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LJXH 2 Wires Bottom-mounted Water Temperature Water Level Sensor 3/4 Inch SUS Sensor Probe Suitable for Solar Water Heater Specifications:Product Name: 2 Wires SensorWater Level Wire: RedTemperature Wire: YellowSensor Length: 30cmSignal Cable Length: 50cmConnection Size: 26mm (3/4") Internal ThreadOperating Voltage: 220VMounting Method: Bottom-mountingSensor Material: Stainless SteelPackage Contents: 1 x sensor Notices:1. When the following disasters occur to the instrument, it can be that your sensor is broken) The water temperature displays E1, EE, 00, 99 or -- or the water point and water temperature soar randomly) The water level soft is off or all on; the water point doesn't drop or drops quickly or rises quickly; the water point light displays up and down, yet doesn't exhibit in the middle) The water point is displayed, but there is no water within the water tank. There is an enormous error between the displayed water temperature and the particular water temperature. 2. How to choose a 2-wires or 4-wires sensor?1) Cut off the sensor signal cable. If there are 2 wires, select a 2-wires sensor; if there are 4 wires, choose a 4-wires sensor) Observe the quick plug of the software sensor. If it's a 4-pin and 4-hole connection, select a 4-wires sensor; if it's a 2-pin and 2-hole connection, prefer a 2-wires sensor) Observe the indoor instrument. If the software sensor has entirely 2 screw interfaces, then it might fully be connected to a 2-wires sensor; if the instrument sensor has 4 screw interfaces, then it's a 2-wires and 4-wires general-purpose instrument, please persist with the original selection. 3. How to do the wiring?Adjust the switch to the 2-wires position, and attach the signal wires to "red" and "yellow" in line with the color. If the demonstrate is abnormal, change the wiring positions.