2X 2 in 1 Pump pour Water Automatic Controller DC12V Liquid Level Sensor Switch Relay Module

Interface Description: HIGH: limit probe OUT: output probe LOW: Lower limit probe DC+: positive power supply DC-: Negative power supply NC: Relay normally closed contact : Relay common contact NO: Relay normally open contact Working principle (automatic water injection tower): The water level rises: when the water level is lower than the low level the water pump starts to supply water to the water tower; when the water level is higher than the high level the water pump stops water supply. The water level : When the water level is lower than the high level the water pump does not work and the water level continues to drop. When the water level is lower than the low water level the water pump starts to supply water to the water tower. Working principle (automatic pumping of water tower): Contrary to automatic filling of water tower Colour: blue Material: plastic Package Contents: 2 x Controller module Only the above package content other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.