. The counter circuit 60 generates an operation signal to enable a switching circuit 66 to operate so as to reduce its output resistance when the count value reaches a delay time set in a time setting trimmer 62 in advance, thereby the coil of a relay or the like is operated. When the measured value drops under the set value and the contact of the micro-switch is opened before the count value reaches the set delay time, the counter circuit is reset. When the opening and closing of the micro-switch is intermittent, the closing time is accumulated for the determination based on the accumulated time.;COPYRIGHT: (C)1993,JPO&Japio