How to do the float water level sensor is unstable?

- Nov 12, 2019-

Normally, the float level detector sensor will be cheaper than other water level detector sensors. However, the float-type water level detector sensor usually has a poor performance, and the floating ball is often stuck and cannot move, and the reliability is low. So how do we solve this problem?


First of all, we must understand the cause of instability. The float-type level detector sensor uses a magnetic float to raise or lower with the liquid level, so that the reed switch chip in the tube generates a pull-in or break-off action, thereby signaling. The instability of the float-type level detector sensor is mainly manifested in the fact that the float ball will be stuck and the detection accuracy will be affected.


It can be seen from the above principle that the float ball type level detector sensor detects the liquid level by the float ball according to the rise and fall of the liquid level, so the float ball is easily stuck when the liquid is thick. When the liquid contains impurities, the floats in the liquid and other particulate impurities may cause the float to become stuck once they enter the gap between the float and the tube. Once the float is stuck and cannot move, the water level cannot be detected normally.


Inside the float is a ring magnet. The magnetic magnet absorbs impurities in the water. After a long time, scale will be generated. The scale will cause the float to gain weight, which will affect the detection accuracy.


The reason why the performance of the float type level detector sensor is unstable is caused by the principle and the structure. This is unavoidable. To solve these problems, other stable water level sensors can be used instead of the float ball. Such as photoelectric level detector sensor.


The photoelectric level detector sensor is a stable and reliable sensor. The photoelectric level detector sensor is composed of a near-infrared light-emitting diode and a photosensitive receiver, and uses the principle of reflection and refraction at the interface of two different media to detect the change of the liquid level.


The light emitted by the LED is directed into the lens at the top of the sensor. When the liquid is immersed in the lens of the photoelectric level switch, the light is refracted into the liquid, so that the receiver does not receive or can only receive a small amount of light. If there is no liquid, the light from the LED is reflected directly from the lens back to the receiver.


From the above, we can see that the detection accuracy of level sensor is not affected by the scale, it has higher liquid level detection accuracy. The photoelectric water level sensor has no friction and mechanical moving parts, it has a high reliability and long service life, and there is no defect that the floating ball is stuck.


Moreover, the photoelectric type level detector sensor installation way is simpler, and the installation time can be saved. The photoelectric level detector sensor can also be installed in multiple directions, and is not limited by the irregular water tank. The floating ball type water level sensor is limited in use in the irregular water tank due to its structural reasons.


Shenzhen EPT Technology Co., Ltd. is a professional sensor manufacturer, mainly supplying liquid level sensor, liquid level switch, dump switch, Hall flow meter, motion switch, tact switch, fish aquarium tank ATO etc.