When the outer barrel is filled with water, since the connection between the outer barrel and the temperature is in a sealed state, the pressure in the air pipe gradually increases as the water level rises, and the pressure in the air pipe generates a thrust on the film in the switch through the temperature air nozzle. When the force reaches the set mark, the thimble connected to the film pushes the contact strip to deform, so that the contact is pulled in and the water level is controlled. That is, under the action of air pressure, the shrapnel contacts the computer board and sends a signal to enter the washing state. At this point, the temperature task is completed. If the water level drops during the washing process, the shrapnel is disconnected and sends a signal to the computer board to replenish water to the set water level.
If the airtightness is not good, the pressure in the trachea will deviate from the actual requirements (small), resulting in a high actual water level. When the user selects the highest water level, the injected water will be too high. If the edge overflows, there will be more than water ingress failure; if the temperature shrapnel cannot be reset after being pushed up, it will cause a non-dehydration failure.
The temperature is 24VDC power supply, one relay switch output is active (24VDC), the lower water level sensor detects that there is no water, the relay switch is closed, and the pump starts to pump water; until the upper water level sensor detects that there is water, the relay switch is disconnected, and the pump stops pumping water.
The liquid level control switch can be equipped with three liquid level sensor probes: FS-IR02, FS-IR12, FS-IR32A, and FS-IR42. The biggest difference between these three sensors is the type of installation.
The surface material of the liquid level sensor is made of PC and polysulfone, which is used for various liquid level measurements. Except for the following liquids, strong acid, strong alkali, and other corrosive liquids cannot be used; such as sulfuric acid, hydrochloric acid, nitric acid, KOH, NaOH, etc.
The liquid level switch adopts advanced circuit design and program optimization, which can eliminate the influence of external factors such as scale, water vapor, and water droplets on the measurement accuracy and accuracy. Of course, you should also pay more attention to maintenance and cleaning.
Learn more about the temperature sensor.
https://www.easybom.com/blog/a/ds18b20-temperature-sensor-circuit-pinout-and-datasheet