Why is the touch delay street lamp on the stairs always on when the weather is wet?

When the weather is wet, the touch delay street lamp on the stairs will always be on for the following reasons:

First of all, wet weather will increase the humidity in the air, so that the sensor surface of the touch-type delay street lamp will also be covered with water vapor. The sensor of touch delay street lamp usually controls the switch of light by sensing the capacitance change of human body. When the surface of the sensor is covered with water vapor, the water vapor will change the capacitance characteristics of the sensor, causing the sensor to misjudge that someone is passing by and keep it on.

Secondly, wet weather can also lead to short circuit or leakage of touch delay street lamps. Humid environment is easy to cause the insulation materials in the circuit to get wet, thus reducing the insulation performance of the circuit and increasing the leakage current. When there is a short circuit or leakage in the circuit, the touch delay street lamp will remain energized all the time, resulting in the lamp always on.

In addition, wet weather may also cause the circuit components of the touch delay street lamp to get wet or corroded, thus affecting the normal operation of the circuit. For example, after the capacitors, resistors and other components in the circuit are wetted, their electrical characteristics may change, resulting in that the touch-type delay street lamp cannot normally sense the capacitance change of the human body, and thus remains on all the time.

Finally, wet weather may also cause the power cord of the touch delay street lamp to be wet or short-circuited, thus affecting the stability of power supply. When the power cord is wet or short-circuited, the power supply can't work normally, resulting in the touch delay street lamp can't work normally, and the lamp is always on.

To sum up, when the weather is wet, the reason why the touch-type delay street lamp on the stairs is always on may be that the sensor is covered with water vapor, the circuit is short-circuited or leaked, the circuit components are wet or corroded, and the power cord is wet or short-circuited. In order to solve this problem, measures can be taken to increase the waterproof performance of sensors, strengthen the insulation protection of circuits, regularly check and maintain circuit components, and ensure the drying of power lines and stable power supply.