LJXH 2 Wires Harpoon Type Water Temperature Water Level Sensor Probe 304 Stainless Steel Solar Water Heater Accessories Specifications:Product Name: 2 Wires SensorWater Level Wire: RedTemperature Wire: YellowSensor Length: 30cmSignal Cable Length: 50cmOperating Voltage: 220VMounting Method: Side-mounting/Top-mountingSensor Material: 304 Food Grade Stainless SteelPackage Contents: 1 x sensor Notices:1. When the following disasters happen to the instrument, it can be that your sensor is broken) The water temperature displays E1, EE, 00, ninety nine or -- or the water level and water temperature jump randomly) The water point mild is off or all on; the water level does not drop or drops quickly or rises quickly; the water point gentle displays up and down, yet doesn't show in the middle) The water level is displayed, but there's no water in the water tank. There is a big error between the displayed water temperature and the particular water temperature. 2. How to determine a 2-wires or 4-wires sensor?1) Cut off the sensor signal cable. If there are 2 wires, want a 2-wires sensor; if there are four wires, choose a 4-wires sensor) Observe the short plug of the software sensor. If it is a 4-pin and 4-hole connection, select a 4-wires sensor; if it's a 2-pin and 2-hole connection, want a 2-wires sensor) Observe the indoor instrument. If the software sensor has only 2 screw interfaces, then it's going to totally be related to a 2-wires sensor; if the instrument sensor has four screw interfaces, then it is a 2-wires and 4-wires general-purpose instrument, please persist with the unique selection. 3. How to do the wiring?Adjust the change to the 2-wires position, and attach the sign wires to "red" and "yellow" in line with the color. If the display is abnormal, switch the wiring positions.