First determine display sensor interface power positive and negative, positive, feedback, negative feedback, signals positive and negative, if it is 6 wire transfer device, measure sensor resistance is the smallest line in the two groups respectively in the power supply is, feedback is; Power negative, negative feedback, after receiving the display of load sensor, measure the voltage value, the other two lines (mv) on display signal is negative answer the display signal negative; Four line value if it is, you need to display the power supply is and feedback are short, power supply and negative feedback negative sub, the sensor is measured with a multimeter four wires, one of the biggest resistance two root is power, the other two are signal. According to the origin of the sensor, can use wire color judgment, the domestic manufacturers for the power supply is generally are red, black for negative, green for the signal is, white for the signal; Europe and the United States generally green production of sensor for the power supply is, black for negative, white as the signal is, red for the signal.