The electrode level sensor can be eliminated first. The electrode type liquid level sensor generates electrolyte after a long period of use, the electrolytic substance is harmful to the human body. If the electrode type liquid level sensor is used in a water dispenser, one year later, the electrode type liquid level sensor will generate an electrolyte, a yellow object similar to scale, which will reduce the user experience. The following is a small experiment we made. After the salt is added to the water, the electrode type liquid level sensor is accelerated and the electrolyte is finally produced. It can be seen from the water after the test that the water is not drinkable at all, so the electrode type liquid level sensor is not suitable for detecting drinking water.
The float type liquid level sensor is also a common liquid level sensor. The float ball is driven by water, and the magnet inside the float ball drives the internal reed switch to open and close.The float type liquid level sensor is a mechanical product with extremely low reliability and is susceptible to water level and other factors. The float ball is extremely cannot move. Friends who have used the float-type liquid level sensor know that the float-type liquid level sensor is prone to undesirable phenomena and has a short life after a period of use. Not only that, the magnet inside the float ball will absorb the impurities in the water to form scale, and the structure of the float ball liquid level sensor is more complicated, and the part contacting the liquid is large, which is difficult to clean, which greatly affects the user experience. And the scale will cause the float to gain weight, which will affect the detection accuracy, and the accuracy of the float ball level sensor itself is lower, it is about ± 3mm, the tolerance is about 6mm, the accuracy will be worse affected by the scale.
The photoelectric liquid level sensor detects the liquid level by the principle of optical reflection, and converts the liquid level into a high-low level signal output, thereby controlling the high and low liquid levels. The installation method of the photoelectric liquid level sensor is very simple, and it can be directly screwed in or fixed by a direct locking screw, which saves time compared to the floating ball type liquid level sensor. The photoelectric liquid level sensor can be installed up, down, side, and obliquely, and the mounting orientation is not limited.
The internal components of the photoelectric liquid level sensor are processed by photosensitive resin, and there are no moving parts inside, so the reliability is extremely high, the service life is long, and the precision is also extremely high, which can reach ±1mm. The photoelectric liquid level sensor is not affected by scale, temperature, liquid color, corrosiveness, pressure and other factors, and can be applied in a wide range.
From the aspects of food hygiene, installation, liquid level control accuracy and reliability, photoelectric liquid level sensor is very suitable for detecting drinking water, it can be used in electric steamer, water dispenser and water purifier.