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Abstract Industrial application situation of the high and low water level acousto-optic alarm device in Jinhuagong Mine was introduced, the device could not only send out sound and light alarm in the water level of the upper and lower, but also relatively accurately show the water level of the current situation of water sump to guide open pump time and maintenance time for drivers and repairman. At the same time, the device realized a certain function according to the actual situation of the scene through the changes of the PLC program.
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