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The LP-3 dry run sensor is a reliable and efficient component for automatic water supply systems, irrigation systems, firefighting systems, and air conditioning. It is designed to prevent pump equipment failures due to operation without water (dry run mode). When there is no water in the system, the sensor automatically turns off the pump, ensuring long and safe operation of the equipment. Main characteristics: Voltage (frequency): 220 V (50 Hz). Maximum switched current: 16 A. Operating water temperature range: from 1 to 40 °C. Operating pressure range: from 0.5 to 2.8 bar. Connection size: 1/4 inch. Electrical protection class: IP44. Purpose and principle of operation: The LP-3 dry run sensor is a two-contact relay that operates on the principle of switching electrical circuits depending on the water pressure level in the system. Pressure monitoring: At the first start of the system, to activate the relay, press and hold the button on the device cover. After that, the relay contacts will close. Automatic shutdown at low pressure: When the pressure in the system drops to 0.4-0.05 bar, the relay contacts open, which leads to the pump shutdown, preventing its operation without water and thus reducing the risk of p